StylePropertySanitizer.php
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StylePropertySanitizer.php
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	<?php
	/**
	* @file
	* @license https://opensource.org/licenses/Apache-2.0 Apache-2.0
	*/

	namespace Wikimedia\CSS\Sanitizer;

	use Wikimedia\CSS\Grammar\Alternative;
	use Wikimedia\CSS\Grammar\BlockMatcher;
	use Wikimedia\CSS\Grammar\DelimMatcher;
	use Wikimedia\CSS\Grammar\FunctionMatcher;
	use Wikimedia\CSS\Grammar\Juxtaposition;
	use Wikimedia\CSS\Grammar\KeywordMatcher;
	use Wikimedia\CSS\Grammar\Matcher;
	use Wikimedia\CSS\Grammar\MatcherFactory;
	use Wikimedia\CSS\Grammar\Quantifier;
	use Wikimedia\CSS\Grammar\TokenMatcher;
	use Wikimedia\CSS\Grammar\UnorderedGroup;
	use Wikimedia\CSS\Objects\Token;

	/**
	* Sanitizes a Declaration representing a CSS style property
	* @note This intentionally doesn't support
	* [cascading variables](https://www.w3.org/TR/css-variables/) since that
	* seems impossible to securely sanitize.
	*/
	class StylePropertySanitizer extends PropertySanitizer {

	/** @var mixed[] */
	protected $cache = [];

	/**
	* @param MatcherFactory $matcherFactory Factory for Matchers
	*/
	public function __construct( MatcherFactory $matcherFactory ) {
	parent::__construct( [], $matcherFactory->cssWideKeywords() );

	$this->addKnownProperties( [
	// https://www.w3.org/TR/2018/CR-css-cascade-4-20180828/#all-shorthand
	'all' => $matcherFactory->cssWideKeywords(),

	// https://www.w3.org/TR/2019/REC-pointerevents2-20190404/#the-touch-action-css-property
	'touch-action' => new Alternative( [
	new KeywordMatcher( [ 'auto', 'none', 'manipulation' ] ),
	UnorderedGroup::someOf( [
	new KeywordMatcher( 'pan-x' ),
	new KeywordMatcher( 'pan-y' ),
	] ),
	] ),

	// https://www.w3.org/TR/2018/WD-css-page-3-20181018/#using-named-pages
	'page' => $matcherFactory->ident(),
	] );
	$this->addKnownProperties( $this->css2( $matcherFactory ) );
	$this->addKnownProperties( $this->cssDisplay3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssPosition3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssColor3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssBorderBackground3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssImages3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssFonts3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssMulticol( $matcherFactory ) );
	$this->addKnownProperties( $this->cssOverflow3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssUI4( $matcherFactory ) );
	$this->addKnownProperties( $this->cssCompositing1( $matcherFactory ) );
	$this->addKnownProperties( $this->cssWritingModes4( $matcherFactory ) );
	$this->addKnownProperties( $this->cssTransitions( $matcherFactory ) );
	$this->addKnownProperties( $this->cssAnimations( $matcherFactory ) );
	$this->addKnownProperties( $this->cssFlexbox3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssTransforms1( $matcherFactory ) );
	$this->addKnownProperties( $this->cssText3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssTextDecor3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssAlign3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssBreak3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssGrid1( $matcherFactory ) );
	$this->addKnownProperties( $this->cssFilter1( $matcherFactory ) );
	$this->addKnownProperties( $this->cssShapes1( $matcherFactory ) );
	$this->addKnownProperties( $this->cssMasking1( $matcherFactory ) );
	$this->addKnownProperties( $this->cssSizing3( $matcherFactory ) );
	$this->addKnownProperties( $this->cssLogical1( $matcherFactory ) );
	}

	/**
	* Properties from CSS 2.1
	* @see https://www.w3.org/TR/2011/REC-CSS2-20110607/
	* @note Omits properties that have been replaced by a CSS3 module
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function css2( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];

	$none = new KeywordMatcher( 'none' );
	$auto = new KeywordMatcher( 'auto' );
	$autoLength = new Alternative( [ $auto, $matcherFactory->length() ] );
	$autoLengthPct = new Alternative( [ $auto, $matcherFactory->lengthPercentage() ] );

	// https://www.w3.org/TR/2011/REC-CSS2-20110607/box.html
	$props['margin-top'] = $autoLengthPct;
	$props['margin-bottom'] = $autoLengthPct;
	$props['margin-left'] = $autoLengthPct;
	$props['margin-right'] = $autoLengthPct;
	$props['margin'] = Quantifier::count( $autoLengthPct, 1, 4 );
	$props['padding-top'] = $matcherFactory->lengthPercentage();
	$props['padding-bottom'] = $matcherFactory->lengthPercentage();
	$props['padding-left'] = $matcherFactory->lengthPercentage();
	$props['padding-right'] = $matcherFactory->lengthPercentage();
	$props['padding'] = Quantifier::count( $matcherFactory->lengthPercentage(), 1, 4 );

	// https://www.w3.org/TR/2011/REC-CSS2-20110607/visuren.html
	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#directional-keywords
	$props['float'] = new KeywordMatcher( [ 'left', 'right', 'inline-start', 'inline-end', 'none' ] );
	$props['clear'] = new KeywordMatcher( [ 'none', 'left', 'right', 'both', 'inline-start', 'inline-end' ] );

	// https://www.w3.org/TR/2011/REC-CSS2-20110607/visudet.html
	$props['line-height'] = new Alternative( [
	new KeywordMatcher( 'normal' ),
	$matcherFactory->length(),
	$matcherFactory->numberPercentage(),
	] );
	$props['vertical-align'] = new Alternative( [
	new KeywordMatcher( [
	'baseline', 'sub', 'super', 'top', 'text-top', 'middle', 'bottom', 'text-bottom'
	] ),
	$matcherFactory->lengthPercentage(),
	] );

	// https://www.w3.org/TR/2011/REC-CSS2-20110607/visufx.html
	$props['clip'] = new Alternative( [
	$auto, new FunctionMatcher( 'rect', Quantifier::hash( $autoLength, 4, 4 ) ),
	] );
	$props['visibility'] = new KeywordMatcher( [ 'visible', 'hidden', 'collapse' ] );

	// https://www.w3.org/TR/2011/REC-CSS2-20110607/generate.html
	$props['list-style-type'] = new KeywordMatcher( [
	'disc', 'circle', 'square', 'decimal', 'decimal-leading-zero', 'lower-roman', 'upper-roman',
	'lower-greek', 'lower-latin', 'upper-latin', 'armenian', 'georgian', 'lower-alpha',
	'upper-alpha', 'none'
	] );
	$props['content'] = new Alternative( [
	new KeywordMatcher( [ 'normal', 'none' ] ),
	Quantifier::plus( new Alternative( [
	$matcherFactory->string(),
	// Replaces <url> per https://www.w3.org/TR/css-images-3/#placement
	$matcherFactory->image(),
	new FunctionMatcher( 'counter', new Juxtaposition( [
	$matcherFactory->ident(),
	Quantifier::optional( $props['list-style-type'] ),
	], true ) ),
	new FunctionMatcher( 'counters', new Juxtaposition( [
	$matcherFactory->ident(),
	$matcherFactory->string(),
	Quantifier::optional( $props['list-style-type'] ),
	], true ) ),
	new FunctionMatcher( 'attr', $matcherFactory->ident() ),
	new KeywordMatcher( [ 'open-quote', 'close-quote', 'no-open-quote', 'no-close-quote' ] ),
	] ) )
	] );
	$props['quotes'] = new Alternative( [
	$none, Quantifier::plus( new Juxtaposition( [
	$matcherFactory->string(), $matcherFactory->string()
	] ) ),
	] );
	$props['counter-reset'] = new Alternative( [
	$none,
	Quantifier::plus( new Juxtaposition( [
	$matcherFactory->ident(), Quantifier::optional( $matcherFactory->integer() )
	] ) ),
	] );
	$props['counter-increment'] = $props['counter-reset'];
	$props['list-style-image'] = new Alternative( [
	$none,
	// Replaces <url> per https://www.w3.org/TR/css-images-3/#placement
	$matcherFactory->image()
	] );
	$props['list-style-position'] = new KeywordMatcher( [ 'inside', 'outside' ] );
	$props['list-style'] = UnorderedGroup::someOf( [
	$props['list-style-type'], $props['list-style-position'], $props['list-style-image']
	] );

	// https://www.w3.org/TR/2011/REC-CSS2-20110607/tables.html
	$props['caption-side'] = new KeywordMatcher( [ 'top', 'bottom' ] );
	$props['table-layout'] = new KeywordMatcher( [ 'auto', 'fixed' ] );
	$props['border-collapse'] = new KeywordMatcher( [ 'collapse', 'separate' ] );
	$props['border-spacing'] = Quantifier::count( $matcherFactory->length(), 1, 2 );
	$props['empty-cells'] = new KeywordMatcher( [ 'show', 'hide' ] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Display Module Level 3
	* @see https://www.w3.org/TR/2019/CR-css-display-3-20190711/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssDisplay3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];

	$displayOutside = new KeywordMatcher( [ 'block', 'inline', 'run-in' ] );

	$props['display'] = new Alternative( [
	// <display-outside> \|\| <display-inside>
	UnorderedGroup::someOf( [
	$displayOutside,
	new KeywordMatcher( [ 'flow', 'flow-root', 'table', 'flex', 'grid', 'ruby' ] ),
	] ),
	// <display-listitem>
	UnorderedGroup::allOf( [
	Quantifier::optional( $displayOutside ),
	Quantifier::optional( new KeywordMatcher( [ 'flow', 'flow-root' ] ) ),
	new KeywordMatcher( 'list-item' ),
	] ),
	new KeywordMatcher( [
	// <display-internal>
	'table-row-group', 'table-header-group', 'table-footer-group', 'table-row', 'table-cell',
	'table-column-group', 'table-column', 'table-caption', 'ruby-base', 'ruby-text',
	'ruby-base-container', 'ruby-text-container',
	// <display-box>
	'contents', 'none',
	// <display-legacy>
	'inline-block', 'inline-table', 'inline-flex', 'inline-grid',
	] ),
	] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Positioned Layout Module Level 3
	* @see https://www.w3.org/TR/2016/WD-css-position-3-20160517/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssPosition3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$auto = new KeywordMatcher( 'auto' );
	$autoLengthPct = new Alternative( [ $auto, $matcherFactory->lengthPercentage() ] );

	$props = [];

	$props['position'] = new KeywordMatcher( [
	'static', 'relative', 'absolute', 'sticky', 'fixed'
	] );
	$props['top'] = $autoLengthPct;
	$props['right'] = $autoLengthPct;
	$props['bottom'] = $autoLengthPct;
	$props['left'] = $autoLengthPct;
	$props['offset-before'] = $autoLengthPct;
	$props['offset-after'] = $autoLengthPct;
	$props['offset-start'] = $autoLengthPct;
	$props['offset-end'] = $autoLengthPct;
	$props['z-index'] = new Alternative( [ $auto, $matcherFactory->integer() ] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Color Module Level 3
	* @see https://www.w3.org/TR/2018/REC-css-color-3-20180619/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssColor3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];
	$props['color'] = $matcherFactory->color();
	$props['opacity'] = $matcherFactory->number();

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Data types for backgrounds
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return array
	*/
	protected function backgroundTypes( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$types = [];

	$types['bgrepeat'] = new Alternative( [
	new KeywordMatcher( [ 'repeat-x', 'repeat-y' ] ),
	Quantifier::count( new KeywordMatcher( [ 'repeat', 'space', 'round', 'no-repeat' ] ), 1, 2 ),
	] );
	$types['bgsize'] = new Alternative( [
	Quantifier::count( new Alternative( [
	$matcherFactory->lengthPercentage(),
	new KeywordMatcher( 'auto' )
	] ), 1, 2 ),
	new KeywordMatcher( [ 'cover', 'contain' ] )
	] );
	$types['boxKeywords'] = [ 'border-box', 'padding-box', 'content-box' ];

	$this->cache[__METHOD__] = $types;
	return $types;
	}

	/**
	* Properties for CSS Backgrounds and Borders Module Level 3
	* @see https://www.w3.org/TR/2017/CR-css-backgrounds-3-20171017/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssBorderBackground3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];

	$types = $this->backgroundTypes( $matcherFactory );
	$slash = new DelimMatcher( '/' );
	$bgimage = new Alternative( [ new KeywordMatcher( 'none' ), $matcherFactory->image() ] );
	$bgrepeat = $types['bgrepeat'];
	$bgattach = new KeywordMatcher( [ 'scroll', 'fixed', 'local' ] );
	$position = $matcherFactory->bgPosition();
	$box = new KeywordMatcher( $types['boxKeywords'] );
	$bgsize = $types['bgsize'];
	$bglayer = UnorderedGroup::someOf( [
	$bgimage,
	new Juxtaposition( [
	$position, Quantifier::optional( new Juxtaposition( [ $slash, $bgsize ] ) )
	] ),
	$bgrepeat,
	$bgattach,
	$box,
	$box,
	] );
	$finalBglayer = UnorderedGroup::someOf( [
	$matcherFactory->color(),
	$bgimage,
	new Juxtaposition( [
	$position, Quantifier::optional( new Juxtaposition( [ $slash, $bgsize ] ) )
	] ),
	$bgrepeat,
	$bgattach,
	$box,
	$box,
	] );

	$props['background-color'] = $matcherFactory->color();
	$props['background-image'] = Quantifier::hash( $bgimage );
	$props['background-repeat'] = Quantifier::hash( $bgrepeat );
	$props['background-attachment'] = Quantifier::hash( $bgattach );
	$props['background-position'] = Quantifier::hash( $position );
	$props['background-clip'] = Quantifier::hash( $box );
	$props['background-origin'] = $props['background-clip'];
	$props['background-size'] = Quantifier::hash( $bgsize );
	$props['background'] = new Juxtaposition(
	[ Quantifier::hash( $bglayer, 0, INF ), $finalBglayer ], true
	);

	$lineStyle = new KeywordMatcher( [
	'none', 'hidden', 'dotted', 'dashed', 'solid', 'double', 'groove', 'ridge', 'inset', 'outset'
	] );
	$lineWidth = new Alternative( [
	new KeywordMatcher( [ 'thin', 'medium', 'thick' ] ), $matcherFactory->length(),
	] );
	$borderCombo = UnorderedGroup::someOf( [ $lineWidth, $lineStyle, $matcherFactory->color() ] );
	$radius = Quantifier::count( $matcherFactory->lengthPercentage(), 1, 2 );
	$radius4 = Quantifier::count( $matcherFactory->lengthPercentage(), 1, 4 );

	$props['border-top-color'] = $matcherFactory->color();
	$props['border-right-color'] = $matcherFactory->color();
	$props['border-bottom-color'] = $matcherFactory->color();
	$props['border-left-color'] = $matcherFactory->color();
	// Because this property allows concatenation of color values, don't
	// allow var(...) expressions here out of an abundance of caution.
	$props['border-color'] = Quantifier::count( $matcherFactory->safeColor(), 1, 4 );
	$props['border-top-style'] = $lineStyle;
	$props['border-right-style'] = $lineStyle;
	$props['border-bottom-style'] = $lineStyle;
	$props['border-left-style'] = $lineStyle;
	$props['border-style'] = Quantifier::count( $lineStyle, 1, 4 );
	$props['border-top-width'] = $lineWidth;
	$props['border-right-width'] = $lineWidth;
	$props['border-bottom-width'] = $lineWidth;
	$props['border-left-width'] = $lineWidth;
	$props['border-width'] = Quantifier::count( $lineWidth, 1, 4 );
	$props['border-top'] = $borderCombo;
	$props['border-right'] = $borderCombo;
	$props['border-bottom'] = $borderCombo;
	$props['border-left'] = $borderCombo;
	$props['border'] = $borderCombo;
	$props['border-top-left-radius'] = $radius;
	$props['border-top-right-radius'] = $radius;
	$props['border-bottom-left-radius'] = $radius;
	$props['border-bottom-right-radius'] = $radius;
	$props['border-radius'] = new Juxtaposition( [
	$radius4, Quantifier::optional( new Juxtaposition( [ $slash, $radius4 ] ) )
	] );
	$props['border-image-source'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	$matcherFactory->image()
	] );
	$props['border-image-slice'] = UnorderedGroup::allOf( [
	Quantifier::count( $matcherFactory->numberPercentage(), 1, 4 ),
	Quantifier::optional( new KeywordMatcher( 'fill' ) ),
	] );
	$props['border-image-width'] = Quantifier::count( new Alternative( [
	$matcherFactory->length(),
	$matcherFactory->percentage(),
	$matcherFactory->number(),
	new KeywordMatcher( 'auto' ),
	] ), 1, 4 );
	$props['border-image-outset'] = Quantifier::count( new Alternative( [
	$matcherFactory->length(),
	$matcherFactory->number(),
	] ), 1, 4 );
	$props['border-image-repeat'] = Quantifier::count( new KeywordMatcher( [
	'stretch', 'repeat', 'round', 'space'
	] ), 1, 2 );
	$props['border-image'] = UnorderedGroup::someOf( [
	$props['border-image-source'],
	new Juxtaposition( [
	$props['border-image-slice'],
	Quantifier::optional( new Alternative( [
	new Juxtaposition( [ $slash, $props['border-image-width'] ] ),
	new Juxtaposition( [
	$slash,
	Quantifier::optional( $props['border-image-width'] ),
	$slash,
	$props['border-image-outset']
	] )
	] ) )
	] ),
	$props['border-image-repeat']
	] );

	$props['box-shadow'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	Quantifier::hash( UnorderedGroup::allOf( [
	Quantifier::optional( new KeywordMatcher( 'inset' ) ),
	Quantifier::count( $matcherFactory->length(), 2, 4 ),
	Quantifier::optional( $matcherFactory->color() ),
	] ) )
	] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Images Module Level 3
	* @see https://www.w3.org/TR/2019/CR-css-images-3-20191010/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssImages3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];

	$props['object-fit'] = new KeywordMatcher( [ 'fill', 'contain', 'cover', 'none', 'scale-down' ] );
	$props['object-position'] = $matcherFactory->position();

	// Not documented as allowing bare 0, but predates the redefinition of <angle> so let's
	// be conservative
	$a = new Alternative( [
	$matcherFactory->zero(),
	$matcherFactory->angle(),
	] );
	$props['image-orientation'] = new Alternative( [
	new KeywordMatcher( [ 'from-image', 'none', 'flip' ] ),
	$a,
	new Juxtaposition( [
	$a,
	new KeywordMatcher( [ 'flip' ] ),
	] ),
	] );

	$props['image-rendering'] = new KeywordMatcher( [
	'auto', 'smooth', 'high-quality', 'crisp-edges', 'pixelated'
	] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Fonts Module Level 3
	* @see https://www.w3.org/TR/2018/REC-css-fonts-3-20180920/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssFonts3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$css2 = $this->css2( $matcherFactory );
	$props = [];

	$matchData = FontFaceAtRuleSanitizer::fontMatchData( $matcherFactory );

	// Note: <generic-family> is syntactically a subset of <family-name>,
	// so no point in separately listing it.
	$props['font-family'] = Quantifier::hash( $matchData['familyName'] );
	$props['font-weight'] = new Alternative( [
	new KeywordMatcher( [ 'normal', 'bold', 'bolder', 'lighter' ] ),
	$matchData['numWeight'],
	] );
	$props['font-stretch'] = $matchData['font-stretch'];
	$props['font-style'] = $matchData['font-style'];
	$props['font-size'] = new Alternative( [
	new KeywordMatcher( [
	'xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large', 'larger', 'smaller'
	] ),
	$matcherFactory->lengthPercentage(),
	] );
	$props['font-size-adjust'] = new Alternative( [
	new KeywordMatcher( 'none' ), $matcherFactory->number()
	] );
	$props['font'] = new Alternative( [
	new Juxtaposition( [
	Quantifier::optional( UnorderedGroup::someOf( [
	$props['font-style'],
	new KeywordMatcher( [ 'normal', 'small-caps' ] ),
	$props['font-weight'],
	$props['font-stretch'],
	] ) ),
	$props['font-size'],
	Quantifier::optional( new Juxtaposition( [
	new DelimMatcher( '/' ),
	$css2['line-height'],
	] ) ),
	$props['font-family'],
	] ),
	new KeywordMatcher( [ 'caption', 'icon', 'menu', 'message-box', 'small-caption', 'status-bar' ] )
	] );
	$props['font-synthesis'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	UnorderedGroup::someOf( [
	new KeywordMatcher( 'weight' ),
	new KeywordMatcher( 'style' ),
	] )
	] );
	$props['font-kerning'] = new KeywordMatcher( [ 'auto', 'normal', 'none' ] );
	$props['font-variant-ligatures'] = new Alternative( [
	new KeywordMatcher( [ 'normal', 'none' ] ),
	UnorderedGroup::someOf( $matchData['ligatures'] )
	] );
	$props['font-variant-position'] = new KeywordMatcher(
	array_merge( [ 'normal' ], $matchData['positionKeywords'] )
	);
	$props['font-variant-caps'] = new KeywordMatcher(
	array_merge( [ 'normal' ], $matchData['capsKeywords'] )
	);
	$props['font-variant-numeric'] = new Alternative( [
	new KeywordMatcher( 'normal' ),
	UnorderedGroup::someOf( $matchData['numeric'] )
	] );
	$props['font-variant-east-asian'] = new Alternative( [
	new KeywordMatcher( 'normal' ),
	UnorderedGroup::someOf( $matchData['eastAsian'] )
	] );
	$props['font-variant'] = $matchData['font-variant'];
	$props['font-feature-settings'] = $matchData['font-feature-settings'];

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Multi-column Layout Module
	* @see https://www.w3.org/TR/2019/WD-css-multicol-1-20191015/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssMulticol( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$borders = $this->cssBorderBackground3( $matcherFactory );
	$props = [];

	$auto = new KeywordMatcher( 'auto' );

	$props['column-width'] = new Alternative( array_merge(
	[ $matcherFactory->length(), $auto ],
	// Additional values from https://www.w3.org/TR/2019/WD-css-sizing-3-20190522/
	$this->getSizingAdditions( $matcherFactory )
	) );
	$props['column-count'] = new Alternative( [ $matcherFactory->integer(), $auto ] );
	$props['columns'] = UnorderedGroup::someOf( [ $props['column-width'], $props['column-count'] ] );
	// Copy these from similar items in the Border module
	$props['column-rule-color'] = $borders['border-right-color'];
	$props['column-rule-style'] = $borders['border-right-style'];
	$props['column-rule-width'] = $borders['border-right-width'];
	$props['column-rule'] = $borders['border-right'];
	$props['column-span'] = new KeywordMatcher( [ 'none', 'all' ] );
	$props['column-fill'] = new KeywordMatcher( [ 'auto', 'balance', 'balance-all' ] );

	// Copy these from cssBreak3(), the duplication is allowed as long as
	// they're the identical Matcher object.
	$breaks = $this->cssBreak3( $matcherFactory );
	$props['break-before'] = $breaks['break-before'];
	$props['break-after'] = $breaks['break-after'];
	$props['break-inside'] = $breaks['break-inside'];

	// And one from cssAlign3
	$props['column-gap'] = $this->cssAlign3( $matcherFactory )['column-gap'];

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Overflow Module Level 3
	* @see https://www.w3.org/TR/2018/WD-css-overflow-3-20180731/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssOverflow3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];

	$overflow = new KeywordMatcher( [ 'visible', 'hidden', 'clip', 'scroll', 'auto' ] );
	$props['overflow'] = Quantifier::count( $overflow, 1, 2 );
	$props['overflow-x'] = $overflow;
	$props['overflow-y'] = $overflow;
	$props['overflow-inline'] = $overflow;
	$props['overflow-block'] = $overflow;

	$props['text-overflow'] = new KeywordMatcher( [ 'clip', 'ellipsis' ] );
	$props['block-overflow'] = new Alternative( [
	new KeywordMatcher( [ 'clip', 'ellipsis' ] ),
	$matcherFactory->string(),
	] );

	$props['line-clamp'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	new Juxtaposition( [
	$matcherFactory->integer(),
	Quantifier::optional( $props['block-overflow'] ),
	] ),
	] );
	$props['max-lines'] = new Alternative( [
	new KeywordMatcher( 'none' ), $matcherFactory->integer()
	] );
	$props['continue'] = new KeywordMatcher( [ 'auto', 'discard' ] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Basic User Interface Module Level 4
	* @see https://www.w3.org/TR/2018/REC-css-ui-3-20180621/
	* @see https://www.w3.org/TR/2020/WD-css-ui-4-20200102/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssUI4( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$border = $this->cssBorderBackground3( $matcherFactory );
	$props = [];

	// Copy these from similar border properties
	$props['outline-width'] = $border['border-top-width'];
	$props['outline-style'] = new Alternative( [
	new KeywordMatcher( 'auto' ), $border['border-top-style']
	] );
	$props['outline-color'] = new Alternative( [
	new KeywordMatcher( 'invert' ), $matcherFactory->color()
	] );
	$props['outline'] = UnorderedGroup::someOf( [
	$props['outline-width'], $props['outline-style'], $props['outline-color']
	] );
	$props['outline-offset'] = $matcherFactory->length();
	$props['resize'] = new KeywordMatcher( [ 'none', 'both', 'horizontal', 'vertical' ] );
	$props['cursor'] = new Juxtaposition( [
	Quantifier::star( new Juxtaposition( [
	$matcherFactory->image(),
	Quantifier::optional( new Juxtaposition( [
	$matcherFactory->number(), $matcherFactory->number()
	] ) ),
	$matcherFactory->comma(),
	] ) ),
	new KeywordMatcher( [
	'auto', 'default', 'none', 'context-menu', 'help', 'pointer', 'progress', 'wait', 'cell',
	'crosshair', 'text', 'vertical-text', 'alias', 'copy', 'move', 'no-drop', 'not-allowed', 'grab',
	'grabbing', 'e-resize', 'n-resize', 'ne-resize', 'nw-resize', 's-resize', 'se-resize',
	'sw-resize', 'w-resize', 'ew-resize', 'ns-resize', 'nesw-resize', 'nwse-resize', 'col-resize',
	'row-resize', 'all-scroll', 'zoom-in', 'zoom-out',
	] ),
	] );
	$props['caret-color'] = new Alternative( [
	new KeywordMatcher( 'auto' ), $matcherFactory->color()
	] );
	$props['caret-shape'] = new KeywordMatcher( [ 'auto', 'bar', 'block', 'underscore' ] );
	$props['caret'] = UnorderedGroup::someOf( [ $props['caret-color'], $props['caret-shape'] ] );
	$props['nav-up'] = new Alternative( [
	new KeywordMatcher( 'auto' ),
	new Juxtaposition( [
	$matcherFactory->cssID(),
	Quantifier::optional( new Alternative( [
	new KeywordMatcher( [ 'current', 'root' ] ),
	$matcherFactory->string(),
	] ) )
	] )
	] );
	$props['nav-right'] = $props['nav-up'];
	$props['nav-down'] = $props['nav-up'];
	$props['nav-left'] = $props['nav-up'];

	$props['user-select'] = new KeywordMatcher( [ 'auto', 'text', 'none', 'contain', 'all' ] );
	// Seems potentially useful enough to let the prefixed versions work.
	$props['-moz-user-select'] = $props['user-select'];
	$props['-ms-user-select'] = $props['user-select'];
	$props['-webkit-user-select'] = $props['user-select'];

	$props['appearance'] = new KeywordMatcher( [
	'none', 'auto', 'button', 'textfield', 'menulist-button',
	] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Compositing and Blending Level 1
	* @see https://www.w3.org/TR/2015/CR-compositing-1-20150113/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssCompositing1( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];

	$props['mix-blend-mode'] = new KeywordMatcher( [
	'normal', 'multiply', 'screen', 'overlay', 'darken', 'lighten', 'color-dodge', 'color-burn',
	'hard-light', 'soft-light', 'difference', 'exclusion', 'hue', 'saturation', 'color', 'luminosity'
	] );
	$props['isolation'] = new KeywordMatcher( [ 'auto', 'isolate' ] );

	// The linked spec incorrectly has this without the hash, despite the
	// textual description and examples showing it as such. The draft has it fixed.
	$props['background-blend-mode'] = Quantifier::hash( $props['mix-blend-mode'] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Writing Modes Level 4
	* @see https://www.w3.org/TR/2019/CR-css-writing-modes-4-20190730/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssWritingModes4( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];

	$props['direction'] = new KeywordMatcher( [ 'ltr', 'rtl' ] );
	$props['unicode-bidi'] = new KeywordMatcher( [
	'normal', 'embed', 'isolate', 'bidi-override', 'isolate-override', 'plaintext'
	] );
	$props['writing-mode'] = new KeywordMatcher( [
	'horizontal-tb', 'vertical-rl', 'vertical-lr', 'sideways-rl', 'sideways-lr',
	] );
	$props['text-orientation'] = new KeywordMatcher( [ 'mixed', 'upright', 'sideways' ] );
	$props['text-combine-upright'] = new Alternative( [
	new KeywordMatcher( [ 'none', 'all' ] ),
	new Juxtaposition( [
	new KeywordMatcher( [ 'digits' ] ),
	Quantifier::optional( $matcherFactory->integer() ),
	] ),
	] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Transitions
	* @see https://www.w3.org/TR/2018/WD-css-transitions-1-20181011/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssTransitions( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];
	$property = new Alternative( [
	new KeywordMatcher( [ 'all' ] ),
	$matcherFactory->customIdent( [ 'none' ] ),
	] );
	$none = new KeywordMatcher( 'none' );
	$singleEasingFunction = $matcherFactory->cssSingleEasingFunction();

	$props['transition-property'] = new Alternative( [
	$none, Quantifier::hash( $property )
	] );
	$props['transition-duration'] = Quantifier::hash( $matcherFactory->time() );
	$props['transition-timing-function'] = Quantifier::hash( $singleEasingFunction );
	$props['transition-delay'] = Quantifier::hash( $matcherFactory->time() );
	$props['transition'] = Quantifier::hash( UnorderedGroup::someOf( [
	new Alternative( [ $none, $property ] ),
	$matcherFactory->time(),
	$singleEasingFunction,
	$matcherFactory->time(),
	] ) );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Animations
	* @see https://www.w3.org/TR/2018/WD-css-animations-1-20181011/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssAnimations( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];
	$name = new Alternative( [
	new KeywordMatcher( [ 'none' ] ),
	$matcherFactory->customIdent( [ 'none' ] ),
	$matcherFactory->string(),
	] );
	$singleEasingFunction = $matcherFactory->cssSingleEasingFunction();
	$count = new Alternative( [
	new KeywordMatcher( 'infinite' ),
	$matcherFactory->number()
	] );
	$direction = new KeywordMatcher( [ 'normal', 'reverse', 'alternate', 'alternate-reverse' ] );
	$playState = new KeywordMatcher( [ 'running', 'paused' ] );
	$fillMode = new KeywordMatcher( [ 'none', 'forwards', 'backwards', 'both' ] );

	$props['animation-name'] = Quantifier::hash( $name );
	$props['animation-duration'] = Quantifier::hash( $matcherFactory->time() );
	$props['animation-timing-function'] = Quantifier::hash( $singleEasingFunction );
	$props['animation-iteration-count'] = Quantifier::hash( $count );
	$props['animation-direction'] = Quantifier::hash( $direction );
	$props['animation-play-state'] = Quantifier::hash( $playState );
	$props['animation-delay'] = Quantifier::hash( $matcherFactory->time() );
	$props['animation-fill-mode'] = Quantifier::hash( $fillMode );
	$props['animation'] = Quantifier::hash( UnorderedGroup::someOf( [
	$matcherFactory->time(),
	$singleEasingFunction,
	$matcherFactory->time(),
	$count,
	$direction,
	$fillMode,
	$playState,
	$name,
	] ) );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Flexible Box Layout Module Level 1
	* @see https://www.w3.org/TR/2018/CR-css-flexbox-1-20181119/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssFlexbox3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];
	$props['flex-direction'] = new KeywordMatcher( [
	'row', 'row-reverse', 'column', 'column-reverse'
	] );
	$props['flex-wrap'] = new KeywordMatcher( [ 'nowrap', 'wrap', 'wrap-reverse' ] );
	$props['flex-flow'] = UnorderedGroup::someOf( [ $props['flex-direction'], $props['flex-wrap'] ] );
	$props['order'] = $matcherFactory->integer();
	$props['flex-grow'] = $matcherFactory->number();
	$props['flex-shrink'] = $matcherFactory->number();
	$props['flex-basis'] = new Alternative( [
	new KeywordMatcher( [ 'content' ] ),
	$this->cssSizing3( $matcherFactory )['width']
	] );
	$props['flex'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	UnorderedGroup::someOf( [
	new Juxtaposition( [ $props['flex-grow'], Quantifier::optional( $props['flex-shrink'] ) ] ),
	$props['flex-basis'],
	] )
	] );

	// The alignment module supersedes the ones in flexbox. Copying is ok as long as
	// it's the identical object.
	$align = $this->cssAlign3( $matcherFactory );
	$props['justify-content'] = $align['justify-content'];
	$props['align-items'] = $align['align-items'];
	$props['align-self'] = $align['align-self'];
	$props['align-content'] = $align['align-content'];

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Transforms Module Level 1
	*
	* @see https://www.w3.org/TR/2019/CR-css-transforms-1-20190214/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssTransforms1( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];
	$a = $matcherFactory->angle();
	$az = new Alternative( [
	$matcherFactory->zero(),
	$a,
	] );
	$n = $matcherFactory->number();
	$l = $matcherFactory->length();
	$ol = Quantifier::optional( $l );
	$lp = $matcherFactory->lengthPercentage();
	$center = new KeywordMatcher( 'center' );
	$leftRight = new KeywordMatcher( [ 'left', 'right' ] );
	$topBottom = new KeywordMatcher( [ 'top', 'bottom' ] );

	$props['transform'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	Quantifier::plus( new Alternative( [
	new FunctionMatcher( 'matrix', Quantifier::hash( $n, 6, 6 ) ),
	new FunctionMatcher( 'translate', Quantifier::hash( $lp, 1, 2 ) ),
	new FunctionMatcher( 'translateX', $lp ),
	new FunctionMatcher( 'translateY', $lp ),
	new FunctionMatcher( 'scale', Quantifier::hash( $n, 1, 2 ) ),
	new FunctionMatcher( 'scaleX', $n ),
	new FunctionMatcher( 'scaleY', $n ),
	new FunctionMatcher( 'rotate', $az ),
	new FunctionMatcher( 'skew', Quantifier::hash( $az, 1, 2 ) ),
	new FunctionMatcher( 'skewX', $az ),
	new FunctionMatcher( 'skewY', $az ),
	] ) )
	] );

	$props['transform-origin'] = new Alternative( [
	new Alternative( [ $center, $leftRight, $topBottom, $lp ] ),
	new Juxtaposition( [
	new Alternative( [ $center, $leftRight, $lp ] ),
	new Alternative( [ $center, $topBottom, $lp ] ),
	$ol
	] ),
	new Juxtaposition( [
	UnorderedGroup::allOf( [
	new Alternative( [ $center, $leftRight ] ),
	new Alternative( [ $center, $topBottom ] ),
	] ),
	$ol,
	] )
	] );
	$props['transform-box'] = new KeywordMatcher( [
	'content-box', 'border-box', 'fill-box', 'stroke-box', 'view-box'
	] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Text Module Level 3
	* @see https://www.w3.org/TR/2019/WD-css-text-3-20191113/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssText3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];

	$props['text-transform'] = new Alternative( [
	new KeywordMatcher( [ 'none' ] ),
	UnorderedGroup::someOf( [
	new KeywordMatcher( [ 'capitalize', 'uppercase', 'lowercase', 'full-width' ] ),
	new KeywordMatcher( [ 'full-width' ] ),
	new KeywordMatcher( [ 'full-size-kana' ] ),
	] ),
	] );
	$props['white-space'] = new KeywordMatcher( [
	'normal', 'pre', 'nowrap', 'pre-wrap', 'break-spaces', 'pre-line'
	] );
	$props['tab-size'] = new Alternative( [ $matcherFactory->number(), $matcherFactory->length() ] );
	$props['line-break'] = new KeywordMatcher( [ 'auto', 'loose', 'normal', 'strict', 'anywhere' ] );
	$props['word-break'] = new KeywordMatcher( [ 'normal', 'keep-all', 'break-all', 'break-word' ] );
	$props['hyphens'] = new KeywordMatcher( [ 'none', 'manual', 'auto' ] );
	$props['word-wrap'] = new KeywordMatcher( [ 'normal', 'break-word', 'anywhere' ] );
	$props['overflow-wrap'] = $props['word-wrap'];
	$props['text-align'] = new KeywordMatcher( [
	'start', 'end', 'left', 'right', 'center', 'justify', 'match-parent', 'justify-all'
	] );
	$props['text-align-all'] = new KeywordMatcher( [
	'start', 'end', 'left', 'right', 'center', 'justify', 'match-parent'
	] );
	$props['text-align-last'] = new KeywordMatcher( [
	'auto', 'start', 'end', 'left', 'right', 'center', 'justify', 'match-parent'
	] );
	$props['text-justify'] = new KeywordMatcher( [
	'auto', 'none', 'inter-word', 'inter-character'
	] );
	$props['word-spacing'] = new Alternative( [
	new KeywordMatcher( 'normal' ),
	$matcherFactory->length()
	] );
	$props['letter-spacing'] = new Alternative( [
	new KeywordMatcher( 'normal' ),
	$matcherFactory->length()
	] );
	$props['text-indent'] = UnorderedGroup::allOf( [
	$matcherFactory->lengthPercentage(),
	Quantifier::optional( new KeywordMatcher( 'hanging' ) ),
	Quantifier::optional( new KeywordMatcher( 'each-line' ) ),
	] );
	$props['hanging-punctuation'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	UnorderedGroup::someOf( [
	new KeywordMatcher( 'first' ),
	new KeywordMatcher( [ 'force-end', 'allow-end' ] ),
	new KeywordMatcher( 'last' ),
	] )
	] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Text Decoration Module Level 3
	* @see https://www.w3.org/TR/2019/CR-css-text-decor-3-20190813/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssTextDecor3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];

	$props['text-decoration-line'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	UnorderedGroup::someOf( [
	new KeywordMatcher( 'underline' ),
	new KeywordMatcher( 'overline' ),
	new KeywordMatcher( 'line-through' ),
	// new KeywordMatcher( 'blink' ), // NOOO!!!
	] )
	] );
	$props['text-decoration-color'] = $matcherFactory->color();
	$props['text-decoration-style'] = new KeywordMatcher( [
	'solid', 'double', 'dotted', 'dashed', 'wavy'
	] );
	$props['text-decoration'] = UnorderedGroup::someOf( [
	$props['text-decoration-line'],
	$props['text-decoration-style'],
	$props['text-decoration-color'],
	] );
	$props['text-underline-position'] = new Alternative( [
	new KeywordMatcher( 'auto' ),
	UnorderedGroup::someOf( [
	new KeywordMatcher( 'under' ),
	new KeywordMatcher( [ 'left', 'right' ] ),
	] )
	] );
	$props['text-emphasis-style'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	UnorderedGroup::someOf( [
	new KeywordMatcher( [ 'filled', 'open' ] ),
	new KeywordMatcher( [ 'dot', 'circle', 'double-circle', 'triangle', 'sesame' ] )
	] ),
	$matcherFactory->string(),
	] );
	$props['text-emphasis-color'] = $matcherFactory->color();
	$props['text-emphasis'] = UnorderedGroup::someOf( [
	$props['text-emphasis-style'],
	$props['text-emphasis-color'],
	] );
	$props['text-emphasis-position'] = UnorderedGroup::allOf( [
	new KeywordMatcher( [ 'over', 'under' ] ),
	Quantifier::optional( new KeywordMatcher( [ 'right', 'left' ] ) ),
	] );
	$props['text-shadow'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	Quantifier::hash( UnorderedGroup::allOf( [
	Quantifier::count( $matcherFactory->length(), 2, 3 ),
	Quantifier::optional( $matcherFactory->color() ),
	] ) )
	] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Box Alignment Module Level 3
	* @see https://www.w3.org/TR/2018/WD-css-align-3-20181206/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssAlign3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];
	$normal = new KeywordMatcher( 'normal' );
	$normalStretch = new KeywordMatcher( [ 'normal', 'stretch' ] );
	$autoNormalStretch = new KeywordMatcher( [ 'auto', 'normal', 'stretch' ] );
	$overflowPosition = Quantifier::optional( new KeywordMatcher( [ 'safe', 'unsafe' ] ) );
	$baselinePosition = new Juxtaposition( [
	Quantifier::optional( new KeywordMatcher( [ 'first', 'last' ] ) ),
	new KeywordMatcher( 'baseline' )
	] );
	$contentDistribution = new KeywordMatcher( [
	'space-between', 'space-around', 'space-evenly', 'stretch'
	] );
	$overflowAndSelfPosition = new Juxtaposition( [
	$overflowPosition,
	new KeywordMatcher( [
	'center', 'start', 'end', 'self-start', 'self-end', 'flex-start', 'flex-end',
	] ),
	] );
	$overflowAndSelfPositionLR = new Juxtaposition( [
	$overflowPosition,
	new KeywordMatcher( [
	'center', 'start', 'end', 'self-start', 'self-end', 'flex-start', 'flex-end', 'left', 'right',
	] ),
	] );
	$overflowAndContentPos = new Juxtaposition( [
	$overflowPosition,
	new KeywordMatcher( [ 'center', 'start', 'end', 'flex-start', 'flex-end' ] ),
	] );
	$overflowAndContentPosLR = new Juxtaposition( [
	$overflowPosition,
	new KeywordMatcher( [ 'center', 'start', 'end', 'flex-start', 'flex-end', 'left', 'right' ] ),
	] );

	$props['align-content'] = new Alternative( [
	$normal,
	$baselinePosition,
	$contentDistribution,
	$overflowAndContentPos,
	] );
	$props['justify-content'] = new Alternative( [
	$normal,
	$contentDistribution,
	$overflowAndContentPosLR,
	] );
	$props['place-content'] = new Juxtaposition( [
	$props['align-content'], Quantifier::optional( $props['justify-content'] )
	] );
	$props['align-self'] = new Alternative( [
	$autoNormalStretch,
	$baselinePosition,
	$overflowAndSelfPosition,
	] );
	$props['justify-self'] = new Alternative( [
	$autoNormalStretch,
	$baselinePosition,
	$overflowAndSelfPositionLR,
	] );
	$props['place-self'] = new Juxtaposition( [
	$props['align-self'], Quantifier::optional( $props['justify-self'] )
	] );
	$props['align-items'] = new Alternative( [
	$normalStretch,
	$baselinePosition,
	$overflowAndSelfPosition,
	] );
	$props['justify-items'] = new Alternative( [
	$normalStretch,
	$baselinePosition,
	$overflowAndSelfPositionLR,
	new KeywordMatcher( 'legacy' ),
	UnorderedGroup::allOf( [
	new KeywordMatcher( 'legacy' ),
	new KeywordMatcher( [ 'left', 'right', 'center' ] ),
	] ),
	] );
	$props['place-items'] = new Juxtaposition( [
	$props['align-items'], Quantifier::optional( $props['justify-items'] )
	] );
	$props['row-gap'] = new Alternative( [ $normal, $matcherFactory->lengthPercentage() ] );
	$props['column-gap'] = $props['row-gap'];
	$props['gap'] = new Juxtaposition( [
	$props['row-gap'], Quantifier::optional( $props['column-gap'] )
	] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Fragmentation Module Level 3
	* @see https://www.w3.org/TR/2018/CR-css-break-3-20181204/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssBreak3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];
	$props['break-before'] = new KeywordMatcher( [
	'auto', 'avoid', 'avoid-page', 'page', 'left', 'right', 'recto', 'verso', 'avoid-column',
	'column', 'avoid-region', 'region'
	] );
	$props['break-after'] = $props['break-before'];
	$props['break-inside'] = new KeywordMatcher( [
	'auto', 'avoid', 'avoid-page', 'avoid-column', 'avoid-region'
	] );
	$props['orphans'] = $matcherFactory->integer();
	$props['widows'] = $matcherFactory->integer();
	$props['box-decoration-break'] = new KeywordMatcher( [ 'slice', 'clone' ] );
	$props['page-break-before'] = new KeywordMatcher( [
	'auto', 'always', 'avoid', 'left', 'right'
	] );
	$props['page-break-after'] = $props['page-break-before'];
	$props['page-break-inside'] = new KeywordMatcher( [ 'auto', 'avoid' ] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Grid Layout Module Level 1
	* @see https://www.w3.org/TR/2017/CR-css-grid-1-20171214/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssGrid1( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$props = [];
	$comma = $matcherFactory->comma();
	$slash = new DelimMatcher( '/' );
	$customIdent = $matcherFactory->customIdent( [ 'span' ] );
	$lineNamesO = Quantifier::optional( new BlockMatcher(
	Token::T_LEFT_BRACKET, Quantifier::star( $customIdent )
	) );
	$trackBreadth = new Alternative( [
	$matcherFactory->lengthPercentage(),
	new TokenMatcher( Token::T_DIMENSION, static function ( Token $t ) {
	return $t->value() >= 0 && !strcasecmp( $t->unit(), 'fr' );
	} ),
	new KeywordMatcher( [ 'min-content', 'max-content', 'auto' ] )
	] );
	$inflexibleBreadth = new Alternative( [
	$matcherFactory->lengthPercentage(),
	new KeywordMatcher( [ 'min-content', 'max-content', 'auto' ] )
	] );
	$fixedBreadth = $matcherFactory->lengthPercentage();
	$trackSize = new Alternative( [
	$trackBreadth,
	new FunctionMatcher( 'minmax',
	new Juxtaposition( [ $inflexibleBreadth, $trackBreadth ], true )
	),
	new FunctionMatcher( 'fit-content', $matcherFactory->lengthPercentage() )
	] );
	$fixedSize = new Alternative( [
	$fixedBreadth,
	new FunctionMatcher( 'minmax', new Juxtaposition( [ $fixedBreadth, $trackBreadth ], true ) ),
	new FunctionMatcher( 'minmax',
	new Juxtaposition( [ $inflexibleBreadth, $fixedBreadth ], true )
	),
	] );
	$trackRepeat = new FunctionMatcher( 'repeat', new Juxtaposition( [
	$matcherFactory->integer(),
	$comma,
	Quantifier::plus( new Juxtaposition( [ $lineNamesO, $trackSize ] ) ),
	$lineNamesO
	] ) );
	$autoRepeat = new FunctionMatcher( 'repeat', new Juxtaposition( [
	new KeywordMatcher( [ 'auto-fill', 'auto-fit' ] ),
	$comma,
	Quantifier::plus( new Juxtaposition( [ $lineNamesO, $fixedSize ] ) ),
	$lineNamesO
	] ) );
	$fixedRepeat = new FunctionMatcher( 'repeat', new Juxtaposition( [
	$matcherFactory->integer(),
	$comma,
	Quantifier::plus( new Juxtaposition( [ $lineNamesO, $fixedSize ] ) ),
	$lineNamesO
	] ) );
	$trackList = new Juxtaposition( [
	Quantifier::plus( new Juxtaposition( [
	$lineNamesO, new Alternative( [ $trackSize, $trackRepeat ] )
	] ) ),
	$lineNamesO
	] );
	$autoTrackList = new Juxtaposition( [
	Quantifier::star( new Juxtaposition( [
	$lineNamesO, new Alternative( [ $fixedSize, $fixedRepeat ] )
	] ) ),
	$lineNamesO,
	$autoRepeat,
	Quantifier::star( new Juxtaposition( [
	$lineNamesO, new Alternative( [ $fixedSize, $fixedRepeat ] )
	] ) ),
	$lineNamesO,
	] );
	$explicitTrackList = new Juxtaposition( [
	Quantifier::plus( new Juxtaposition( [ $lineNamesO, $trackSize ] ) ),
	$lineNamesO
	] );
	$autoDense = UnorderedGroup::allOf( [
	new KeywordMatcher( 'auto-flow' ),
	Quantifier::optional( new KeywordMatcher( 'dense' ) )
	] );

	$props['grid-template-columns'] = new Alternative( [
	new KeywordMatcher( 'none' ), $trackList, $autoTrackList
	] );
	$props['grid-template-rows'] = $props['grid-template-columns'];
	$props['grid-template-areas'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	Quantifier::plus( $matcherFactory->string() ),
	] );
	$props['grid-template'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	new Juxtaposition( [ $props['grid-template-rows'], $slash, $props['grid-template-columns'] ] ),
	new Juxtaposition( [
	Quantifier::plus( new Juxtaposition( [
	$lineNamesO, $matcherFactory->string(), Quantifier::optional( $trackSize ), $lineNamesO
	] ) ),
	Quantifier::optional( new Juxtaposition( [ $slash, $explicitTrackList ] ) ),
	] )
	] );
	$props['grid-auto-columns'] = Quantifier::plus( $trackSize );
	$props['grid-auto-rows'] = $props['grid-auto-columns'];
	$props['grid-auto-flow'] = UnorderedGroup::someOf( [
	new KeywordMatcher( [ 'row', 'column' ] ),
	new KeywordMatcher( 'dense' )
	] );
	$props['grid'] = new Alternative( [
	$props['grid-template'],
	new Juxtaposition( [
	$props['grid-template-rows'],
	$slash,
	$autoDense,
	Quantifier::optional( $props['grid-auto-columns'] ),
	] ),
	new Juxtaposition( [
	$autoDense,
	Quantifier::optional( $props['grid-auto-rows'] ),
	$slash,
	$props['grid-template-columns'],
	] )
	] );

	$gridLine = new Alternative( [
	new KeywordMatcher( 'auto' ),
	$customIdent,
	UnorderedGroup::allOf( [
	$matcherFactory->integer(),
	Quantifier::optional( $customIdent )
	] ),
	UnorderedGroup::allOf( [
	new KeywordMatcher( 'span' ),
	UnorderedGroup::someOf( [
	$matcherFactory->integer(),
	$customIdent,
	] )
	] )
	] );
	$props['grid-row-start'] = $gridLine;
	$props['grid-column-start'] = $gridLine;
	$props['grid-row-end'] = $gridLine;
	$props['grid-column-end'] = $gridLine;
	$props['grid-row'] = new Juxtaposition( [
	$gridLine, Quantifier::optional( new Juxtaposition( [ $slash, $gridLine ] ) )
	] );
	$props['grid-column'] = $props['grid-row'];
	$props['grid-area'] = new Juxtaposition( [
	$gridLine, Quantifier::count( new Juxtaposition( [ $slash, $gridLine ] ), 0, 3 )
	] );

	// Replaced by the alignment module
	$align = $this->cssAlign3( $matcherFactory );
	$props['grid-row-gap'] = $align['row-gap'];
	$props['grid-column-gap'] = $align['column-gap'];
	$props['grid-gap'] = $align['gap'];

	// Also, these are copied from the alignment module. Copying is ok as long as
	// it's the identical object.
	$props['row-gap'] = $align['row-gap'];
	$props['column-gap'] = $align['column-gap'];
	$props['gap'] = $align['gap'];
	$props['justify-self'] = $align['justify-self'];
	$props['justify-items'] = $align['justify-items'];
	$props['align-self'] = $align['align-self'];
	$props['align-items'] = $align['align-items'];
	$props['justify-content'] = $align['justify-content'];
	$props['align-content'] = $align['align-content'];

	// Grid uses Flexbox's order property too. Copying is ok as long as
	// it's the identical object.
	$props['order'] = $this->cssFlexbox3( $matcherFactory )['order'];

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Filter Effects Module Level 1
	* @see https://www.w3.org/TR/2018/WD-filter-effects-1-20181218/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssFilter1( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$onp = Quantifier::optional( $matcherFactory->numberPercentage() );

	$props = [];

	$props['filter'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	Quantifier::plus( new Alternative( [
	new FunctionMatcher( 'blur', Quantifier::optional( $matcherFactory->length() ) ),
	new FunctionMatcher( 'brightness', $onp ),
	new FunctionMatcher( 'contrast', $onp ),
	new FunctionMatcher( 'drop-shadow', UnorderedGroup::allOf( [
	Quantifier::optional( $matcherFactory->color() ),
	Quantifier::count( $matcherFactory->length(), 2, 3 ),
	] ) ),
	new FunctionMatcher( 'grayscale', $onp ),
	new FunctionMatcher( 'hue-rotate', Quantifier::optional( new Alternative( [
	$matcherFactory->zero(),
	$matcherFactory->angle(),
	] ) ) ),
	new FunctionMatcher( 'invert', $onp ),
	new FunctionMatcher( 'opacity', $onp ),
	new FunctionMatcher( 'saturate', $onp ),
	new FunctionMatcher( 'sepia', $onp ),
	$matcherFactory->url( 'svg' ),
	] ) )
	] );
	$props['flood-color'] = $matcherFactory->color();
	$props['flood-opacity'] = $matcherFactory->numberPercentage();
	$props['color-interpolation-filters'] = new KeywordMatcher( [ 'auto', 'sRGB', 'linearRGB' ] );
	$props['lighting-color'] = $matcherFactory->color();

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Shapes and masking share these basic shapes
	* @see https://www.w3.org/TR/2014/CR-css-shapes-1-20140320/#basic-shape-functions
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher
	*/
	protected function basicShapes( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$border = $this->cssBorderBackground3( $matcherFactory );
	$sa = $matcherFactory->lengthPercentage();
	$sr = new Alternative( [
	$sa,
	new KeywordMatcher( [ 'closest-side', 'farthest-side' ] ),
	] );

	$basicShape = new Alternative( [
	new FunctionMatcher( 'inset', new Juxtaposition( [
	Quantifier::count( $sa, 1, 4 ),
	Quantifier::optional( new Juxtaposition( [
	new KeywordMatcher( 'round' ), $border['border-radius']
	] ) )
	] ) ),
	new FunctionMatcher( 'circle', new Juxtaposition( [
	Quantifier::optional( $sr ),
	Quantifier::optional( new Juxtaposition( [
	new KeywordMatcher( 'at' ), $matcherFactory->position()
	] ) )
	] ) ),
	new FunctionMatcher( 'ellipse', new Juxtaposition( [
	Quantifier::optional( Quantifier::count( $sr, 2, 2 ) ),
	Quantifier::optional( new Juxtaposition( [
	new KeywordMatcher( 'at' ), $matcherFactory->position()
	] ) )
	] ) ),
	new FunctionMatcher( 'polygon', new Juxtaposition( [
	Quantifier::optional( new KeywordMatcher( [ 'nonzero', 'evenodd' ] ) ),
	Quantifier::hash( Quantifier::count( $sa, 2, 2 ) ),
	], true ) ),
	] );

	$this->cache[__METHOD__] = $basicShape;
	return $basicShape;
	}

	/**
	* Properties for CSS Shapes Module Level 1
	* @see https://www.w3.org/TR/2014/CR-css-shapes-1-20140320/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssShapes1( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$shapeBoxKW = $this->backgroundTypes( $matcherFactory )['boxKeywords'];
	$shapeBoxKW[] = 'margin-box';

	$props = [];

	$props['shape-outside'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	UnorderedGroup::someOf( [
	$this->basicShapes( $matcherFactory ),
	new KeywordMatcher( $shapeBoxKW ),
	] ),
	$matcherFactory->url( 'image' ),
	] );
	$props['shape-image-threshold'] = $matcherFactory->number();
	$props['shape-margin'] = $matcherFactory->lengthPercentage();

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Masking Module Level 1
	* @see https://www.w3.org/TR/2014/CR-css-masking-1-20140826/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssMasking1( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$slash = new DelimMatcher( '/' );
	$bgtypes = $this->backgroundTypes( $matcherFactory );
	$bg = $this->cssBorderBackground3( $matcherFactory );
	$geometryBoxKeywords = array_merge( $bgtypes['boxKeywords'], [
	'margin-box', 'fill-box', 'stroke-box', 'view-box'
	] );
	$geometryBox = new KeywordMatcher( $geometryBoxKeywords );
	$maskRef = new Alternative( [
	new KeywordMatcher( 'none' ),
	$matcherFactory->image(),
	$matcherFactory->url( 'svg' ),
	] );
	$maskMode = new KeywordMatcher( [ 'alpha', 'luminance', 'auto' ] );
	$maskClip = new KeywordMatcher( array_merge( $geometryBoxKeywords, [ 'no-clip' ] ) );
	$maskComposite = new KeywordMatcher( [ 'add', 'subtract', 'intersect', 'exclude' ] );

	$props = [];

	$props['clip-path'] = new Alternative( [
	$matcherFactory->url( 'svg' ),
	UnorderedGroup::someOf( [
	$this->basicShapes( $matcherFactory ),
	$geometryBox,
	] ),
	new KeywordMatcher( 'none' ),
	] );
	$props['clip-rule'] = new KeywordMatcher( [ 'nonzero', 'evenodd' ] );
	$props['mask-image'] = Quantifier::hash( $maskRef );
	$props['mask-mode'] = Quantifier::hash( $maskMode );
	$props['mask-repeat'] = $bg['background-repeat'];
	$props['mask-position'] = Quantifier::hash( $matcherFactory->position() );
	$props['mask-clip'] = Quantifier::hash( $maskClip );
	$props['mask-origin'] = Quantifier::hash( $geometryBox );
	$props['mask-size'] = $bg['background-size'];
	$props['mask-composite'] = Quantifier::hash( $maskComposite );
	$props['mask'] = Quantifier::hash( UnorderedGroup::someOf( [
	new Juxtaposition( [ $maskRef, Quantifier::optional( $maskMode ) ] ),
	new Juxtaposition( [
	$matcherFactory->position(),
	Quantifier::optional( new Juxtaposition( [ $slash, $bgtypes['bgsize'] ] ) ),
	] ),
	$bgtypes['bgrepeat'],
	$geometryBox,
	$maskClip,
	$maskComposite,
	] ) );
	$props['mask-border-source'] = new Alternative( [
	new KeywordMatcher( 'none' ),
	$matcherFactory->image(),
	] );
	$props['mask-border-mode'] = new KeywordMatcher( [ 'luminance', 'alpha' ] );
	// Different from border-image-slice, sigh
	$props['mask-border-slice'] = new Juxtaposition( [
	Quantifier::count( $matcherFactory->numberPercentage(), 1, 4 ),
	Quantifier::optional( new KeywordMatcher( 'fill' ) ),
	] );
	$props['mask-border-width'] = $bg['border-image-width'];
	$props['mask-border-outset'] = $bg['border-image-outset'];
	$props['mask-border-repeat'] = $bg['border-image-repeat'];
	$props['mask-border'] = UnorderedGroup::someOf( [
	$props['mask-border-source'],
	new Juxtaposition( [
	$props['mask-border-slice'],
	Quantifier::optional( new Juxtaposition( [
	$slash,
	Quantifier::optional( $props['mask-border-width'] ),
	Quantifier::optional( new Juxtaposition( [
	$slash,
	$props['mask-border-outset'],
	] ) ),
	] ) ),
	] ),
	$props['mask-border-repeat'],
	$props['mask-border-mode'],
	] );
	$props['mask-type'] = new KeywordMatcher( [ 'luminance', 'alpha' ] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Additional keywords and functions from CSS Intrinsic and Extrinsic Sizing Level 3
	* @see https://www.w3.org/TR/2019/WD-css-sizing-3-20190522/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array of matchers
	*/
	protected function getSizingAdditions( MatcherFactory $matcherFactory ) {
	if ( !isset( $this->cache[__METHOD__] ) ) {
	$lengthPct = $matcherFactory->lengthPercentage();
	$this->cache[__METHOD__] = [
	new KeywordMatcher( [
	'max-content', 'min-content',
	] ),
	new FunctionMatcher( 'fit-content', $lengthPct ),
	// Browser-prefixed versions of the function, needed by Firefox as of January 2020
	new FunctionMatcher( '-moz-fit-content', $lengthPct ),
	];
	}
	return $this->cache[__METHOD__];
	}

	/**
	* Properties for CSS Intrinsic and Extrinsic Sizing Level 3
	* @see https://www.w3.org/TR/2019/WD-css-sizing-3-20190522/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssSizing3( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$none = new KeywordMatcher( 'none' );
	$auto = new KeywordMatcher( 'auto' );
	$lengthPct = $matcherFactory->lengthPercentage();
	$sizingValues = array_merge( [ $lengthPct ], $this->getSizingAdditions( $matcherFactory ) );

	$props = [];
	$props['width'] = new Alternative( array_merge( [ $auto ], $sizingValues ) );
	$props['min-width'] = $props['width'];
	$props['max-width'] = new Alternative( array_merge( [ $none ], $sizingValues ) );
	$props['height'] = $props['width'];
	$props['min-height'] = $props['min-width'];
	$props['max-height'] = $props['max-width'];

	$props['box-sizing'] = new KeywordMatcher( [ 'content-box', 'border-box' ] );

	$this->cache[__METHOD__] = $props;
	return $props;
	}

	/**
	* Properties for CSS Logical 1
	* @see https://www.w3.org/TR/2018/WD-css-logical-1-20180827/
	* @param MatcherFactory $matcherFactory Factory for Matchers
	* @return Matcher[] Array mapping declaration names (lowercase) to Matchers for the values
	*/
	protected function cssLogical1( MatcherFactory $matcherFactory ) {
	// @codeCoverageIgnoreStart
	if ( isset( $this->cache[__METHOD__] ) ) {
	return $this->cache[__METHOD__];
	}
	// @codeCoverageIgnoreEnd

	$cssSizing3 = $this->cssSizing3( $matcherFactory );
	$css2 = $this->css2( $matcherFactory );
	$cssPosition3 = $this->cssPosition3( $matcherFactory );
	$cssBorderBackground3 = $this->cssBorderBackground3( $matcherFactory );
	$borderCombo = UnorderedGroup::someOf( [
	$cssBorderBackground3['border-top-width'],
	$cssBorderBackground3['border-top-style'],
	$matcherFactory->color(),
	] );

	$props = [
	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#dimension-properties
	'block-size' => $cssSizing3['width'],
	'inline-size' => $cssSizing3['width'],
	'min-block-size' => $cssSizing3['min-width'],
	'min-inline-size' => $cssSizing3['min-width'],
	'max-block-size' => $cssSizing3['max-width'],
	'max-inline-size' => $cssSizing3['max-width'],

	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#margin-properties
	'margin-block-start' => $css2['margin-top'],
	'margin-block-end' => $css2['margin-top'],
	'margin-inline-start' => $css2['margin-top'],
	'margin-inline-end' => $css2['margin-top'],
	'margin-block' => Quantifier::count( $css2['margin-top'], 1, 2 ),
	'margin-inline' => Quantifier::count( $css2['margin-top'], 1, 2 ),

	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#inset-properties
	'inset-block-start' => $cssPosition3['top'],
	'inset-block-end' => $cssPosition3['top'],
	'inset-inline-start' => $cssPosition3['top'],
	'inset-inline-end' => $cssPosition3['top'],
	'inset-block' => Quantifier::count( $cssPosition3['top'], 1, 2 ),
	'inset-inline' => Quantifier::count( $cssPosition3['top'], 1, 2 ),
	'inset' => Quantifier::count( $cssPosition3['top'], 1, 4 ),

	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#padding-properties
	'padding-block-start' => $css2['padding-top'],
	'padding-block-end' => $css2['padding-top'],
	'padding-inline-start' => $css2['padding-top'],
	'padding-inline-end' => $css2['padding-top'],
	'padding-block' => Quantifier::count( $css2['padding-top'], 1, 2 ),
	'padding-inline' => Quantifier::count( $css2['padding-top'], 1, 2 ),

	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#border-width
	'border-block-start-width' => $cssBorderBackground3['border-top-width'],
	'border-block-end-width' => $cssBorderBackground3['border-top-width'],
	'border-inline-start-width' => $cssBorderBackground3['border-top-width'],
	'border-inline-end-width' => $cssBorderBackground3['border-top-width'],
	'border-block-width' => Quantifier::count( $cssBorderBackground3['border-top-width'], 1, 2 ),
	'border-inline-width' => Quantifier::count( $cssBorderBackground3['border-top-width'], 1, 2 ),

	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#border-style
	'border-block-start-style' => $cssBorderBackground3['border-top-style'],
	'border-block-end-style' => $cssBorderBackground3['border-top-style'],
	'border-inline-start-style' => $cssBorderBackground3['border-top-style'],
	'border-inline-end-style' => $cssBorderBackground3['border-top-style'],
	'border-block-style' => Quantifier::count( $cssBorderBackground3['border-top-style'], 1, 2 ),
	'border-inline-style' => Quantifier::count( $cssBorderBackground3['border-top-style'], 1, 2 ),

	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#border-color
	'border-block-start-color' => $cssBorderBackground3['border-top-color'],
	'border-block-end-color' => $cssBorderBackground3['border-top-color'],
	'border-inline-start-color' => $cssBorderBackground3['border-top-color'],
	'border-inline-end-color' => $cssBorderBackground3['border-top-color'],
	'border-block-color' => Quantifier::count( $cssBorderBackground3['border-top-color'], 1, 2 ),
	'border-inline-color' => Quantifier::count( $cssBorderBackground3['border-top-color'], 1, 2 ),

	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#border-shorthands
	'border-block-start' => $borderCombo,
	'border-block-end' => $borderCombo,
	'border-inline-start' => $borderCombo,
	'border-inline-end' => $borderCombo,
	// both are equivalent to 'border-block-start' per the spec
	'border-block' => $borderCombo,
	'border-inline' => $borderCombo,

	// https://www.w3.org/TR/2018/WD-css-logical-1-20180827/#border-radius-shorthands
	'border-start-start-radius' => $cssBorderBackground3['border-top-left-radius'],
	'border-start-end-radius' => $cssBorderBackground3['border-top-left-radius'],
	'border-end-start-radius' => $cssBorderBackground3['border-top-left-radius'],
	'border-end-end-radius' => $cssBorderBackground3['border-top-left-radius'],
	];

	$this->cache[__METHOD__] = $props;
	return $props;
	}
	}

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