skip-web2017-polyfills.js
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skip-web2017-polyfills.js
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	return 'IntersectionObserver' in window &&
	typeof fetch === 'function' &&
	// Ensure:
	// - standards compliant URL
	// - standards compliant URLSearchParams
	// - URL#toJSON method (came later)
	//
	// Facts:
	// - All browsers with URL also have URLSearchParams, don't need to check.
	// - Safari <= 7 and Chrome <= 31 had a buggy URL implementations.
	// - Firefox 29-43 had an incomplete URLSearchParams implementation. https://caniuse.com/urlsearchparams
	// - URL#toJSON was released in Firefox 54, Safari 11, and Chrome 71. https://caniuse.com/mdn-api_url_tojson
	// Thus we don't need to check for buggy URL or incomplete URLSearchParams.
	typeof URL === 'function' && 'toJSON' in URL.prototype;

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