function fixSourceLinks( url, source ) {

		const srcRE = /(src=)(")(.*?)(")()/g;
		const linkRE = /(href=)(")(.*?)(")()/g;
		const imageSrcRE = /((?:image|img)\.src = )(")(.*?)(")()/g;
		const loaderLoadRE = /(loader\.load[a-z]*\s*\(\s*)('|")(.*?)('|")/ig;
		const loaderArrayLoadRE = /(loader\.load[a-z]*\(\s*\[)([\s\S]*?)(\])/ig;
		const loadFileRE = /(loadFile\s*\(\s*)('|")(.*?)('|")/ig;
		const threejsUrlRE = /(.*?)('|")([^"']*?)('|")([^'"]*?)(\/\*\s+threejs.org:\s+url\s+\*\/)/ig;
		const arrayLineRE = /^(\s*["|'])([\s\S]*?)(["|']*$)/;
		const urlPropRE = /(url:\s*)('|")(.*?)('|")/g;
		const workerRE = /(new\s+Worker\s*\(\s*)('|")(.*?)('|")/g;
		const importScriptsRE = /(importScripts\s*\(\s*)('|")(.*?)('|")/g;
		const moduleRE = /(import.*?)('|")(.*?)('|")/g;
		const prefix = getPrefix( url );
		const rootPrefix = getRootPrefix( url );

		function addCorrectPrefix( url ) {

			return ( url.startsWith( '/' ) )
				? `${rootPrefix}${url}`
				: removeDotDotSlash( ( prefix + url ).replace( /\/.\//g, '/' ) );

		}

		function addPrefix( url ) {

			return url.indexOf( '://' ) < 0 && ! url.startsWith( 'data:' ) && url[ 0 ] !== '?'
				? removeDotDotSlash( addCorrectPrefix( url ) )
				: url;

		}

		function makeLinkFDedQuotes( match, fn, q1, url, q2 ) {

			return fn + q1 + addPrefix( url ) + q2;

		}

		function makeTaggedFDedQuotes( match, start, q1, url, q2, suffix ) {

			return start + q1 + addPrefix( url ) + q2 + suffix;

		}

		function makeFDedQuotesModule( match, start, q1, url, q2 ) {

			// modules require relative paths or fully qualified, otherwise they are module names
			return `${start}${q1}${url.startsWith( '.' ) ? addPrefix( url ) : url}${q2}`;

		}

		function makeArrayLinksFDed( match, prefix, arrayStr, suffix ) {

			const lines = arrayStr.split( ',' ).map( ( line ) => {

				const m = arrayLineRE.exec( line );
				return m
					? `${m[ 1 ]}${addPrefix( m[ 2 ] )}${m[ 3 ]}`
					: line;

			} );
			return `${prefix}${lines.join( ',' )}${suffix}`;

		}

		source = source.replace( srcRE, makeTaggedFDedQuotes );
		source = source.replace( linkRE, makeTaggedFDedQuotes );
		source = source.replace( imageSrcRE, makeTaggedFDedQuotes );
		source = source.replace( urlPropRE, makeLinkFDedQuotes );
		source = source.replace( loadFileRE, makeLinkFDedQuotes );
		source = source.replace( loaderLoadRE, makeLinkFDedQuotes );
		source = source.replace( workerRE, makeLinkFDedQuotes );
		source = source.replace( importScriptsRE, makeLinkFDedQuotes );
		source = source.replace( loaderArrayLoadRE, makeArrayLinksFDed );
		source = source.replace( threejsUrlRE, makeTaggedFDedQuotes );
		source = source.replace( moduleRE, makeFDedQuotesModule );

		return source;

	}
Fix any local URLs into fully qualified urls.

Examples:
   resources/image.jpg ->  https://domain.org/webgl/resouces/image.jpg
   /3rdparty/lib.js    ->  https://domain.org/3rdparty/lib.js

The reason is (a) we're running the code as via blobUrl and nothing is relative to a blob.
(b) we can upload to jsfiddle/codepen and so need to link back to the files.

This is all kind of hacky in that it's just a bunch of regular expressions looking
for matches.

@param {string} url The URL of the file source.
@param {string} source An HTML file or JavaScript file
@returns {string} the source after having urls fixed.