polyfill-import-conditions-in-html-2.js

;(new MutationObserver((mutationList, observer) => {
	if (!mutationList.length) return;

	for (var i = 0; i < mutationList.length; i++) {
		var mutation = mutationList[i];

		if (
			!('addedNodes' in mutation) ||
			!mutation.addedNodes.length
		) continue;

		for (var j = 0; j < mutation.addedNodes.length; j++) {
			var node = mutation.addedNodes[j];
			
			if (
				!('matches' in node) ||
				!node.matches('link[rel="stylesheet"][condition]') ||
				('condition' in node)
			) continue;

			node.href = 'data:text/css;base64,' + btoa('@import "' + (new URL(node.href, document.baseURI)).href + '" ' + node.getAttribute('condition') + ';');
			node.removeAttribute('condition');
		}
	}
})).observe(document, { attributes: false, childList: true, subtree: true });

polyfill-import-conditions-in-html.js

;(new MutationObserver((mutationList, observer) => {
	if (!mutationList.length) return;

	for (var i = 0; i < mutationList.length; i++) {
		var mutation = mutationList[i];

		if (
			!('addedNodes' in mutation) ||
			!mutation.addedNodes.length
		) continue;

		for (var j = 0; j < mutation.addedNodes.length; j++) {
			var node = mutation.addedNodes[j];
			
			if (
				!('matches' in node) ||
				!node.matches('link[rel="stylesheet"]') ||
				!node.media ||
				window.matchMedia(node.media).matches ||
				node.href.startsWith('data:')
			) continue;

			node.href = 'data:text/css;base64,' + btoa('@import "' + (new URL(node.href, document.baseURI)).href + '" ' + node.media + ';');
			node.media = 'all';
		}
	}
})).observe(document, { attributes: false, childList: true, subtree: true });