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<html>
<head>
<title>test</title>
<script type="application/javascript">
</script>
<style>
div {
width: 1000px;
height: 100px;
background-color: #f00;
}
@media screen and (min-width: 1px) {
div {
width: 200px;
background-color: yellow;
}
}
@media (prefers-color-scheme: dark) {
div {
background-color: darkblue;
}
}
</style>
<script>
"use strict";
if (window.location.search == "?constructed") {
const sheet = new CSSStyleSheet();
sheet.replaceSync(`div { z-index: 0 }`);
document.adoptedStyleSheets.push(sheet);
}
</script>
</head>
<body>
<div></div>
<iframe
src='https://example.org/document-builder.sjs?html=<style>html { background: cyan;} @media (prefers-color-scheme: dark) {html {background: darkred;}}'>
</iframe>
</body>
</html>