inject-stylesheet-iframe-data.html | Explore in Territory

<html>
<head>
<style type="text/css" media="screen">
  body { background:green; }
</style>
<script>
function iframeOnload()
{
    window.parent.injectStyleSheet(window);
    console.log("iframe loaded");
}
</script>
</head>

<body onload="iframeOnload()" id="iframeBody">
</body>

</html>

chromium/third_party/blink/web_tests/http/tests/devtools/elements/styles/resources/inject-stylesheet-iframe-data.html