chromium/src/third_party/blink/web_tests/http/tests/devtools/bindings/resources/dynamic-frame.html

<div>Hi, I'm a frame with dynamic script and stylesheet</div>
<script>
eval('window.foo = ()=>console.log("foo")\n//# sourceURL=dynamic-script.js');
var style = document.createElement('style');
style.textContent = 'div { color: blue; }\n/*# sourceURL=dynamic-style.css */';
document.body.appendChild(style);
</script>