css/cssom/CSSStyleSheet-constructable-disabled-regular-sheet-insertion.html

<!doctype html>
<title>Shouldn't crash / assert when inserting a stylesheet after there are disabled constructable sheets</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="help" href="https://wicg.github.io/construct-stylesheets/">
<script src = '/resources/testharness.js'></script>
<script src = '/resources/testharnessreport.js'></script>
<div id="host"></div>
<script>
test(function() {
  let sheet = new CSSStyleSheet({ disabled: true });
  sheet.replaceSync("div { color: red }");

  let root = document.getElementById("host").attachShadow({ mode: "open" });
  root.adoptedStyleSheets = [sheet];
  let style = document.createElement("style");
  root.innerHTML = `
    <style>div { color: green }</style>
    <div>Should be green</div>
  `;
  assert_equals(getComputedStyle(root.querySelector("div")).color, "rgb(0, 128, 0)", "Should insert the sheet at the right position and not crash");
});
</script>