test_get_all_style_sheets.html

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<!DOCTYPE HTML>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=734861

-->

<meta charset="utf-8">

<title>Test for Bug 734861</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=734861">Mozilla Bug 734861</a>

<div id="host"></div>

<script>

/** Test for Bug 734861 **/

const InspectorUtils = SpecialPowers.InspectorUtils;

add_task(async function() {

  let sheet = new CSSStyleSheet();

  await sheet.replace(`* { color: blue }`);

  let host = document.querySelector("#host");

  host.adoptedStyleSheets = [sheet, sheet];

  document.adoptedStyleSheets.push(sheet);

  let res = InspectorUtils.getAllStyleSheets(document);

  let foundUA = false;

  let adoptedCount = 0;

  for (let s of InspectorUtils.getAllStyleSheets(document)) {

    if (SpecialPowers.unwrap(s) == sheet) {

      adoptedCount++;

    if (s.href === "resource://gre-resources/ua.css") {

      foundUA = true;

  ok(foundUA, "UA sheet should be returned with all the other sheets.");

  is(adoptedCount, 1, "Adopted stylesheet should show up once");

});

</script>