test_addSheet.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test for addSheet</title>

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

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

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1024707">Mozilla Bug 1024707</a>

<iframe id="iframe1" src="additional_sheets_helper.html"></iframe>

<iframe id="iframe2" src="additional_sheets_helper.html"></iframe>

<pre id="test">

<script type="application/javascript">

let gIOService = SpecialPowers.Cc["@mozilla.org/network/io-service;1"]

  .getService(SpecialPowers.Ci.nsIIOService);

let gSSService = SpecialPowers.Cc["@mozilla.org/content/style-sheet-service;1"]

  .getService(SpecialPowers.Ci.nsIStyleSheetService);

function test(win, sheet) {

  let cs = win.getComputedStyle(win.document.body);

  is(cs.getPropertyValue("color"), "rgb(0, 0, 0)", "should have default color");

  var windowUtils = SpecialPowers.getDOMWindowUtils(win);

  windowUtils.addSheet(sheet, SpecialPowers.Ci.nsIDOMWindowUtils.USER_SHEET);

  is(cs.getPropertyValue("color"), "rgb(255, 0, 0)", "should have changed color to red");

function onDocumentElementInserted(url, callback) {

  const obs = SpecialPowers.Services.obs;

  function observer(doc) {

    if (doc.URL === url) {

      obs.removeObserver(observer, "document-element-inserted");

      callback(doc);

};

  obs.addObserver(observer, "document-element-inserted");

// Resolves when the document (and iframe1 + iframe2) have loaded.

const loadedPromise = new Promise(resolve => {

  window.addEventListener("load", () => resolve(), { once: true });

});

add_setup(async () => loadedPromise);

add_task(async function test_addSheet_in_existing_frame() {

  var uri = gIOService.newURI("data:text/css,body{color:red;}");

  let sheet = gSSService.preloadSheet(uri, SpecialPowers.Ci.nsIStyleSheetService.USER_SHEET);

  test(document.getElementById("iframe1").contentWindow, sheet);

  test(document.getElementById("iframe2").contentWindow, sheet);

});

// Regression test for https://bugzilla.mozilla.org/show_bug.cgi?id=1961064

add_task(async function test_addSheet_order_in_new_frame() {

  const USER_SHEET = SpecialPowers.Ci.nsIStyleSheetService.USER_SHEET;

  var uri1 = gIOService.newURI("data:text/css,body{--css-var:1;}");

  var uri2 = gIOService.newURI("data:text/css,body{--css-var:2;}");

  var uri3 = gIOService.newURI("data:text/css,body{--css-var:3;}");

  var uri4 = gIOService.newURI("data:text/css,body{--css-var:4;}");

  let sheet1 = gSSService.preloadSheet(uri1, USER_SHEET);

  let sheet2 = gSSService.preloadSheet(uri2, USER_SHEET);

  let sheet3 = gSSService.preloadSheet(uri3, USER_SHEET);

  let sheet4 = gSSService.preloadSheet(uri4, USER_SHEET);

  let f = document.createElement("iframe");

  f.src = "additional_sheets_helper.html?frame";

  let elementInsertedPromise = new Promise(resolve => {

    onDocumentElementInserted(f.src, doc => {

      info("Testing addSheet at document-element-inserted");

      // At this point, mStyleSetFilled == false, so the initialization

      // of the styles is delayed until Document::FillStyleSet is called:

      // https://bugzilla.mozilla.org/show_bug.cgi?id=1961064#c5

      let windowUtils = SpecialPowers.getDOMWindowUtils(doc.defaultView);

      windowUtils.addSheet(sheet1, USER_SHEET);

      windowUtils.addSheet(sheet2, USER_SHEET);

      resolve();

});

});

  await new Promise(resolve => {

    f.onload = resolve;

    document.body.append(f);

});

  await elementInsertedPromise;

  let cs = f.contentWindow.getComputedStyle(f.contentDocument.body);

  is(cs.getPropertyValue("--css-var"), "2", "Last addSheet (2) applies last");

  info("Testing addSheet in an existing document");

  // At this point, mStyleSetFilled == true, so the style sheets are applied

  // immediately.

  let windowUtils = SpecialPowers.getDOMWindowUtils(f.contentWindow);

  windowUtils.addSheet(sheet3, USER_SHEET);

  windowUtils.addSheet(sheet4, USER_SHEET);

  is(cs.getPropertyValue("--css-var"), "4", "Last addSheet (4) applies last");

  f.remove();

});

</script>

</body>

</html>