mozilla-central: testing/web-platform/tests/css/css-values/viewport-units-after-font-load.html@9ccc6a2267cbf69c621fec973bd28573c2a45a1f

Bug 1966586 - Reuse other browser windows when opening _blank links in Taskbar Tabs windows. r=nrishel This doesn't affect other tab additions, nor does it stop the tab bar from appearing altogether. The idea is that _if_ another tab is somehow made, the user should see it; but we should not create new tabs if we can avoid it. This also adds tests for opening URIs in popups and taskbar tabs to make it less likely that this breaks in future. Differential Revision: https://phabricator.services.mozilla.com/D253726

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Values: Viewport units are computed correctly after font load.</title>
<link rel="author"  title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author"  title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://www.w3.org/TR/css-values-3/#viewport-relative-lengths">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1620359">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe width=300 height=300 scrolling=no srcdoc=""></iframe>
<script>
let t = async_test("Viewport units are correctly updated after resize even if a font load has happened before");
let iframe = document.querySelector("iframe");
onload = t.step_func(function() {
  let doc = iframe.contentDocument;
  let win = iframe.contentWindow;
  doc.body.innerHTML = `
    <div style="width: 100vw; height: 100vh; background: green"></div>
  `;
  let div = doc.querySelector("div");
  let oldWidth = win.getComputedStyle(div).width;
  let oldHeight = win.getComputedStyle(div).height;
  assert_equals(oldWidth, win.innerWidth + "px", "Should fill the viewport");
  assert_equals(oldHeight, win.innerHeight + "px", "Should fill the viewport");
  let link = doc.createElement("link");
  link.rel = "stylesheet";
  link.href = "/fonts/ahem.css";
  link.onload = t.step_func(function() {
    iframe.width = 400;
    win.requestAnimationFrame(t.step_func(function() {
      win.requestAnimationFrame(t.step_func_done(function() {
        let newWidth = win.getComputedStyle(div).width;
        let newHeight = win.getComputedStyle(div).height;
        assert_equals(newWidth, win.innerWidth + "px", "Should fill the viewport");
        assert_equals(newHeight, win.innerHeight + "px", "Should fill the viewport");
        assert_equals(newHeight, oldHeight, "Height shouldn't have changed");
        assert_not_equals(newWidth, oldWidth, "Width should have changed");
      }));
    }));
  });
  doc.body.appendChild(link);
});
</script>

author	Duncan McIntosh <dmcintosh@mozilla.com>
	Wed, 09 Jul 2025 19:42:02 +0000 (4 hours ago)
changeset 795924	9ccc6a2267cbf69c621fec973bd28573c2a45a1f
parent 579025	3251c82e8e0f442c8147cd518c903d94b61bdb1a
permissions	-rw-r--r--