author Sebastian Hengst <>
Sun, 05 Feb 2023 13:12:06 +0100
changeset 651755 2e6262a410b7c25a3a7349825a7367462d4420fa
parent 560730 65394ac48dd4109dfa728d726646e9adda540fe5
permissions -rw-r--r--
Bug 1815090 - regenerate certificates in build/pgo/certs/. a=me * the build/pgo/certs/ changes were made using `./mach python build/pgo/`

  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width; initial-scale=1.0">
  <title>Tests that layout viewport is not larger than visual viewport on fullscreen</title>
  <script type="application/javascript" src="apz_test_utils.js"></script>
  <script src="/tests/SimpleTest/paint_listener.js"></script>
    body {
      margin: 0;
      padding: 0;
      overflow-x: hidden;
  <div style="background: blue; width: 100%; height: 100%;"></div>
  <div style="background: red; width: 200%; height: 100px;">overflowed element</div>
  <div id="target" style="background: green; width: 100px; height: 100px;"></div>
  <script type="application/javascript">
    const utils = SpecialPowers.getDOMWindowUtils(window);

    function waitForFullscreenChange() {
      return new Promise(resolve => {
        document.addEventListener("fullscreenchange", resolve);

    async function test(testDriver) {

      await waitForFullscreenChange();

      is(document.fullscreenElement, target,
         "The target element should have been fullscreen-ed");

      // Try to move rightward, but it should NOT happen.
      utils.scrollToVisual(200, 0, utils.UPDATE_TYPE_MAIN_THREAD,

      await waitUntilApzStable();

      is(visualViewport.offsetLeft, 0,
         "The visual viewport offset should never be moved");


    waitUntilApzStable().then(test).then(subtestDone, subtestFailed);