helper_no_scalable_with_initial_scale.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <meta name="viewport" content="width=device-width, minimum-scale=0.25, initial-scale=0.5, user-scalable=no">

  <title>Tests that the layout viewport is not expanted to the minimum scale size if user-scalable=no is specified</title>

  <script type="application/javascript" src="apz_test_utils.js"></script>

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

  <style>

    html,body {

      overflow: hidden;

      margin: 0;

    div {

      position: absolute;

  </style>

</head>

<body>

  <div style="width: 400%; height: 400%; background: red;"></div>

  <div style="width: 100%; height: 100%; background-color: blue"></div>

  <script type="application/javascript">

    const utils = SpecialPowers.getDOMWindowUtils(window);

    async function test() {

      utils.scrollToVisual(100, 0, utils.UPDATE_TYPE_MAIN_THREAD,

                           utils.SCROLL_MODE_INSTANT);

      let receivedScrollEvent = false;

      window.visualViewport.addEventListener("scroll", () => {

        receivedScrollEvent = true;

      }, { once: true });

      await waitUntilApzStable();

      // Waits two frames to get a chance to deliver scroll events.

      await promiseFrame();

      await promiseFrame();

      ok(!receivedScrollEvent, "Scroll should never happen");

      is(visualViewport.offsetLeft, 0,

         "The visual viewport offset should not be moved");

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

  </script>

</body>

</html>