wpt/visual-viewport/viewport-scale-with-pinch-zoom-out.html at 7ad79800147ec49f2ec9c8d8b3122550a6e902fd · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>Viewport Scale : Pinch Zoom Out</title>
  <link rel=help href="https://github.com/w3c/csswg-drafts/issues/9004">
  <link rel=help href="https://www.w3.org/TR/2015/WD-mobile-accessibility-mapping-20150226/#zoom-magnification">
  <link rel="author" title="Shubham Gupta" href="mailto:shubham.gupta@chromium.org">
  <meta name="assert" content="The page can be pinch zoomed-out.">
  <meta name="viewport" content="minimum-scale=0.1, initial-scale=2.0, maximum-scale=10.0">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="/resources/testdriver.js"></script>
  <script src="/resources/testdriver-actions.js"></script>
  <script src="/resources/testdriver-vendor.js"></script>
  <script src="/visual-viewport/viewport_support.js"></script>
</head>

<body style="background-color: blue">
  <div style="font-size: 50px;">Pinch Zoom Test: Zoom Out</div>
  <script>
    function waitForScaleChange(previousScale) {
      return new Promise(resolve => {
        const poll = () => requestAnimationFrame(() => {
          if (window.visualViewport.scale !== previousScale) {
            resolve();
          } else {
            poll();
          }
        });
        poll();
      });
    }

    promise_test(async () => {
      const initialScale = window.visualViewport.scale;
      await pinchZoomOut();
      await Promise.race([
        waitForScaleChange(initialScale),
        new Promise(resolve => step_timeout(resolve, 5000)),
      ]);
      assert_less_than(window.visualViewport.scale, initialScale,
        "Scale should be less than initial scale after pinch zoom out");
    }) </script>
</body>

</html>