Blitz - WPT: single-axis-overflow-scroll-to-clip.html

wpt / css / css-overflow / single-axis-overflow-scroll-to-clip.html

/css/css-overflow/single-axis-overflow-scroll-to-clip.html

<!doctype html>
<html class="reftest-wait">
<head>
  <meta charset="utf-8">
  <title>Single-axis scroll containers visually clamp disabled axes on dynamic style changes</title>
  <link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollto">
  <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5572">
  <link rel="match" href="single-axis-overflow-scroll-to-clip-ref.html">
  <meta name="assert" content="A scroller with overflow: hidden has one of its axes set to overflow: clip. It repaints with the axis set to overflow: clip at a scroll offset of 0.">
  <style>
    body {
      margin: 0;
    }

    #clipper {
      width: 100px;
      height: 100px;
      overflow: hidden;
    }

    #scroller {
      width: 100px;
      height: 160px;
      overflow: hidden;
      scrollbar-width: none;
    }

    #scroller::-webkit-scrollbar {
      display: none;
    }

    #content {
      position: relative;
      width: 300px;
      height: 300px;
      background: rgb(0, 0, 255);
    }

    #top-band {
      position: absolute;
      top: 0;
      left: 0;
      width: 300px;
      height: 50px;
      background: rgb(0, 255, 0);
    }

    #x-marker {
      position: absolute;
      top: 50px;
      left: 40px;
      width: 20px;
      height: 50px;
      background: rgb(255, 255, 0);
    }
  </style>
</head>
<body>
  <div id="clipper">
    <div id="scroller">
      <div id="content">
        <div id="top-band"></div>
        <div id="x-marker"></div>
      </div>
    </div>
  </div>

  <script>
    document.documentElement.addEventListener('TestRendered', () => {
      const scroller = document.getElementById('scroller');

      // Paint the scrolled state first, then change overflow so the test
      // exercises a visual reset, not just the final computed values.
      scroller.scrollTo(40, 50);

      requestAnimationFrame(() => {
        requestAnimationFrame(() => {
          scroller.style.overflowX = 'hidden';
          scroller.style.overflowY = 'clip';

          requestAnimationFrame(() => {
            requestAnimationFrame(() => {
              document.documentElement.classList.remove('reftest-wait');
            });
          });
        });
      });
    });
  </script>
</body>
</html>

/css/css-overflow/single-axis-overflow-scroll-to-clip-ref.html

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>Visual clamp single-axis overflow: scroll to clip on dynamic style changes (Reference)</title>
  <style>
    body {
      margin: 0;
    }

    #expected {
      position: relative;
      width: 100px;
      height: 100px;
      background: rgb(0, 0, 255);
    }

    #top-band {
      position: absolute;
      top: 0;
      left: 0;
      width: 100px;
      height: 50px;
      background: rgb(0, 255, 0);
    }

    #x-marker {
      position: absolute;
      top: 50px;
      left: 0;
      width: 20px;
      height: 50px;
      background: rgb(255, 255, 0);
    }
  </style>
</head>
<body>
  <div id="expected">
    <div id="top-band"></div>
    <div id="x-marker"></div>
  </div>
</body>
</html>