Blitz - WPT: position-visibility-anchors-visible-after-scroll-in.html

wpt / css / css-anchor-position / position-visibility-anchors-visible-after-scroll-in.html

/css/css-anchor-position/position-visibility-anchors-visible-after-scroll-in.html

<!DOCTYPE html>
<html class=reftest-wait>
<meta charset="utf-8">
<meta name="assert" content="Scrolling an anchor in to view should cause a position-visibility: anchors-visible element to appear." />
<title>CSS Anchor Positioning Test: position-visibility: anchors-visible</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-visibility">
<link rel="match" href="position-visibility-anchors-visible-after-scroll-in-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<style>
  #scroll-container {
    overflow: hidden scroll;
    scrollbar-width: none;
    width: 300px;
    height: 100px;
  }

  #anchor {
    anchor-name: --a1;
    width: 100px;
    height: 100px;
    background: orange;
  }

  #spacer {
    height: 100px;
  }

  #target {
    position-anchor: --a1;
    position-visibility: anchors-visible;
    position-area: block-end center;
    width: 100px;
    height: 100px;
    background: green;
    position: absolute;
    inset: 0;
  }
</style>

<div id="scroll-container">
  <div id="anchor">anchor</div>
  <div id="spacer"></div>
  <div id="target">target</div>
</div>

<script>
  // #target should be initially visible because it is anchored to #anchor,
  // which is visible.
  waitForAtLeastOneFrame().then(() => {
    // Scroll #anchor out of view.
    const scroller = document.getElementById('scroll-container');
    scroller.scrollTop = 100;
    // #target should now be invisible.

    waitForAtLeastOneFrame().then(() => {
      // Scroll #anchor back into view.
      scroller.scrollTop = 0;

      // #target should now be visible again.
      takeScreenshot();
    });
  });
</script>

/css/css-anchor-position/position-visibility-anchors-visible-after-scroll-in-ref.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>
  #scroll-container {
    overflow: hidden scroll;
    scrollbar-width: none;
    width: 300px;
    height: 100px;
  }

  #anchor {
    width: 100px;
    height: 100px;
    background: orange;
    margin-bottom: 100px;
  }

  #target {
    width: 100px;
    height: 100px;
    background: green;
  }
</style>

<div id="scroll-container">
  <div id="anchor">anchor</div>
</div>
<div id="target">target</div>

<script>
  const scroller = document.getElementById('scroll-container');
  scroller.scrollTop = 0;
</script>