Blitz - WPT: position-anchor-dynamic-unset-raf-visibility-hidden.html

wpt / css / css-anchor-position / position-anchor-dynamic-unset-raf-visibility-hidden.html

/css/css-anchor-position/position-anchor-dynamic-unset-raf-visibility-hidden.html

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>CSS Anchor Positioning: element is visible after position-anchor is dynamically set then unset via rAF</title>
<link rel="author" title="Peng Zhou" href="mailto:zhoupeng.1996@bytedance.com">
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-anchor">
<link rel="match" href="position-anchor-dynamic-unset-visibility-hidden-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
#anchor {
  position: fixed;
  left: 50px;
  top: 50px;
  width: 50px;
  height: 50px;
  anchor-name: --a1;
  visibility: hidden;
}
#popover {
  position: fixed;
  left: anchor(left, 100px);
  top: anchor(bottom, 100px);
  width: 50px;
  height: 50px;
  background: green;
}
</style>
<div id="anchor"></div>
<div id="popover"></div>
<script>
// rAF 1: Anchor to the hidden element.
requestAnimationFrame(() => {
  popover.style.positionAnchor = '--a1';
  // rAF 2: Remove the anchor, `kAnchorsCssVisible` should be reset so the popover remains visible.
  requestAnimationFrame(() => {
    popover.style.positionAnchor = '';
    requestAnimationFrame(() => takeScreenshot());
  });
});
</script>
</html>

/css/css-anchor-position/position-anchor-dynamic-unset-visibility-hidden-ref.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Reference: popover is visible (green box) at fixed position</title>
<style>
#popover {
  position: fixed;
  left: 100px;
  top: 100px;
  width: 50px;
  height: 50px;
  background: green;
}
</style>
<div id="popover"></div>