Blitz - WPT: position-visibility-anchors-visible-dynamic-anchor-toggle.html

wpt / css / css-anchor-position / position-visibility-anchors-visible-dynamic-anchor-toggle.html

/css/css-anchor-position/position-visibility-anchors-visible-dynamic-anchor-toggle.html

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>CSS Anchor Positioning Test: position-visibility: anchors-visible with dynamic anchor toggle</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-visibility">
<link rel="match" href="position-visibility-anchors-visible-dynamic-anchor-toggle-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<style>
#anchor {
  anchor-name: --a1;
  position: fixed;
  left: 50px;
  top: 50px;
  width: 100px;
  height: 100px;
  background: orange;
  visibility: hidden;
}
#target {
  width: 100px;
  height: 100px;
  background: red;
  position: fixed;
  left: anchor(left, 100px);
  top: anchor(bottom, 100px);
}
</style>
<div id="anchor"></div>
<div id="target"></div>
<script>
const observer = new ResizeObserver(() => {
  observer.disconnect();
  requestAnimationFrame(() => takeScreenshot());
});
observer.observe(target);

function setPositionAnchor(name) {
  target.style.positionAnchor = name;
  target.offsetWidth;
}

target.offsetWidth;
// 1. Anchor to the hidden element.
setPositionAnchor('--a1');
// 2. Remove the anchor (old scroll data becomes inactive).
setPositionAnchor('');
// 3. Anchor to the hidden element again.
setPositionAnchor('--a1');
</script>
</html>

/css/css-anchor-position/position-visibility-anchors-visible-dynamic-anchor-toggle-ref.html

<!DOCTYPE html>
<meta charset="utf-8">
<!-- This test passes if #target is hidden (anchor has visibility:hidden). -->