Source code
Revision control
Copy as Markdown
Other Tools
Test Info: Warnings
- This test has a WPT meta file that expects 1 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /css/css-contain/content-visibility/content-visibility-anchor-positioning-003.html - WPT Dashboard Interop Dashboard
<!doctype HTML>
<meta charset=utf8>
<title>CSS Content Visibility: auto still anchors even if the anchor and positioned element are both skipped by the same element</title>
<link rel="author" title="Chris Harrelson" href="mailto:chrishtr@chromium.org">
<script src="/web-animations/testcommon.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#anchor, #positioned {
width: 200px;
height: 200px;
}
#lock {
height: 400px;
width: 400px;
content-visibility: auto;
border: 1px solid black;
}
pre {
position: relative;
top: 200px;
}
#container {
position:relative;
height: 10000px;
}
#anchor {
anchor-name: --anchor;
background-color: lightblue;
}
#positioned {
position: absolute;
background-color: lightgreen;
left: anchor(right);
position-anchor: --anchor;
}
</style>
<div id=container>
<div id=lock>
<div id=anchor></div>
<div id=positioned></div>
</div>
</div>
<pre id=output>
</pre>
<script>
"use strict";
let skipped = false;
lock.addEventListener("contentvisibilityautostatechange",
(e) => {
skipped = e.skipped;
});
promise_test(async t => {
await waitForAnimationFrames(2);
// When the anchor applies, the positioned element is moved right by 200px.
assert_equals(positioned.getBoundingClientRect().left, 209,
'#positioned should be anchored because they are both on-screen.');
window.scrollTo(0, 10000);
await waitForAnimationFrames(2);
assert_equals(positioned.getBoundingClientRect().left, 209,
"#positioned should be anchored because they are both in the skipped subtree of the same element.");
assert_true(skipped, "The content-visibility subtree is now skipped, even though there is a target anchor below it.");
});
</script>