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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-anchor-position/anchor-scope-shadow-names.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>CSS Anchor Positioning: anchor-scope name match is tree-scoped</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<!-- Tests that an anchor-scope placed into the shadow tree by ::part
does not affect anchor name lookup local to the shadow tree. -->
<div id=test_part>
<style>
#test_part {
.host::part(scope) {
/* This should have no effect, because --a is specified in a different
tree-scope than the --a inside the shadow. */
anchor-scope: --a;
}
}
</style>
<div class=host>
<template shadowrootmode=open>
<style>
.anchored {
background: coral;
position: absolute;
top: anchor(bottom, 1px);
position-anchor: --a;
width: 5px;
height: 5px;
}
.anchor {
background: skyblue;
height: 10px;
anchor-name: --a;
}
.cb {
position: relative;
width: 50px;
height: 50px;
border: 1px solid black;
}
.scope {
anchor-scope: --a;
}
</style>
<div class=cb>
<div class=anchor></div>
<div part=scope>
<div class=anchored></div>
</div>
</div>
</template>
</div>
<script>
test((t) => {
let host = document.querySelector('#test_part .host');
let e = host.shadowRoot.querySelector('.anchored');
assert_equals(getComputedStyle(e).top, '10px');
}, 'anchor-scope matches tree-scoped names');
</script>
</div>
<!-- Tests that a slotted-in element is not affected by any anchor-scope
in the shadow tree. -->
<hr>
<div id=test_slot>
<style>
#test_slot {
.anchor {
background: skyblue;
height: 10px;
anchor-name: --a;
}
.cb {
position: relative;
width: 50px;
height: 50px;
border: 1px solid black;
}
.anchored {
background: coral;
position: absolute;
top: anchor(bottom, 1px);
position-anchor: --a;
width: 5px;
height: 5px;
}
}
</style>
<div class=cb>
<div class=anchor></div>
<div class=host>
<template shadowrootmode=open>
<style>
.scope {
anchor-scope: --a;
}
</style>
<div class=scope>
<slot></slot>
</div>
</template>
<div class=anchored></div>
</div>
</div>
<script>
test((t) => {
let e = document.querySelector('#test_slot .anchored');
assert_equals(getComputedStyle(e).top, '10px');
}, 'anchor-scope in shadow does not affect slotted-in element');
</script>
</div>
<!-- Tests that anchor-scope in ::slotted() rule does not affect
anchoring on the outside of the shadow. -->
<hr>
<div id=test_slotted>
<style>
#test_slotted {
.anchor {
background: skyblue;
height: 10px;
anchor-name: --a;
}
.cb {
position: relative;
width: 50px;
height: 50px;
border: 1px solid black;
}
.anchored {
background: coral;
position: absolute;
top: anchor(bottom, 1px);
position-anchor: --a;
width: 5px;
height: 5px;
}
}
</style>
<div class=cb>
<div class=anchor></div>
<div class=host>
<template shadowrootmode=open>
<style>
::slotted(div) {
anchor-scope: --a;
}
</style>
<slot></slot>
</template>
<div class=anchored></div>
</div>
</div>
<script>
test((t) => {
let e = document.querySelector('#test_slotted .anchored');
assert_equals(getComputedStyle(e).top, '10px');
}, 'anchor-scope in ::slotted() rule does not affect anchoring outside');
</script>
</div>
<!-- Same as #test_slot, but anchor-scope is specified on :host. -->
<hr>
<div id=test_host>
<style>
#test_host {
.anchor {
background: skyblue;
height: 10px;
anchor-name: --a;
}
.cb {
position: relative;
width: 50px;
height: 50px;
border: 1px solid black;
}
.anchored {
background: coral;
position: absolute;
top: anchor(bottom, 1px);
position-anchor: --a;
width: 5px;
height: 5px;
}
}
</style>
<div class=cb>
<div class=anchor></div>
<div class=host>
<template shadowrootmode=open>
<style>
:host {
anchor-scope: --a;
}
</style>
<slot></slot>
</template>
<div class=anchored></div>
</div>
</div>
<script>
test((t) => {
let e = document.querySelector('#test_host .anchored');
assert_equals(getComputedStyle(e).top, '10px');
}, 'anchor-scope in shadow does not affected slotted-in element (:host)');
</script>
</div>
<!-- Tests that anchor-scope in a ::part() rule *does* affect
anchoring of slotted-in elements. -->
<hr>
<div id=test_part_slotted_in>
<style>
#test_part_slotted_in {
.host::part(scope) {
anchor-scope: --a;
}
.anchor {
background: skyblue;
height: 10px;
anchor-name: --a;
}
.cb {
position: relative;
width: 50px;
height: 50px;
border: 1px solid black;
}
.anchored {
background: coral;
position: absolute;
top: anchor(bottom, 1px);
position-anchor: --a;
width: 5px;
height: 5px;
}
}
</style>
<div class=cb>
<div class=anchor></div>
<div class=host>
<template shadowrootmode=open>
<div part=scope>
<slot></slot>
</div>
</template>
<div class=anchored></div>
</div>
</div>
<script>
test((t) => {
let e = document.querySelector('#test_part_slotted_in .anchored');
assert_equals(getComputedStyle(e).top, '1px'); // anchor() fallback
}, 'anchor-scope in ::part() affects slotted-in element');
</script>
</div>