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Add a test for container-query parent and slotted child host styles #56899

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Add a test for container-query parent and slotted child host styles #56899

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27 changes: 27 additions & 0 deletions css/css-conditional/container-queries/container-for-shadow-dom.html
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Original file line number Diff line number Diff line change
Expand Up @@ -367,6 +367,28 @@
<div id="pseudo-2"></div>
</div>

<div id="named-host-to-slotted">
<template shadowrootmode="open">
<style>
:host {
container: --host-container / inline-size;
}
</style>
<slot></slot>
</template>
<div id="host-slotted-named">
<template shadowrootmode="open">
<style>
@container --host-container (width >= 0) {
:host {
color: green;
}
}
</style>
</template>
</div>
</div>

<script>
setup(() => {
assert_implements_size_container_queries();
Expand Down Expand Up @@ -481,4 +503,9 @@
const target = document.querySelector("#pseudo-2");
assert_equals(getComputedStyle(target, "::before").color, green);
}, "Search flat tree anchestors of the originating element of ::before");

test(() => {
const target = document.querySelector("#host-slotted-named");
assert_equals(getComputedStyle(target).color, green);
}, "Parent container name and style on :host, with query set on slotted child's :host");
</script>
28 changes: 28 additions & 0 deletions css/css-conditional/container-queries/style-container-for-shadow-dom.html
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,29 @@
</div>
</div>

<div id="named-host-to-slotted">
<template shadowrootmode="open">
<style>
:host {
--foo: baz;
container-name: --host-container;
}
</style>
<slot></slot>
</template>
<div id="host-slotted-named">
<template shadowrootmode="open">
<style>
@container --host-container style(--foo: baz) {
:host {
color: green;
}
}
</style>
</template>
</div>
</div>

<script>
setup(() => {
assert_implements_style_container_queries();
Expand Down Expand Up @@ -257,4 +280,9 @@
assert_equals(getComputedStyle(t12).color, green);
}, "A :host::part rule matching a container in the shadow tree");

test(() => {
const target = document.querySelector("#host-slotted-named");
assert_equals(getComputedStyle(target).color, green);
}, "Parent container name and style on :host, with query set on slotted child's :host");

</script>