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- This WPT test may be referenced by the following Test IDs:
- /css/css-conditional/container-queries/custom-property-style-query-change.html - WPT Dashboard Interop Dashboard
<!doctype html>
<title>CSS Container Queries Test: custom property style query changes</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
#container { container-name: my-container; }
#child, #grandchild { color: red; }
@container style(--target: child) {
#child { color: green; }
}
@container my-container style(--target: grandchild) {
#grandchild { color: green; }
}
</style>
<div id="container">
<div id="child"></div>
<div>
<div id="grandchild"></div>
</div>
</div>
<script>
setup(() => assert_implements_style_container_queries());
const green = "rgb(0, 128, 0)";
const red = "rgb(255, 0, 0)";
test(() => {
assert_equals(getComputedStyle(child).color, red);
assert_equals(getComputedStyle(grandchild).color, red);
}, "Initially no queries match.");
test(() => {
container.style.setProperty("--target", "child");
assert_equals(getComputedStyle(child).color, green);
assert_equals(getComputedStyle(grandchild).color, red);
}, "Target child");
test(() => {
container.style.setProperty("--target", "grandchild");
assert_equals(getComputedStyle(child).color, red);
assert_equals(getComputedStyle(grandchild).color, green);
}, "Target grandchild");
</script>
<style>
@property --length {
syntax: "<length>";
inherits: false;
initial-value: 0px;
}
#reg_container {
container-name: my-reg-container;
font-size: 50px;
}
#reg_child, #reg_grandchild { color: red; }
@container style(--length: 100px) {
#reg_child { color: green; }
}
@container my-reg-container style(--length: 200px) {
#reg_grandchild { color: green; }
}
</style>
<div id="reg_container">
<div id="reg_child"></div>
<div>
<div id="reg_grandchild"></div>
</div>
</div>
<script>
test(() => {
assert_equals(getComputedStyle(reg_child).color, red);
assert_equals(getComputedStyle(reg_grandchild).color, red);
}, "Initially no queries for registered property match.");
test(() => {
reg_container.style.setProperty("--length", "2em");
assert_equals(getComputedStyle(reg_child).color, green);
assert_equals(getComputedStyle(reg_grandchild).color, red);
}, "Registered property query child");
test(() => {
reg_container.style.setProperty("--length", "200px");
assert_equals(getComputedStyle(reg_child).color, red);
assert_equals(getComputedStyle(reg_grandchild).color, green);
}, "Registered property query grandchild");
</script>