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<!DOCTYPE html>
<title>CSS Position Test: ::backdrop inherits from originating element - computed values</title>
<link rel="help" href="https://drafts.csswg.org/css-position-4/#backdrop">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
dialog {
--foo: bar;
--bg: green;
left: 100px;
color-scheme: dark;
}
dialog::backdrop {
background-color: var(--bg);
left: inherit;
}
</style>
<dialog></dialog>
<script>
let dialog = document.querySelector("dialog");
setup(() => {
dialog.showModal();
});
test(() => {
let style = getComputedStyle(dialog, "::backdrop");
assert_equals(style.getPropertyValue("--foo"), "bar");
assert_equals(style.getPropertyValue("--bg"), "green");
}, "Inherit custom property");
test(() => {
assert_equals(getComputedStyle(dialog, "::backdrop").backgroundColor, "rgb(0, 128, 0)");
}, "Apply inherited custom property to background-color");
test(() => {
assert_equals(getComputedStyle(dialog, "::backdrop").colorScheme, "dark");
}, "Implicitly inherited color-scheme");
test(() => {
assert_equals(getComputedStyle(dialog, "::backdrop").left, "100px");
}, "Explicitly inherited left");
</script>
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