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<!doctype HTML>
<html>
<meta charset="utf8">
<title>Display Locking: style on hidden element & child</title>
<link rel="author" title="Rakina Zata Amni" href="mailto:rakina@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<meta name="assert" content="style is available for content-visibility hidden elements">
<style>
.hidden {
content-visibility: hidden;
}
</style>
<div id="container" class=hidden>
<div id="child">
<div id="grandchild"></div>
</div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test((t) => {
async function runTest() {
let container = document.getElementById("container");
container.style = "color: blue;";
t.step(() => assert_equals(getComputedStyle(container).color, "rgb(0, 0, 255)", "container color changed to blue"));
t.step(() => assert_equals(getComputedStyle(child).color, "rgb(0, 0, 255)", "child inherits blue color"));
t.step(() => assert_equals(getComputedStyle(grandchild).color, "rgb(0, 0, 255)", "grandchild inherits blue color"));
child.style = "color: green;";
t.step(() => assert_equals(getComputedStyle(container).color, "rgb(0, 0, 255)", "container color is still blue"));
t.step(() => assert_equals(getComputedStyle(child).color, "rgb(0, 128, 0)", "child color changed to green"));
t.step(() => assert_equals(getComputedStyle(grandchild).color, "rgb(0, 128, 0)", "grandchild inherits green color"));
child.style = "";
// Commit container, lock child.
container.classList.remove("hidden");
child.classList.add("hidden");
requestAnimationFrame(() => {
// Update style outside of the hidden subtree.
container.style = "color: red;";
container.offsetTop;
// Inheritance works as usual through hidden boundaries.
t.step(() => assert_equals(getComputedStyle(grandchild).color, "rgb(255, 0, 0)", "grandchild inherits red color"));
t.step(() => assert_equals(getComputedStyle(child).color, "rgb(255, 0, 0)", "child inherits red color"));
t.step(() => assert_equals(getComputedStyle(container).color, "rgb(255, 0, 0)", "container color changed to red"));
t.done();
});
}
window.onload = function() {
requestAnimationFrame(() => requestAnimationFrame(runTest));
};
}, "getComputedStyle gets up-to-date style");
</script>
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