53 lines
1.7 KiB
HTML
53 lines
1.7 KiB
HTML
<!DOCTYPE html>
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<meta name="viewport" content="width=device-width">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<link rel="author" title="Mozilla" href="https://mozilla.org">
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<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/">
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<style>
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body { margin: 0 }
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.content {
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height: 200px;
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background: lightblue;
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}
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.spacer {
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height: 300vh;
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}
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</style>
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<div class="content"></div>
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<div class="content" style="background: green"></div>
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<div class="spacer"></div>
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<script>
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const anchor = document.querySelectorAll(".content")[1];
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const t = async_test("Scroll adjustments happen even if it's triggered from scroll event listeners");
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window.addEventListener("scroll", t.step_func(function() {
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// Forcibly flush layout, this will flush the pending the node insertion.
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let scrollPosition = window.scrollY;
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requestAnimationFrame(t.step_func(function() {
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requestAnimationFrame(t.step_func(function() {
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assert_equals(window.scrollY, 400);
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t.done();
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}));
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}));
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}), { once: true });
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window.onload = t.step_func(function() {
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requestAnimationFrame(t.step_func(function() {
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// Scroll to the anchor node in a requestAnimationFrame callback so that
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// it queues a scroll event which will be fired in the next event loop.
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anchor.scrollIntoView({ behavior: "instant" });
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// Then in a setTimeout callback insert an element just right before the
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// anchor node, it will run before firing the scroll event.
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t.step_timeout(function() {
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const content = document.createElement("div");
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content.classList.add("content");
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content.style.background = "red";
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anchor.before(content);
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}, 0);
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}));
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});
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</script>
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