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57 lines
1.6 KiB
HTML
57 lines
1.6 KiB
HTML
<!DOCTYPE html>
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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="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
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<link rel="author" title="Mozilla" href="https://mozilla.org">
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1559627">
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<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/#suppression-triggers">
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<style>
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body, h1 {
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margin: 0
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}
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.sticky {
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width: 100%;
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top: 0;
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left: 0;
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}
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.sticky > div {
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width: 100%;
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height: 50px;
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background: darkblue;
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}
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header {
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background: lightblue;
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}
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main {
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background: lightgrey;
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height: 200vh;
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}
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</style>
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<header>
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<h1>Some title</h1>
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<span class="sticky"><div>Sticky header</div></span>
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</header>
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<main>
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Some actual content.
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</main>
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<script>
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const sticky = document.querySelector(".sticky");
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const nonStickyOffset = sticky.firstElementChild.offsetTop;
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const t = async_test("Scroll offset adjustments are correctly suppressed when changing the position of an inline");
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let firstEvent = true;
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window.onscroll = t.step_func(function() {
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sticky.style.position =
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document.documentElement.scrollTop > nonStickyOffset ? "fixed" : "static";
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if (firstEvent) {
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firstEvent = false;
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requestAnimationFrame(t.step_func(function() {
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requestAnimationFrame(t.step_func_done(function() {
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assert_equals(sticky.style.position, "fixed", "Element should become and remain fixed")
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}));
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}));
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}
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});
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window.onload = t.step_func(function() {
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window.scrollTo(0, nonStickyOffset + 1);
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});
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</script>
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