63 lines
1.8 KiB
HTML
63 lines
1.8 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width">
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<title>Dynamic sticky position change doesn't break inner sticky positioned items</title>
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<link rel="help" href="https://drafts.csswg.org/css-position-3/#sticky-position">
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1908242">
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<link rel="author" title="Emilio Cobos" href="mailto:emilio@crisal.io">
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<link rel="author" title="Mozilla" href="https://mozilla.org">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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body {
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margin: 0;
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display: flex;
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}
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#content {
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border: 10px dashed gray;
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height: 600vh;
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}
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#sidebar {
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align-self: start;
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background-color: white;
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border: 10px dashed gray;
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top: 0;
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}
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#sidebar-header {
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position: sticky;
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top: 0;
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background-color: rgba(255, 0, 0, .5);
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}
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#sidebar-content {
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padding: 5px;
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height: 200vh;
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}
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</style>
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<div id=content>
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CONTENT
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</div>
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<div id=sidebar>
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<div id=sidebar-header>
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SIDEBAR TOP STICKY
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</div>
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<div id=sidebar-content>
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SIDEBAR CONTENT
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</div>
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</div>
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<script>
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let sidebar = document.getElementById("sidebar");
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let sidebarHeader = document.getElementById("sidebar-header");
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test(function() {
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// Make the header and sidebar stick.
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window.scrollTo(0, 100);
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assert_less_than(sidebar.getBoundingClientRect().top, 0, "Sidebar should not be stuck (yet)");
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assert_equals(sidebarHeader.getBoundingClientRect().top, 0, "Sidebar header should be stuck");
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sidebar.style.position = "sticky";
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assert_equals(sidebar.getBoundingClientRect().top, 0, "Sidebar should be stuck now");
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assert_equals(sidebarHeader.getBoundingClientRect().top, 10, "Sidebar header should be stuck under sidebar border");
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});
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</script>
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