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Update web-platform-tests to revision 10168e9a5d44efbc6e7d416d1d454eb9c9f1396c
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<!DOCTYPE html>
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<title>position:sticky elements should respect the top constraint</title>
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<link rel="match" href="position-sticky-top-ref.html" />
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<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
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<meta name="assert" content="This test checks that position:sticky elements obey their top anchor after scrolling" />
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<style>
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.group {
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display: inline-block;
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position: relative;
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width: 150px;
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height: 250px;
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}
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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.scroller {
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position: relative;
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width: 100px;
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height: 200px;
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overflow-x: hidden;
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overflow-y: auto;
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}
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<script src="resources/sticky-util.js"></script>
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.contents {
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height: 500px;
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}
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.prepadding {
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height: 100px;
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}
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.container {
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height: 200px;
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}
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.innerpadding {
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height: 50px;
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}
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.indicator {
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background-color: red;
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position: absolute;
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left: 0;
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}
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.sticky {
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background-color: green;
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position: sticky;
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top: 50px;
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}
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.box {
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width: 100%;
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height: 100px;
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}
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</style>
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<body></body>
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<script>
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window.addEventListener('load', function() {
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document.getElementById('scroller1').scrollTop = 50;
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document.getElementById('scroller2').scrollTop = 125;
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document.getElementById('scroller3').scrollTop = 200;
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});
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test(() => {
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const elements = setupStickyTest('top', 50);
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elements.scroller.scrollTop = 100;
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const nonStickyTopY = elements.container.offsetTop +
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elements.filler.clientHeight;
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assert_equals(elements.sticky.offsetTop, nonStickyTopY);
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}, 'before reaching the sticking point the sticky box should not be offset');
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test(() => {
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const elements = setupStickyTest('top', 50);
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elements.scroller.scrollTop = 200;
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// This math cancels to sticky.offsetTop == (scroller.scrollTop + 50), but
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// for clarity the calculations are left explicit.
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const nonStickyTopY = elements.container.offsetTop +
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elements.filler.clientHeight;
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const targetTopY = elements.scroller.scrollTop + 50;
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const stickyOffset = targetTopY - nonStickyTopY;
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assert_equals(elements.sticky.offsetTop, nonStickyTopY + stickyOffset);
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}, 'after reaching the sticking point the sticky box should be offset');
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test(() => {
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const elements = setupStickyTest('top', 50);
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elements.scroller.scrollTop = 300;
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const maxOffsetInContainer = elements.container.offsetTop +
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elements.container.clientHeight - elements.sticky.clientHeight;
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assert_equals(elements.sticky.offsetTop, maxOffsetInContainer);
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}, 'the sticky box should not be pushed outside its containing block');
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</script>
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<div class="group">
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<div id="scroller1" class="scroller">
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<div class="indicator box" style="top: 150px;"></div>
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<div class="contents">
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<div class="prepadding"></div>
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<div class="container">
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<div class="innerpadding"></div>
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<div class="sticky box"></div>
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</div>
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</div>
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</div>
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</div>
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<div class="group">
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<div id="scroller2" class="scroller">
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<div class="indicator box" style="top: 175px;"></div>
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<div class="contents">
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<div class="prepadding"></div>
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<div class="container">
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<div class="innerpadding"></div>
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<div class="sticky box"></div>
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</div>
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</div>
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</div>
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</div>
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<div class="group">
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<div id="scroller3" class="scroller">
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<div class="indicator box" style="top: 200px;"></div>
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<div class="contents">
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<div class="prepadding"></div>
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<div class="container">
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<div class="innerpadding"></div>
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<div class="sticky box"></div>
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</div>
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</div>
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</div>
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</div>
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<div>You should see three green boxes above. No red should be visible.</div>
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