57 lines
1.4 KiB
HTML
57 lines
1.4 KiB
HTML
<!DOCTYPE html>
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<title>position:sticky elements can be constrained by top and bottom exceeding container size</title>
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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 both top and bottom constraints" />
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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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.scroller {
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height: 200px;
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overflow: auto;
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position: relative;
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}
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.container {
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height: 120px;
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}
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.padding, .sticky {
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height: 50px;
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}
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.overflow-padding {
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height: 200px;
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}
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.sticky {
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position: sticky;
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background: green;
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top: -25px;
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bottom: 150px;
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}
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</style>
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<body>
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<div class="scroller">
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<div class="container">
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<div class="padding"></div>
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<div class="sticky"></div>
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</div>
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<div class="overflow-padding"></div>
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</div>
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</body>
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<script>
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test(() => {
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const scroller = document.querySelector('.scroller');
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const element = document.querySelector('.sticky');
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scroller.scrollTop = 0;
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assert_equals(element.offsetTop, 0);
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}, 'initially the sticky box should be pushed to the top of the container');
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test(() => {
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const scroller = document.querySelector('.scroller');
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const element = document.querySelector('.sticky');
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scroller.scrollTop = 95;
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assert_equals(element.offsetTop, 70);
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}, 'when we scroll past the flow position the top constraint pushes it down');
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</script>
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