78 lines
2 KiB
HTML
78 lines
2 KiB
HTML
<!DOCTYPE html>
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<title>Sticky positioned element should be observable by offsetTop and offsetLeft</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 a sticky positioned element
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should be observable by offsetTop/offsetLeft." />
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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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}
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.container {
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position: relative; /* Required for offsetTop/offsetLeft tests. */
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overflow: scroll;
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width: 200px;
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height: 200px;
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}
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.spacer {
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width: 2000px;
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height: 2000px;
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}
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.box {
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width: 100px;
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height: 100px;
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background-color: green;
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}
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.sticky {
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position: sticky;
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top: 50px;
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left: 20px;
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}
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</style>
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<div id="scroller1" class="container">
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<div class="spacer"></div>
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</div>
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<script>
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test(() => {
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var scroller = document.getElementById('scroller1');
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scroller.scrollTop = 100;
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scroller.scrollLeft = 75;
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var sticky = document.createElement('div');
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sticky.className = 'sticky box';
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scroller.insertBefore(sticky, scroller.querySelector('.spacer'));
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assert_equals(sticky.offsetTop, scroller.scrollTop + 50);
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assert_equals(sticky.offsetLeft, scroller.scrollLeft + 20);
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}, 'offsetTop/offsetLeft should be correct for sticky after script insertion');
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</script>
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<div id="scroller2" class="container">
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<div id="sticky2" class="sticky box"></div>
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<div class="spacer"></div>
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</div>
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<script>
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test(function() {
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var scroller = document.getElementById('scroller2');
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var sticky = document.getElementById('sticky2');
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scroller.scrollTop = 100;
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scroller.scrollLeft = 75;
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var div = document.createElement('div');
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div.style.height = '65px';
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scroller.insertBefore(div, sticky);
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assert_equals(sticky.offsetTop, scroller.scrollTop + 50);
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assert_equals(sticky.offsetLeft, scroller.scrollLeft + 20);
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}, 'offsetTop/offsetLeft should be correct for sticky after script-caused layout');
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</script>
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