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Sticky positioning is implemented by modifying the algorithm for assigning and refreshing scroll frames. Now, elements with "position: sticky" are assigned their own scroll frame, and their position is refreshed independently from regular scroll boxes. Refreshing the scroll offsets for sticky boxes does not require display list invalidation. A separate hash map is used for the scroll frames of sticky boxes. This is necessary because a single paintable box can have two scroll frames if it 1) has "position: sticky" and 2) contains scrollable overflow.
57 lines
1.3 KiB
HTML
57 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<link rel="match" href="reference/position-sticky-left-ref.html" />
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<style>
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* {
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scrollbar-width: none;
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}
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.scroll-container {
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width: 500px;
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overflow-x: scroll;
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white-space: nowrap;
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background-color: #f0f0f0;
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display: grid;
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grid-template-columns: 1000px 300px 1000px;
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border: 5px solid yellowgreen;
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}
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.section {
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height: 200px;
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background-color: orangered;
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}
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.sticky-element {
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position: sticky;
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left: 0;
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background-color: blueviolet;
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height: 200px;
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line-height: 200px;
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color: white;
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}
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</style>
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<div class="scroll-container" id="a">
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<div class="section"></div>
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<div class="sticky-element"></div>
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<div class="section"></div>
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</div>
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<div class="scroll-container" id="b">
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<div class="section"></div>
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<div class="sticky-element"></div>
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<div class="section"></div>
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</div>
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<div class="scroll-container" id="c">
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<div class="section"></div>
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<div class="sticky-element"></div>
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<div class="section"></div>
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</div>
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<script>
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const a = document.getElementById("a");
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a.scrollLeft = 0;
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const b = document.getElementById("b");
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b.scrollLeft = 900;
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const c = document.getElementById("c");
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c.scrollLeft = 1400;
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</script>
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