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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.
52 lines
1.4 KiB
HTML
52 lines
1.4 KiB
HTML
<!DOCTYPE html>
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<style>
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.scrollable-container {
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width: 300px;
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height: 300px;
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overflow-y: scroll;
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border: 5px solid red;
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position: relative;
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}
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.sticky-box {
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width: 240px;
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height: 80px;
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background: #3498db;
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color: white;
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}
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.box {
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height: 500px;
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background-color: orange;
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}
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</style>
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<div class="scrollable-container" id="sticky-is-below-scrollport">
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<div class="box"></div>
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<div class="sticky-box">I stick within this scrollable box!</div>
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<div class="box"></div>
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</div>
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<div class="scrollable-container" id="sticky-is-inside-scrollport">
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<div class="box"></div>
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<div class="sticky-box">I stick within this scrollable box!</div>
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<div class="box"></div>
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</div>
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<div class="scrollable-container" id="sticky-is-above-scrollport">
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<div class="box"></div>
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<div class="sticky-box">I stick within this scrollable box!</div>
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<div class="box"></div>
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</div>
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<script>
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const stickyIsBelowScrollport = document.getElementById("sticky-is-below-scrollport");
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stickyIsBelowScrollport.scrollTop = 0;
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const stickyIsInsideScrollport = document.getElementById("sticky-is-inside-scrollport");
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stickyIsInsideScrollport.scrollTop = 390;
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const stickyIsAboveScrollport = document.getElementById("sticky-is-above-scrollport");
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stickyIsAboveScrollport.scrollTop = 780;
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</script>
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