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David Awogbemilachromium-wpt-export-bot
David Awogbemila
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[carousel] Use block axis as primary scroll-marker selection axis
The CSS working group resolution[1], as clarified in the linked bug, is to use the block axis as the primary axis when selecting the active scroll-marker in 2-D. [1] w3c/csswg-drafts#11198 (comment) Bug: 391612675 Change-Id: I3b9ecb5e2d2ef4c58dcb47c6e06b45c66ccd6f2b Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6310080 Commit-Queue: David Awogbemila <awogbemila@chromium.org> Reviewed-by: Steve Kobes <skobes@chromium.org> Cr-Commit-Position: refs/heads/main@{#1426563}
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‎css/css-overflow/scroll-marker-selection-in-2d-ref.html

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<!DOCTYPE html>
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<html>
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<body>
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<style>
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.scroller {
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width: 200px;
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height: 200px;
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position: relative;
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border: solid;
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scroll-marker-group: after;
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overflow: scroll;
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}
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.scroll_marker_group {
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height: 100px;
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width: 200px;
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border: solid;
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white-space: nowrap;
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display: grid;
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grid-auto-flow: column;
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}
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.vwm {
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writing-mode: vertical-lr;
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}
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.box {
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position: absolute;
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height: 50px;
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width: 50px;
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font-size: 50px;
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background-color: blue;
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}
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.current {
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border: solid blue;
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}
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.scroll_marker {
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height: 40px;
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width: 40px;
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font-size: 20px;
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display: inline-block;
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}
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.top_right {
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top: 0px;
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left: 100px;
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&>scroll_marker {
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background-color: teal;
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}
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}
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.bottom_left {
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top: 100px;
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left: 0px;
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}
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.tr.scroll_marker {
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background-color: teal;
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}
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.bl.scroll_marker {
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background-color: brown;
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}
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.space {
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height: 800px;
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width: 800px;
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position: absolute;
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}
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</style>
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<div>
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<div class="scroller">
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<div class="space"></div>
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<div class="top_right box">TR</div>
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<div class="bottom_left box">BL</div>
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</div>
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<div class="scroll_marker_group">
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<div class="current tr scroll_marker"></div>
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<div class="bl scroll_marker"></div>
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</div>
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<div class="vwm scroller">
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<div class="space"></div>
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<div class="top_right box">TR</div>
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<div class="bottom_left box">BL</div>
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</div>
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<div class="vwm scroll_marker_group">
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<div class="tr scroll_marker"></div>
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<div class="bl current scroll_marker"></div>
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</div>
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</div>
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</body>
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</html>

‎css/css-overflow/scroll-marker-selection-in-2d.html

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<!DOCTYPE html>
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<html>
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<head>
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<title>CSS Test: scroll tracking for ::scroll-markers on 2-D scrollers selects from block and then from inline. </title>
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<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#active-scroll-marker">
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<link rel="match" href="scroll-marker-selection-in-2d-ref.html">
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</head>
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<body>
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<style>
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.scroller {
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width: 200px;
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height: 200px;
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position: relative;
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border: solid;
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scroll-marker-group: after;
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overflow: scroll;
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&::scroll-marker-group {
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height: 100px;
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width: 200px;
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border: solid;
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display: grid;
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grid-auto-flow: column;
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white-space: nowrap;
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};
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}
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.vwm { /* vertical writing-mode */
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writing-mode: vertical-lr;
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}
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.box {
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position: absolute;
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height: 50px;
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width: 50px;
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font-size: 50px;
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background-color: blue;
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&::scroll-marker {
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height: 40px;
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width: 40px;
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font-size: 20px;
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display: inline-block;
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}
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&::scroll-marker:target-current {
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border: solid blue;
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}
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}
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.top_right {
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top: 0px;
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left: 100px;
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&::scroll-marker {
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content: "";
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background-color: teal;
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}
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}
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.bottom_left {
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top: 100px;
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left: 0px;
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&::scroll-marker {
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content: "";
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background-color: brown;
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}
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}
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.space {
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height: 800px;
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width: 800px;
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position: absolute;
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}
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</style>
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<div>
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<div class="scroller">
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<div class="space"></div>
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<div class="top_right box">TR</div>
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<div class="bottom_left box">BL</div>
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</div>
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<div class="vwm scroller">
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<div class="space"></div>
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<div class="top_right box">TR</div>
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<div class="bottom_left box">BL</div>
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</div>
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</div>
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</body>
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</html>

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