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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-anchor-position/anchor-center-scroll-vertical-wm-001.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>CSS Anchor Positioning Test: scroll adjusted anchor-center with a vertical writing-mode containing block</title>
<link rel="match" href="anchor-center-scroll-vertical-wm-001-ref.html">
<meta name="assert" content="An abspos box with justify-self:anchor-center whose containing block is a vertical writing mode stays centered on its anchor along the block (vertical) axis after the anchor's scroller scrolls.">
<style>
body { margin: 0; }
/* The containing block of #anchored. Its vertical writing-mode makes
justify-self the property that controls the vertical (Y) axis. */
#cb {
position: relative;
writing-mode: vertical-rl;
width: 400px;
height: 400px;
}
/* Reset to horizontal so the scroller's internal layout/scroll matches
the horizontal-writing-mode scroll tests. */
#scroller {
writing-mode: horizontal-tb;
width: 400px;
height: 400px;
overflow: auto;
background: orange;
}
#spacer { height: 100px; }
#anchor {
width: 100px;
height: 100px;
background: pink;
anchor-name: --anchor;
}
#anchored {
position: absolute;
position-anchor: --anchor;
justify-self: anchor-center;
left: 0;
width: 50px;
height: 50px;
background: purple;
}
#filler { height: 1000px; }
</style>
<div id="cb">
<div id="scroller">
<div id="spacer"></div>
<div id="anchor"></div>
<div id="filler"></div>
</div>
<div id="anchored"></div>
</div>
<script>
scroller.offsetTop;
scroller.scrollTop = 100;
</script>