File: multicol-001.html

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<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#overview">
<link rel="help" href="https://drafts.csswg.org/css-multicol/">
<meta name="assert" content="Scroll snapping on fragmented block inside multicol">
<div id="scrollable" style="overflow:hidden; margin:100px; scroll-snap-type:x mandatory; columns:3; width:340px; column-gap:20px; column-fill:auto; height:100px;">
  <div style="height:200px; background:blue;"></div>
  <div id="target" style="scroll-snap-align:start; height:120px; background:cyan;"></div>
  <div style="height:200px; background:gray;"></div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  test(()=> {
    assert_equals(scrollable.scrollLeft, 240);
  }, "scroll-snap-align: start");

  test(()=> {
    target.style.scrollSnapAlign = "end";
    assert_equals(scrollable.scrollLeft, 120);
  }, "scroll-snap-align: end");

  test(()=> {
    target.style.scrollSnapAlign = "center";
    assert_equals(scrollable.scrollLeft, 180);
  }, "scroll-snap-align: center");
</script>