css/css-multicol/getclientrects-008.html

<!DOCTYPE html>
<title>getClientRects on monolithic elements and their container</title>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-getclientrects">
<link rel="help" href="https://drafts.csswg.org/css-multicol/">
<style>
  body {
    margin: 8px;
  }
</style>
<div style="columns:3; column-fill:auto; gap:10px; width:320px; height:100px; background:yellow;">
  <div id="container" style="background:gray;">
    <div id="monolith1" style="contain:size; width:50%; height:250px; background:cyan;"></div>
    <div id="monolith2" style="contain:size; width:50%; height:50px; background:black;"></div>
    <div id="monolith3" style="contain:size; width:50%; height:250px; background:hotpink;"></div>
  </div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  test(()=> {
    let rects = monolith1.getClientRects();
    assert_equals(rects.length, 1);
    assert_equals(rects[0].left, 8);
    assert_equals(rects[0].top, 8);
    assert_equals(rects[0].width, 50);
    assert_equals(rects[0].height, 250);
  }, "#monolith1");

  test(()=> {
    let rects = monolith2.getClientRects();
    assert_equals(rects.length, 1);
    assert_equals(rects[0].left, 118);
    assert_equals(rects[0].top, 8);
    assert_equals(rects[0].width, 50);
    assert_equals(rects[0].height, 50);
  }, "#monolith2");

  test(()=> {
    let rects = monolith3.getClientRects();
    assert_equals(rects.length, 1);
    assert_equals(rects[0].left, 228);
    assert_equals(rects[0].top, 8);
    assert_equals(rects[0].width, 50);
    assert_equals(rects[0].height, 250);
  }, "#monolith3");

  test(()=> {
    let rects = container.getClientRects();
    assert_equals(rects.length, 3);

    assert_equals(rects[0].left, 8);
    assert_equals(rects[0].top, 8);
    assert_equals(rects[0].width, 100);
    assert_equals(rects[0].height, 250);

    assert_equals(rects[1].left, 118);
    assert_equals(rects[1].top, 8);
    assert_equals(rects[1].width, 100);
    assert_equals(rects[1].height, 100);

    assert_equals(rects[2].left, 228);
    assert_equals(rects[2].top, 8);
    assert_equals(rects[2].width, 100);
    assert_equals(rects[2].height, 250);
  }, "#container");
</script>