css/css-multicol/hit-test-in-vertical-rl.html

<!DOCTYPE html>
<link rel="help" href="https://crbug.com/1457423">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>body { margin: 0; }</style>
<div style="
  column-count: 2;
  column-gap: 14px;
  writing-mode: vertical-rl;
  inline-size: 200px;
  block-size: 100px;
  padding: 10px;">
<div style="block-size: 20px;"></div>
<div style="column-span: all; block-size: 20px;"></div>
<div id="child1" style="block-size: 70px; break-inside: avoid;"></div>
<div id="child2" style="block-size: 70px; break-inside: avoid;"></div>
</div>
<script>
const t = async_test('Hit-testing in vertical-rl writing-mode');
t.step(() => {
  assert_equals(document.elementFromPoint(15, 20), child1);
  assert_equals(document.elementFromPoint(15, 130), child2);

  const PADDING = 10;
  const e1 = new MouseEvent('click', {clientX:15, clientY:20, bubbles:true, cancelable:true});
  document.onclick = t.step_func(e => {
    assert_equals(e.target, child1);
    assert_equals(e.offsetX, e.clientX - PADDING);
    assert_equals(e.offsetY, e.clientY - PADDING);
  });
  child1.dispatchEvent(e1);

  const e2 = new MouseEvent('click', {clientX:15, clientY:130, bubbles:true, cancelable:true});
  document.onclick = t.step_func_done(e => {
    const COLUMN_GAP = 14;
    const COLUMN_INLINE_SIZE = (200 - COLUMN_GAP) / 2;
    assert_equals(e.target, child2);
    assert_equals(e.offsetX, e.clientX - PADDING);
    assert_equals(e.offsetY, e.clientY - PADDING - COLUMN_INLINE_SIZE - COLUMN_GAP);
  });
  child2.dispatchEvent(e2);
});
</script>