text-match-highlights-big-line-height.html

<!DOCTYPE html>
Text match highlight should not extend into the line spacing.
<div style="line-height: 30px; font-size: 15px">
<br id='b1'>AAA
</div>
  
<div style="line-height: 30px; font-size: 15px; writing-mode: vertical-rl">
<br id='b2'>AAA
</div>

<script>
function highlightRange(element, start, end, active) {
  var range = document.createRange();
  range.setStart(element, start);
  range.setEnd(element, end);
  internals.addTextMatchMarker(range, active);
}

if (window.internals) {
  onload = function() {
    highlightRange(document.getElementById('b1').nextSibling, 0, 3, 'kInactive');
    highlightRange(document.getElementById('b2').nextSibling, 0, 3, 'kActive');
    internals.setMarkedTextMatchesAreHighlighted(document, true);
  };
}
</script>

chromium/third_party/blink/web_tests/paint/text/text-match-highlights-big-line-height.html