css/css-display/empty-text-baseline-002.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: An Empty Text Node Should Not Generate a Baseline</title>
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<link rel="help" href="https://drafts.csswg.org/css-display-3/#intro">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9606">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1855583">
<link rel="stylesheet" href="/fonts/ahem.css">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
  margin: 0;
}

.ahem {
  font-family: Ahem;
}

.with-pseudo::before, .with-pseudo::after {
  content: "";
  width: 4px;
  height: 4px;
  border: 2px solid;
  background: orange;
  display: inline-block;
}

.font-size::before, .font-size::after {
  font-size: 100px;
}

.line-height::before, .line-height::after {
  line-height: 10;
}

.empty-concat::before, .empty-concat::after {
  content: "" "" "" "" "";
}

</style>
<div id="reference" class="ahem">x</div>
<div id="fs" class="ahem with-pseudo font-size">x</div>
<div id="ba" class="ahem with-pseudo line-height">x</div>
<div id="ec" class="ahem with-pseudo font-size empty-concat">x</div>
<script>
test(function() {
  assert_equals(fs.offsetHeight, reference.offsetHeight);
  assert_equals(ba.offsetHeight, reference.offsetHeight);
  assert_equals(ec.offsetHeight, reference.offsetHeight);
}, "Empty content pseudo-element does not generate baseline");

test(function() {
  const divs = [fs, ba, ec];
  for (let d of divs) {
    d.style = "white-space: pre";
  }
  assert_equals(fs.offsetHeight, reference.offsetHeight);
  assert_equals(ba.offsetHeight, reference.offsetHeight);
  assert_equals(ec.offsetHeight, reference.offsetHeight);
}, "Empty content pseudo-element does not generate baseline with white-space: pre");
</script>