css/css-flexbox/align-items-baseline-overflow-non-visible.html

<!DOCTYPE html>
<title>A block with 'overflow: hidden' should produce normal baseline</title>
<link rel="author" title="Koji Ishii" href="kojii@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-baselines">
<link rel="match" href="reference/align-items-baseline-overflow-non-visible-ref.html">
<style>
.flex {
  display: flex;
  align-items: baseline;
}
.overflow {
  overflow: hidden;
  height: 2em;
}
</style>

<body>
<!--
CSS2 states that:
  The baseline of an 'inline-block' is the baseline of its last line box in
  the normal flow, unless it has either no in-flow line boxes or if its
  'overflow' property has a computed value other than 'visible', in which case
  the baseline is the bottom margin edge.
  https://drafts.csswg.org/css2/visudet.html#propdef-vertical-align
This rule should apply only to 'inline-block', and not to normal block.
-->
<div class="flex">
  <span>XX</span>
  <div><div class="overflow">YY</div></div>
</div>
</body>