css/css-inline/baseline-source/baseline-source-first-003.html

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-inline-3/#baseline-source">
<style>
.target {
  inline-size: 200px;
  padding: 10px;
  border: solid 3px;
  position: relative;
  line-height: 0;
  font-size: 20px;
  writing-mode: vertical-lr;
}

.inner {
  border: solid 5px;
  padding: 10px;
  baseline-source: first;
  font-size: 30px;
}

table { border-spacing: 0; }
tr { vertical-align: baseline; }
td { padding: 0; }
caption {
  margin: 10px;
  background: lime;
  block-size: 20px;
}

span {
  display: inline-block;
  width: 1em;
  height: 1em;
  outline: solid cyan 3px;
  outline-offset: -3px;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('.target > *')">

<div class="target">
  <span data-offset-x="30"></span>
  <div class="inner" style="display: inline-block;" data-offset-x="10">
    <div><span></span></div>
    <div><span></span></div>
  </div>
</div>

<div class="target">
  <span data-offset-x="30"></span>
  <div class="inner" style="overflow: hidden; display: inline-block;" data-offset-x="10">
    <div><span></span></div>
    <div><span></span></div>
  </div>
</div>

<div class="target">
  <span data-offset-x="30"></span>
  <div class="inner" style="display: inline-block;" data-offset-x="10">
    <div style="overflow: hidden;">
      <div><span></span></div>
      <div><span></span></div>
    </div>
  </div>
</div>

<div class="target">
  <span data-offset-x="25"></span>
  <div class="inner" style="display: inline-block; columns: 2;" data-offset-x="10">
    <div style="font-size: 20px;"><span></span></div>
    <div style="font-size: 20px;"><span></span></div>
    <div><span></span></div>
    <div><span></span></div>
  </div>
</div>

<div class="target">
  <span data-offset-x="30"></span>
  <div class="inner" style="overflow: hidden; display: -webkit-inline-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3;" data-offset-x="10">
    <span></span><br>
    <span></span><br>
    <span></span><br>
    <span></span><br>
  </div>
</div>

<div class="target">
  <span data-offset-x="30"></span>
  <div class="inner" style="display: inline-flex; flex-direction: column;" data-offset-x="10">
    <div><span></span></div>
    <div><span></span></div>
  </div>
</div>

<div class="target">
  <span data-offset-x="30"></span>
  <div class="inner" style="display: inline-grid; grid-auto-flow: columns;" data-offset-x="10">
    <div><span></span></div>
    <div><span></span></div>
  </div>
</div>

<div class="target">
  <span data-offset-x="55"></span>
  <fieldset class="inner" style="display: inline-block;" data-offset-x="10">
    <span></span><br><span></span>
    <legend><span></span></legend>
  </fieldset>
</div>

<div class="target">
  <span data-offset-x="55"></span>
  <fieldset class="inner" style="display: inline-flex; flex-direction: column;" data-offset-x="10">
    <span></span><br><span></span>
    <legend><span></span></legend>
  </fieldset>
</div>

<div class="target">
  <span data-offset-x="70"></span>
  <table class="inner" style="display: inline-table;" data-offset-x="10">
    <caption></caption>
    <tr>
      <td style="font-size: 10px;"><span></span><br><span></span></td>
      <td><span></span><br><span></span></td>
    </tr>
    <tr>
      <td><span></span><br><span></span></td>
      <td style="font-size: 10px;"><span></span><br><span></span></td>
    </tr>
    <caption style="caption-side: bottom;"></caption>
  </table>
</div>

<div class="target">
  <span data-offset-x="70"></span>
  <div class="inner" style="display: inline-block;" data-offset-x="10">
    <table>
      <caption></caption>
      <tr>
        <td style="font-size: 10px;"><span></span><br><span></span></td>
        <td><span></span><br><span></span></td>
      </tr>
      <tr>
        <td><span></span><br><span></span></td>
        <td style="font-size: 10px;"><span></span><br><span></span></td>
      </tr>
      <caption style="caption-side: bottom;"></caption>
    </table>
  </div>
</div>