chromium/third_party/blink/web_tests/fast/inline/initial-letter-inline-kerning.html

<!doctype html>
<html>
<head>
<title>Tests Initial Letter with Inline Kerning</title>
<link rel="author" title="Google LLC" href="https://www.google.com/">
<link rel="help" href="https://drafts.csswg.org/css-inline/#initial-letter-inline-position">
<style>
.sample {
  font-size: 20px;
  margin-left: 20px;
  margin-right: 30px;
  margin-bottom: 30px;
  border: solid 1px blue;
  float: left;
}

.sample::first-letter {
    background: yellow;
    initial-letter: 3;
    font-style: italic;
    color: green;
}

.border::first-letter { border: solid 1px cyan; }
.padding::first-letter { padding: 10px; }


.ltr {
    direction: ltr;
    width: 10ch;
}

.rtl {
    direction: rtl;
    width: 10ch;
}

.vlr {
    writing-mode: vertical-lr;
    height: 5ch;
}

.vrl {
    writing-mode: vertical-rl;
    height: 5ch;
}

.sideways { text-orientation: sideways; }
</style>
</head>
<body>
<div class="sample ltr">fine thank you and you?</div>
<div class="sample rtl">fine thank you and you?</div>
<!-- Inline kerning is applied if zero padding and border. -->
<div class="sample ltr border">fine thank you and you?</div>
<div class="sample rtl border">fine thank you and you?</div>
<br style="clear:both">
<!-- Inline kerning is applied if zero padding and border. -->
<div class="sample ltr padding" style="width: 20ch">fine thank you and you? fine thank you and you? fine thank you and you? fine thank you and you?</div>
<div class="sample rtl padding" style="width: 20ch">fine thank you and you? fine thank you and you? fine thank you and you? fine thank you and you?</div>
<br style="clear:both">
<!-- Inline kerning is not applied vertical writing mode -->
<div class="sample vlr">fine thank you and you?</div>
<div class="sample vrl">fine thank you and you?</div>
<br style="clear:both">
<!-- Inline kerning is applied sideways in vertical writing mode -->
<div style="margin-bottom: 10px">text-orientation: sideways</div>
<br style="clear:both">
<div class="sample vlr sideways">fine thank you and you?</div>
<div class="sample vrl sideways">fine thank you and you?</div>
</body>
</html>