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chromium/third_party/blink/web_tests/external/wpt/css/css-text/letter-spacing/letter-spacing-212.html 

<!DOCTYPE html>
<html  lang="en" >
<meta charset="utf-8">
<title>letter-spacing at element boundaries</title>
<link rel='author' title='Elika J. Etemad' href='http://fantasai.inkedblade.net/contact'>
<link rel='help' href='https://www.w3.org/TR/css-text-3/#letter-spacing'>
<link rel='help' href='https://www.w3.org/TR/css-ruby-1/'>
<link rel='match' href='reference/letter-spacing-212-ref.html'>
<meta name="assert" content="Ruby annotations are centered on bases, not bases + trailing letter-spacing.">
<style type='text/css'>
  @import "/fonts/ahem.css";
  .contain {
    font: 20px/1 Ahem;
    margin: 1em; }
  .ls1 {
    letter-spacing: 1em;
  }
  .control p {
    white-space: pre-wrap;
    color: blue;
  }
  p {
    letter-spacing: 0;
    margin: 0;
  }
</style>

<div id='instructions'>Test passes if the blue pattern is identical to the black one.</div>

<div class="contain">
  <p class="ls1"><ruby>A<rt>a</rt>BB<rt>b</rt></ruby></p>
</div>

<div class="contain control">
  <p><ruby>A<rt>a</rt></ruby> <ruby>B B<rt>b</rt></ruby></p>
</div>