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  .blue { font-size: 20px; color: blue; }
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<div>This test is verifying that adding content that uses first letter into
ruby tags works correctly.</div>

<p>&lt;ruby&gt; is defined in the
<ruby id='ruby'>
  H<rt><span class="blue">H</span>yper</rt>
  T<rt><span class="blue">T</span>ext</rt>
  M<rt><span class="blue">M</span>arkup</rt>
  L<rt><span class="blue">L</span>anguage</rt>
  5<rt><span class="blue">L</span>evel 5</rt>
  T<rt><span class="blue">T</span>est</rt>
</ruby> specs.</p>

<ruby xml:lang="ja">
  <rbc>
    <rb class='rb'>text斎</rb>
    <rb>藤</rb>
    <rb>信</rb>
    <rb>男</rb>
  </rbc>
  <rtc class="reading">
    <rt class='rt'>content textさい</rt>
    <rt>とう</rt>
    <rt>のぶ</rt>
    <rt>お</rt>
  </rtc>
  <rtc class="annotation">
    <rt rbspan="4" xml:lang="en">content W3C Associate Chairman</rt>
  </rtc>

  <rp>(</rp>
  <rt><span class="blue">a</span>aa</rt>
  <rp>)</rp>
</ruby>
