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   5 <title>Text runs: HarfBuzz Manual</title>
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  24 <a name="text-runs"></a>Text runs</h2></div></div></div>
  25 <p>
  26       Real-world text usually contains codepoints from a mixture of
  27       different Unicode scripts (including punctuation, numbers, symbols,
  28       white-space characters, and other codepoints that do not belong
  29       to any script). Real-world text may also be marked up with
  30       formatting that changes font properties (including the font,
  31       font style, and font size).
  32     </p>
  33 <p>
  34       For shaping purposes, all real-world text streams must be first
  35       segmented into runs that have a uniform set of properties.
  36     </p>
  37 <p>
  38       In particular, shaping models always assume that every codepoint
  39       in a text run has the same <span class="emphasis"><em>direction</em></span>,
  40       <span class="emphasis"><em>script</em></span> tag, and
  41       <span class="emphasis"><em>language</em></span> tag.
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