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<a name="text-runs"></a>Text runs</h2></div></div></div>
<p>
Real-world text usually contains codepoints from a mixture of
different Unicode scripts (including punctuation, numbers, symbols,
white-space characters, and other codepoints that do not belong
to any script). Real-world text may also be marked up with
formatting that changes font properties (including the font,
font style, and font size).
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<p>
For shaping purposes, all real-world text streams must be first
segmented into runs that have a uniform set of properties.
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<p>
In particular, shaping models always assume that every codepoint
in a text run has the same <span class="emphasis"><em>direction</em></span>,
<span class="emphasis"><em>script</em></span> tag, and
<span class="emphasis"><em>language</em></span> tag.
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