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Adding a note on duration and TTS #2027

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5 changes: 4 additions & 1 deletion epub33/rs/index.html
Original file line number Diff line number Diff line change
Expand Up @@ -1835,7 +1835,10 @@ <h5>Text-to-Speech</h5>
associated speech synthesis. The implicit duration of the <code>text</code> element (and by
inference, of the parent <code>par</code> element) is therefore determined by the execution of
the Text-to-Speech engine, and cannot be known at authoring time (factors like speech rate,
pauses and other prosody parameters influence the audio output).</p>
pauses and other prosody parameters influence the audio output).
This also means that the <a data-cite="epub-33#duration"><code>duration</code></a>
property values set in the package document at authoring time may be considered as approximative only, and should be considered as such by the Reading System.
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</p>
</section>
</section>

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