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Add note from TTML1 regarding padding and writingMode (#358). #601

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Feb 8, 2018
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Add note from TTML1 regarding padding and writingMode (#358). #601

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add note from TTML1
cconcolato Jan 29, 2018
63fe2b0
Merge branch 'master' into issue-0358-ttml1-0205
skynavga Feb 8, 2018
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7 changes: 7 additions & 0 deletions spec/ttml2.xml
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Expand Up @@ -11036,6 +11036,13 @@ before edge, the second applies to the start and end edges, and the third applie
to the after edge.
If four <loc href="#style-value-length">&lt;length&gt;</loc> specifications are provided, then they apply to before, end,
after, and start edges, respectively.</p>
<note role="clarification">
<p>Percentage values are relative to the dimension of the region to which they apply. For example, if the before and after edges correspond
to the top and bottom edges of the region, as is the case for Latin text where <att>tts:writingMode</att> is equal to <code>"lrtb"</code>,
then percentage values that apply to either of the two edges are relative to the height of the region. Conversely, if the before and after
edges correspond to the right and left edges of the region, as is the case for Japanese text where <att>tts:writingMode</att> is equal to
<code>"tbrl"</code>, then percentage values that apply to either of the two edges are relative to the width of the region.</p>
</note>
<p>The <loc href="#style-value-length">&lt;length&gt;</loc> value(s) used to express padding must be non-negative.</p>
<p>If padding is applied to a <loc href="#content-vocabulary-span"><el>span</el></loc> element, and content from that element
is divided across multiple line areas, then the specified padding must be applied at each line break boundary. In contrast,
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