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<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="utf-8"/>
<title>TTML 2 - List of changes</title>
<style>
div.exampleInner pre { margin-left: 1em;
margin-top: 0em; margin-bottom: 0em}
div.exampleInner { background-color: #d5dee3;
border-top-width: 4px;
border-top-style: double;
border-top-color: #d3d3d3;
border-bottom-width: 4px;
border-bottom-style: double;
border-bottom-color: #d3d3d3;
padding: 4px; margin: 0em }
.strong { font-weight: bold; }
.emphasis { font-style: italic; }
</style>
<link rel="stylesheet" type="text/css" href="https://www.w3.org/StyleSheets/TR/2016/base.css"/>
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<body>
<h1>Timed Text Markup Language 2 (TTML2) Change Summary</h1>
<nav id="toc">
<h2 class="introductory" id="table-of-contents">Table of Contents</h2>
<ul class="toc" role="directory">
<li class="tocline">
<a class="tocxref" href="#change-history">
<span class="secno">1</span>Change History
</a>
<ul class="toc">
<li class="tocline">
<a class="tocxref" href="#change-history-ttml2-1e-to-ttml2-2e-cr1"><span class="secno">1.1</span>TTML2 1e to TTML 2e CR1</a>
<ul class="toc">
<li class="tocline">
<a class="tocxref" href="#2e-cr1-syntax-changes">
<span class="secno">1.1.1</span>Syntax Changes
</a>
</li>
<li class="tocline">
<a class="tocxref" href="#2e-cr1-semantic-changes">
<span class="secno">1.1.2</span>Semantic (Only) Changes
</a>
</li>
<li class="tocline">
<a class="tocxref" href="#2e-cr1-editorial-changes">
<span class="secno">1.1.3</span>Editorial Changes
</a>
</li>
</ul>
</li>
<li class="tocline">
<a class="tocxref" href="#change-history-ttml2-2e-cr1-to-ttml2-2e-cr2"><span class="secno">1.2</span>TTML2 2e CR1 to TTML 2e CR2</a>
<ul class="toc">
<li class="tocline">
<a class="tocxref" href="#2e-cr2-syntax-changes">
<span class="secno">1.2.1</span>Syntax Changes
</a>
</li>
<li class="tocline">
<a class="tocxref" href="#2e-cr2-semantic-changes">
<span class="secno">1.2.2</span>Semantic (Only) Changes
</a>
</li>
<li class="tocline">
<a class="tocxref" href="#2e-cr2-editorial-changes">
<span class="secno">1.2.3</span>Editorial Changes
</a>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</nav>
<div class="div1">
<h2><a id="change-history"></a>1 Change History (Non-Normative)</h2>
<p>Change sections are ordered from most recent to least recent;
within each section changes are divided into technical and editorial
and further ordered by where they occur within the specification document.</p>
<div class="div2">
<h3><a id="change-history-ttml2-1e-to-ttml2-2e-cr1"></a>1.1 Technical Changes from
<a href="https://www.w3.org/TR/2018/REC-ttml2-20181108/">TTML2 First Edition</a> to
<a href="https://www.w3.org/TR/2020/CR-ttml2-20200128/">TTML2 Second Edition 1st Candidate Recommendation (CR1)</a></h3>
<div class="exampleInner">
<pre>
<span class="strong" id="2e-cr1-syntax-changes">Syntax Changes</span>
* Improve non-negative-real interoperability (<a href="https://github.com/w3c/ttml2/pull/944">w3c/ttml2#944</a>).
* Remove xml:base and @condition from chunk (<a href="https://github.com/w3c/ttml2/pull/962">w3c/ttml2#962</a>).
* Prevent font element from overriding generic font family (<a href="https://github.com/w3c/ttml2/pull/1049">w3c/ttml2#1049</a>).
* Add module framework (<a href="https://github.com/w3c/ttml2/pull/1096">w3c/ttml2#1096</a>).
* Add #presentation-audio feature designation (<a href="https://github.com/w3c/ttml2/pull/1097">w3c/ttml2#1097</a>).
* Add IMSC profile designators (<a href="https://github.com/w3c/ttml2/pull/1123">w3c/ttml2#1123</a>).
* Permit audio|image in body content model (<a href="https://github.com/w3c/ttml2/pull/1125">w3c/ttml2#1125</a>).
* Elaborate reference data embedding content model for data element (<a href="https://github.com/w3c/ttml2/pull/1132">w3c/ttml2#1132</a>).
* Add #opacity-image feature designation (<a href="https://github.com/w3c/ttml2/pull/1133">w3c/ttml2#1133</a>).
* Eliminate inconsistent use of xsd:nonNegativeInteger (<a href="https://github.com/w3c/ttml2/pull/1135">w3c/ttml2#1135</a>).
* Constrain ttp:profile's @use attribute (<a href="https://github.com/w3c/ttml2/pull/1137">w3c/ttml2#1137</a>).
* Add 'ignore' value to ttp:profile's @combine attribute, make default (<a href="https://github.com/w3c/ttml2/pull/1152">w3c/ttml2#1152</a>).
* Update content models w.r.t. permissible styling attributes (<a href="https://github.com/w3c/ttml2/pull/1157">w3c/ttml2#1157</a>).
<span class="strong" id="2e-cr1-semantic-changes">Semantic (Only) Changes</span>
* Define xlink:{type,actuate} semantics (<a href="https://github.com/w3c/ttml2/pull/1050">w3c/ttml2#1050</a>).
* Ignore text children of ruby container spans (<a href="https://github.com/w3c/ttml2/pull/1077">w3c/ttml2#1077</a>).
* Define shear value to degree mapping (<a href="https://github.com/w3c/ttml2/pull/1094">w3c/ttml2#1094</a>).
* Clarify media type parameters (<a href="https://github.com/w3c/ttml2/pull/1099">w3c/ttml2#1099</a>).
* Define font selection strategy used by line height algorithm (<a href="https://github.com/w3c/ttml2/pull/1106">w3c/ttml2#1106</a>).
* Remove error condition from scaling procedure (<a href="https://github.com/w3c/ttml2/pull/1109">w3c/ttml2#1109</a>).
* Correct #extent-root-version-2 designation (<a href="https://github.com/w3c/ttml2/pull/1110">w3c/ttml2#1110</a>).
* Change xlink:show default to 'none' (<a href="https://github.com/w3c/ttml2/pull/1126">w3c/ttml2#1126</a>).
* Ignore LWSP in data and chunk #PCDATA (<a href="https://github.com/w3c/ttml2/pull/1131">w3c/ttml2#1131</a>).
* Constrain @type with reference data embeddings (<a href="https://github.com/w3c/ttml2/pull/1149">w3c/ttml2#1149</a>).
* Prohibit animating a non-animatable style (<a href="https://github.com/w3c/ttml2/pull/1154">w3c/ttml2#1154</a>).
* Permit unidentified animate, set, region (<a href="https://github.com/w3c/ttml2/pull/1162">w3c/ttml2#1162</a>).
* Disallow fragment referencing nested profile (<a href="https://github.com/w3c/ttml2/pull/1165">w3c/ttml2#1165</a>).
* When speaking text, imply audio or audio source (<a href="https://github.com/w3c/ttml2/pull/1167">w3c/ttml2#1167</a>).
<span class="strong" id="2e-cr1-editorial-changes">Editorial Changes</span>
<i>Not Listed</i>
</pre>
</div> <!-- exampleInner -->
</div> <!-- div2 -->
<div class="div2">
<h3><a id="change-history-ttml2-2e-cr1-to-ttml2-2e-cr2"></a>1.2 Technical Changes from
<a href="https://www.w3.org/TR/2020/CR-ttml2-20200128/">TTML2 Second Edition 1st Candidate Recommendation (CR1)</a> to
<a href="https://www.w3.org/TR/2021/CR-ttml2-20210302/">TTML2 Second Edition 2nd Candidate Recommendation (CR2)</a></h3>
<div class="exampleInner">
<pre>
<span class="strong" id="2e-cr2-syntax-changes">Syntax Changes</span>
<i>None</i>
<span class="strong" id="2e-cr2-semantic-changes">Semantic (Only) Changes</span>
<i>None</i>
<span class="strong" id="2e-cr2-editorial-changes">Editorial Changes</span>
* Privacy considerations for font fingerprinting (<a href="https://github.com/w3c/ttml2/pull/1202">w3c/ttml2/#1202</a>).
* Privacy considerations for font fingerprinting (<a href="https://github.com/w3c/ttml2/pull/1203">w3c/ttml2/#1203</a>).
* Fix typo (<a href="https://github.com/w3c/ttml2/pull/1206">w3c/ttml2/#1206</a>).
* Add positioning examples (<a href="https://github.com/w3c/ttml2/pull/1207">w3c/ttml2/#1207</a>).
* Fix link (<a href="https://github.com/w3c/ttml2/pull/1209">w3c/ttml2/#1209</a>).
* Clarify application of font properties to tt:p element (<a href="https://github.com/w3c/ttml2/pull/1216">w3c/ttml2/#1216</a>).
* Fix link (<a href="https://github.com/w3c/ttml2/pull/1221">w3c/ttml2/#1221</a>).
</pre>
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