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ttml-ww-profiles.html
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ttml-ww-profiles.html
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<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<title>TTML Profiles for Internet Media Subtitles and Captions 1.1</title>
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<body>
<section id='abstract'>
<p>This specification defines two profiles of [[!ttml2-20180628]]: a text-only profile and an image-only profile. These
profiles are intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying
interoperability, consistent rendering and conversion to other subtitling and captioning formats.</p>
<p>This specification improves on [[ttml-imsc1.0.1]] by supporting contemporary practices, while retaining compatibility with
[[ttml-imsc1.0.1]] documents. Relative to [[ttml-imsc1.0.1]], any addition or deprecation of features are summarized at
Appendix <a href="#substantive-changes-summary"></a>.</p>
<p>It is feasible to create documents that simultaneously conform to both [[ttml10-sdp-us]] and the text-only profile.</p>
<p>The specification defines extensions to [[!ttml2-20180628]], as well as incorporates extensions specified in
[[!SMPTE2052-1]] and [[!EBU-TT-D]].</p>
<p>Both profiles are based on [[SUBM]].</p>
</section>
<section id='sotd'>
<p>For this specification to exit the CR stage, at least 2 independent implementations of every feature defined in this
specification but not already present in either [[ttml2-20180628]] or [[ttml-imsc1.0.1]] need to be documented in the
implementation report. The Working Group does not require that implementations are publicly available but encourages them to be
so.</p>
<p>The Working Group has identified the following features "at risk", indicating that one or more may become prohibited prior
to advancement to Proposed Recommendation, based on implementation experience:</p>
<ul>
<li><code>#lineShear</code></li>
<li><code>#length-root-container-relative</code></li>
<li><code>#shear</code></li>
</ul>
<p>A list of the substantive changes applied since the <a href="https://www.w3.org/TR/2017/WD-ttml-imsc1.1-20171017/">initial
Working Draft</a> is found at <a href="substantive-changes-summary.txt">substantive-changes-summary.txt</a>. For convenience, a
diff is offered at the <a href="https://www.w3.org/TR/2018/CR-ttml-imsc1.1-20180503/">W3C HTML Diff service</a>.</p>
</section>
<section id='scope'>
<h2>Scope</h2>
<p>This specification defines two profiles of [[!ttml2-20180628]]: a text-only profile and an image-only profile. These
profiles are intended for subtitle and caption delivery worldwide, including dialog language translation, content description,
captions for deaf and hard of hearing, etc.</p>
<p>This specification maintains the scope of [[ttml-imsc1.0.1]] while adding the minimal set of features necessary to support
contemporary practices for worldwide subtitling and captioning delivery.</p>
<p>The specification is designed such that:</p>
<ul>
<li>a valid Text Profile document as specified in [[ttml-imsc1.0.1]] is a valid <a>Text Profile</a> document as specified
herein;
</li>
<li>a valid Image Profile document as specified in [[ttml-imsc1.0.1]] is a valid <a>Image Profile</a> document as specified
herein;
</li>
<li>a <a>processor</a> defined herein transforms a Document Instance as specified in [[!ttml-imsc1.0.1]] as it would have
been transformed by a processor defined in [[ttml-imsc1.0.1]]; and
</li>
<li>whenever possible, extensions defined in [[ttml-imsc1.0.1]] are (i) replaced by their [[ttml2-20180628]] equivalent and
(ii) deprecated.</li>
</ul>
<p>The <a>Text Profile</a> is a syntactic superset of [[ttml10-sdp-us]], and a document can simultaneously conform to both
[[ttml10-sdp-us]] and the <a>Text Profile</a>.</p>
</section>
<section id='conventions'>
<h2>Documentation Conventions</h2>
<p>This specification uses the same conventions as [[!ttml2-20180628]] for the specification of parameter attributes, styling
attributes and metadata elements. In particular:</p>
<ul>
<li>Section 2.3 of [[!ttml2-20180628]] specifies conventions used in the XML representation of elements; and</li>
<li>Sections 7.2, 10.2 and 10.4 of [[!ttml2-20180628]] specify conventions used when specifying the syntax of attribute
values, such as in <a href="#imsc-extensions"></a>.
</li>
</ul>
<p>All content of this specification that is not explicitly marked as non-normative is considered to be normative. If a section
or appendix header contains the expression "non-normative", then the entirety of the section or appendix is considered
non-normative.</p>
<p>This specification uses <a>Feature</a> and <a>Extension</a> designations as defined in Appendices E.1 and F.1 at
[[!ttml2-20180628]]:</p>
<ul>
<li>when making reference to content conformance, these designations refer to the syntactic expression or the semantic
capability associated with each designated <a>Feature</a> or <a>Extension</a>; and
</li>
<li>when making reference to processor conformance, these designations refer to processing requirements associated with each
designated <a>Feature</a> or <a>Extension</a>.
</li>
</ul>
<p>If the name of an element referenced in this specification is not namespace qualified, then the TT namespace applies (see
<a href="#namespaces"></a>.)</p>
</section>
<section id='terms'>
<h2>Terms and Definitions</h2>
<p><dfn data-lt="Character Information Item|Character Information Items">Character Information Item</dfn>. See Section 2.2 at
[[!ttml2-20180628]].</p>
<p><dfn>Default Region</dfn>. See Section 9.3.1 at [[!ttml2-20180628]].</p>
<p><dfn data-lt="Document Instance|Document Instances">Document Instance</dfn>. See Section 2.2 at [[!ttml2-20180628]].</p>
<p><dfn>Default Processor Profile</dfn>. As defined in [[!ttml2-20180628]].</p>
<p><dfn>Extension</dfn>. See Section 2.2 at [[!ttml2-20180628]].</p>
<p><dfn>Feature</dfn>. See Section 2.2 at [[!ttml2-20180628]].</p>
<p><dfn>Intermediate Synchronic Document</dfn>. See Section 9.3.2 at [[!ttml2-20180628]].</p>
<p><dfn>Document Interchange Context</dfn>. See Section 2.2 at [[!ttml2-20180628]].</p>
<p><dfn>Document Processing Context</dfn>. As defined in [[!ttml2-20180628]].</p>
<p><dfn>Effective Processor Profile</dfn>. As defined in [[!ttml2-20180628]].</p>
<p><dfn>Image Profile transformation processor</dfn>. A <a>transformation processor</a> that conforms to the <a>Image
Profile</a>.</p>
<p><dfn>Image Profile presentation processor</dfn>. A <a>presentation processor</a> that conforms to the <a>Image
Profile</a>.</p>
<p><dfn>Linear White-Space</dfn>. See Section 2.3 at [[!ttml2-20180628]].</p>
<p><dfn>Override Content Profile</dfn>. As defined in [[!ttml2-20180628]].</p>
<p><dfn data-lt="processor|processors">Processor</dfn>. Either a <a>Presentation processor</a> or a <a>Transformation
processor</a>.</p>
<p><dfn>Presentation processor</dfn>. See Section 2.2 at [[!ttml2-20180628]].</p>
<p><dfn>Transformation processor</dfn>. See Section 2.2 at [[!ttml2-20180628]].</p>
<p><dfn data-lt="processor profile|processor profiles">Processor Profile</dfn>. As defined in [[!ttml2-20180628]].</p>
<p><dfn>Related Media Object</dfn>. See Section 2.2 at [[!ttml2-20180628]].</p>
<p><dfn>Related Video Object</dfn>. A <a>Related Media Object</a> that consists of a sequence of image frames, each a
rectangular array of pixels.</p>
<p><dfn>Root Container Region</dfn>. See Section 2.2 at [[!ttml2-20180628]].</p>
<p><dfn>Text Alternative</dfn>. As defined in [[!WCAG20]].</p>
<p><dfn>Text Profile transformation processor</dfn>. A <a>transformation processor</a> that conforms to the <a>Text
Profile</a>.</p>
<p><dfn>Text Profile presentation processor</dfn>. A <a>presentation processor</a> that conforms to the <a>Text
Profile</a>.</p>
</section>
<section id="conformance">
<p>A <a>Document Instance</a> that conforms to a profile defined herein:</p>
<ul>
<li>SHALL satisfy all normative provisions specified by the profile;</li>
<li>MAY include any vocabulary, syntax or attribute value associated with a <a>Feature</a> or <a>Extension</a> whose
disposition is <em>permitted</em> or <em>optional</em> in the profile;
</li>
<li>SHALL NOT include any vocabulary, syntax or attribute value associated with a <a>Feature</a> or <a>Extension</a> whose
disposition is <em>prohibited</em> in the profile.
</li>
</ul>
<p class='note'>A <a>Document Instance</a>, by definition, satisfies the requirements of Section 3.1 at [[!ttml2-20180628]],
and hence a <a>Document Instance</a> that conforms to a profile defined herein is also a conforming TTML1 Document
Instance.</p>
<p>A <a>presentation processor</a> that conforms to a profile defined in this specification:</p>
<ul>
<li>SHALL satisfy the Generic Processor Conformance requirements at Section 3.2.1 of [[!ttml2-20180628]];</li>
<li>SHALL satisfy all normative provisions specified by the profile; and</li>
<li>SHALL implement presentation semantic support for every <a>Feature</a> and <a>Extension</a> designated as
<em>permitted</em> or <em>permitted-deprecated</em> by the profile, subject to any additional constraints on each
<a>Feature</a> and <a>Extension</a> as specified by the profile.
</li>
<li>MAY implement presentation semantic support for every <a>Feature</a> and <a>Extension</a> designated as <em>optional</em>
by the profile, subject to any additional constraints on each <a>Feature</a> and <a>Extension</a> as specified by the
profile.
</li>
</ul>
<p>A <a>transformation processor</a> that conforms to a profile defined in this specification:</p>
<ul>
<li>SHALL satisfy the Generic Processor Conformance requirements at Section 3.2.1 of [[!ttml2-20180628]];</li>
<li>SHALL satisfy all normative provisions specified by the profile; and</li>
<li>SHALL implement transformation semantic support for every <a>Feature</a> and <a>Extension</a> designated as
<em>permitted</em> or or <em>permitted-deprecated</em> by the profile, subject to any additional constraints on each
<a>Feature</a> and <a>Extension</a> as specified by the profile.
</li>
<li>MAY implement transformation semantic support for every <a>Feature</a> and <a>Extension</a> designated as
<em>optional</em> by the profile, subject to any additional constraints on each <a>Feature</a> and <a>Extension</a> as
specified by the profile.
</li>
</ul>
<p>A <a>Feature</a> or <a>Extension</a> currently designated <em>permitted-deprecated</em> is intended to be designated as
<em>optional</em> or <em>prohibited</em> in future versions of this specification.</p>
<p class='note'>[[ttml2-20180628]] makes a distinction between a <a>presentation processor</a>, whose purpose is to present a
<a>Document Instance</a>, and <a>transformation processor</a>, whose purpose is to process a <a>Document Instance</a> without
presenting it. A renderer embedded in the media pipeline of a mobile device is an example of a <a>presentation processor</a>,
whereas a validator is an example of a <a>transformation processor</a>.</p>
<p class='note'>A <a>processor</a> that conforms to one profile defined in this specification is not required to conform to the
other profile. For convenience, the terms <a>Image Profile transformation processor</a>, <a>Text Profile transformation
processor</a>, <a>Image Profile presentation processor</a>, and <a>Text Profile presentation processor</a> are defined.</p>
<p class='note'>The use of the term <a>presentation processor</a> (<a>transformation processor</a>) within this specification
does not imply conformance to the DFXP Presentation Profile (DFXP Transformation Profile) specified in [[!ttml2-20180628]]. In
other words, it is not considered an error for a <a>presentation processor</a> (<a>transformation processor</a>) to conform to
a profile defined in this specification without also conforming to the DFXP Presentation Profile (DFXP Transformation
Profile).</p>
<p class='note'>This specification does not specify <a>presentation processor</a> or <a>transformation processor</a> behavior
when processing or transforming a non-conformant <a>Document Instance</a>.</p>
<p class='note'>The <em>permitted</em> and <em>prohibited</em> dispositions do not refer to the specification of a
<code>ttp:feature</code> or <code>ttp:extension</code> element as being permitted or prohibited within a
<code>ttp:profile</code> element.</p>
</section>
<section id='profiles'>
<h2>Profiles</h2>
<section>
<h3>General</h3>
<p>This specification defines two profiles of [[ttml2-20180628]]: the <a>Text Profile</a> and the <a>Image Profile</a>. In
the <a>Text Profile</a>, timed text is expressed using Unicode text exclusively, whereas, in the <a>Image Profile</a>, timed
text is expressed using bitmap images exclusively. The clear distinction between the two profiles reduces authoring and
processing complexity. For example, it allows systems to unambiguously specify whether text- and/or image-based timed text is
permitted.</p>
<p class='note'>Image-based timed text images can be used in scenarios where the required text rendering functionality is not
available, for example if the required fonts can not be distributed, or if the receiving processor has insufficient computing
resources to present text while displaying video. They can also be used to achieve a visual effect that is beyond the
capabilities of TTML, e.g. illuminated letters.</p>
<p>Notwithstanding special cases, e.g. a <a>Document Instance</a> that contains no <code>p</code>, <code>span</code>,
<code>br</code> element and no <code>smpte:backgroundImage</code> attribute, it is generally not possible to construct a
<a>Document Instance</a> that conforms to the <a>Text Profile</a> and <a>Image Profile</a> simultaneously, and it is not
possible to construct a <a>Document Instance</a> that results in the presentation of both text data and image data.</p>
<p>In applications that require subtitle/caption content in image form to be simultaneously available in text form, two
distinct <a data-lt="Document Instance">Document Instances</a>, one conforming to the <a>Text Profile</a> and the other
conforming to the <a>Image Profile</a>, SHOULD be offered. In addition, the <a>Text Profile</a> <a>Document Instance</a>
SHOULD be associated with the <a>Image Profile</a> <a>Document Instance</a> such that, when image content is encountered,
assistive technologies have access to its corresponding text form. The method by which this association is made is left to
each application.</p>
<p class='note'>The <code>altText</code> named metadata item also allows text equivalent string to be associated with an
image, e.g. to support indexation of the content and also facilitate quality checking of the document during authoring.</p>
<p>Annex <a href='#wcag-applications'></a> specifically discusses this specification in the context of the [[WCAG20]]
guidelines.</p>
</section>
<section>
<h3>Text Profile</h3>
<p>The <dfn>Text Profile</dfn> consists of Sections <a href="#supported-features-and-extensions"></a>, <a href=
"#common-constraints"></a> and <a href="#text-profile-constraints"></a>.</p>
</section>
<section>
<h3>Image Profile</h3>
<p>The <dfn>Image Profile</dfn> consists of Sections <a href="#supported-features-and-extensions"></a>, <a href=
"#common-constraints"></a> and <a href="#image-profile-constraints"></a>.</p>
</section>
<section id="profile-resolution">
<h3>Profile Resolution Semantics</h3>
<section>
<h4>General</h4>
<p>The Profile Semantics specified in [[!ttml2-20180628]] apply.</p>
<p class="note">The default value of prohibited attributes, e.g. <code>ttp:contentProfileCombination</code>, applies.</p>
<p>The <a>Text Profile</a> <a>processor profile</a> includes all of the features required by each of the following
<a>processor profiles</a>:</p>
<ul>
<li>[[ttml10-sdp-us]]</li>
<li>[[EBU-TT-D]]</li>
<li>[[ttml-imsc1.0.1]] Text Profile</li>
</ul>
<p>The <a>Image Profile</a> <a>processor profile</a> includes all of the features required by each of the following
<a>processor profiles</a>:</p>
<ul>
<li>[[ttml-imsc1.0.1]] Image Profile</li>
</ul>
<aside class="example">
The use of the <code>mimeType="application/mp4"</code> and <code>codecs="stpp.ttml.im1t"</code> attributes in a
[[MPEGDASH]] Manifest signals a track that consists of [[ttml-imsc1.0.1]] Text Profile documents. In this case the
Manifest is part of the <a>document interchange context</a>, and the <a>default processor profile</a> is extracted from
the <code>codecs</code> attribute and dereferenced via the [[ttml-profile-registry]].
</aside>
</section>
<section>
<h4>Override</h4>
<p>If one or more <code>ebuttm:conformsToStandard</code> elements, as specified in [[!EBU-TT-D]], are set to any of the
following designators, then the <a>override content profile</a> SHALL be set to the profile associated with any one of the
matching designators:</p>
<ul>
<li>[[ttml-imsc1.0.1]] Text Profile Designator</li>
<li>[[ttml-imsc1.0.1]] Image Profile Designator</li>
<li>
<a>Image Profile</a> Designator
</li>
<li>
<a>Text Profile</a> Designator
</li>
<li><code>urn:ebu:tt:distribution:2014-01</code>, as specified in [[EBU-TT-D]]</li>
</ul>
</section>
</section>
</section>
<section id="supported-features-and-extensions">
<h2>Supported Features and Extensions</h2>
<p>See <a href="#conformance"></a> for a definition of <em>permitted</em>, <em>prohibited</em>, <em>optional</em> and
<em>permitted-deprecated</em>.</p>
<table class='simple coldividers'>
<tbody>
<tr>
<th style="text-align:center">Feature or Extension</th>
<th style="text-align:center">Text Profile Disposition</th>
<th style="text-align:center">Image Profile Disposition</th>
</tr>
<tr>
<td colspan="3" style="text-align:center"><em>Relative to the TT Feature namespace</em><br>
All features specified in [[ttml2-20180628]] are <em>prohibited</em> unless specified otherwise below</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-animation"><code>#animation</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-animation-version-2"><code>#animation-version-2</code></a>
</td>
<td colspan="2">Partially supported via <code>#animation</code>.</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-background"><code>#background</code></a>
</td>
<td colspan="2">Partially supported via <code>#backgroundColor</code>.</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-backgroundColor"><code>#backgroundColor</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td>Partially supported via <code>#backgroundColor-region</code> and <code>#backgroundColor-block</code>.</td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-backgroundColor-block"><code>#backgroundColor-block</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-backgroundColor-inline"><code>#backgroundColor-inline</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-backgroundColor-region"><code>#backgroundColor-region</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-base"><code>#base</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-base-version-2"><code>#base-version-2</code></a>
</td>
<td colspan="2">Partially supported via <code>#base</code>.</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-bidi"><code>#bidi</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-bidi-version-2"><code>#bidi-version-2</code></a>
</td>
<td>Partially supported via <code>#bidi</code> and <code>#unicodeBidi-version-2</code>.</td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-cellResolution"><code>#cellResolution</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-color"><code>#color</code></a>
</td>
<td><span class="permitted label">permitted</span><br>
<small>Section <a href="#text-color"></a> specifies additional constraints.</small></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-content"><code>#content</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-contentProfiles"><code>#contentProfiles</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-core"><code>#core</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-direction"><code>#direction</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-disparity"><code>#disparity</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-display"><code>#display</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-display-block"><code>#display-block</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-display-inline"><code>#display-inline</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-display-region"><code>#display-region</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-display-version-2"><code>#display-version-2</code></a>
</td>
<td colspan="2">Partially supported via <code>#display</code>, <code>#display-block</code>, <code>#display-inline</code>,
and <code>#display-region</code>.</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-displayAlign"><code>#displayAlign</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-displayAlign-region"><code>#displayAlign-region</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-displayAlign-relative"><code>#displayAlign-relative</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-displayAlign-version-2"><code>#displayAlign-version-2</code></a>
</td>
<td>Partially supported via <code>#displayAlign-region</code>, and <code>#displayAlign-relative</code>.</td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-displayAspectRatio"><code>#displayAspectRatio</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span><br>
<small>Section <a href="#displayAspectRatio"></a> specifies additional constraints.</small></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent"><code>#extent</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent-full-version-2"><code>#extent-full-version-2</code></a>
</td>
<td colspan="2">Partially supported via <code>#extent-version-2</code>.</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent-image"><code>#extent-image</code></a>
</td>
<td><span class="prohibited label">prohibited</span></td>
<td><span class="permitted label">permitted</span><br>
<small>Section <a href="#image-ttml-image"></a> specifies additional constraints.</small></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent-length"><code>#extent-length</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent-length-version-2"><code>#extent-length-version-2</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td>See the disposition of <code>#length-version-2</code>.</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent-region"><code>#extent-region</code></a>
</td>
<td>Partially supported via <code>#extent-length</code>.<br>
<small>Section <a href="#text-extent-region"></a> specifies additional constraints.</small></td>
<td>Partially supported via <code>#extent-length</code>.<br>
<small>Section <a href="#image-extent-region"></a> specifies additional constraints.</small></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent-region-version-2"><code>#extent-region-version-2</code></a>
</td>
<td colspan="2">Partially supported via <code>#extent-region</code>.</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent-root"><code>#extent-root</code></a>
</td>
<td colspan="2">Partially supported via <code>#extent-length</code>.<br>
<small>Section <a href="#extent-root"></a> specifies additional constraints.</small></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent-root-version-2"><code>#extent-root-version-2</code></a>
</td>
<td colspan="2">Partially supported via <code>#extent-root</code>.</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-extent-version-2"><code>#extent-version-2</code></a>
</td>
<td>Partially supported via <code>#extent</code> and <code>#extent-region-version-2</code>.</td>
<td>Partially supported via <code>#extent</code>, <code>#extent-image</code>, and
<code>#extent-region-version-2</code>.</td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontFamily"><code>#fontFamily</code></a>
</td>
<td><span class="permitted label">permitted</span><br>
<small>Section <a href="#text-fontFamily"></a> specifies additional constraints.</small></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontFamily-generic"><code>#fontFamily-generic</code></a>
</td>
<td><span class="permitted label">permitted</span><br>
<small>Section <a href="#text-fontFamily-generic"></a> specifies additional constraints.</small></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontFamily-non-generic"><code>#fontFamily-non-generic</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontSize"><code>#fontSize</code></a>
</td>
<td>Partially supported via <code>#fontSize-isomorphic</code>.</td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontSize-isomorphic"><code>#fontSize-isomorphic</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontStyle"><code>#fontStyle</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontStyle-italic"><code>#fontStyle-italic</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontStyle-oblique"><code>#fontStyle-oblique</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontWeight"><code>#fontWeight</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-fontWeight-bold"><code>#fontWeight-bold</code></a>
</td>
<td><span class="permitted label">permitted</span></td>
<td><span class="prohibited label">prohibited</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-frameRate"><code>#frameRate</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span><br>
<small>Section <a href="#frame-rate-constraints"></a> specifies additional constraints.</small></td>
</tr>
<tr>
<td>
<a href=
"https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-frameRateMultiplier"><code>#frameRateMultiplier</code></a>
</td>
<td colspan="2"><span class="permitted label">permitted</span></td>
</tr>
<tr>
<td>
<a href="https://www.w3.org/TR/2018/CR-ttml2-20180628/#feature-image"><code>#image</code></a>
</td>
<td><span class="prohibited label">prohibited</span></td>
<td><span class="permitted label">permitted</span><br>
<small>Section <a href="#image-ttml-image"></a> specifies additional constraints.</small></td>