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Add a "User agents that do not support CSS" conformance class. #389

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merged 10 commits into from Jan 10, 2018
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Add a "User agents that do not support CSS" conformance class. #389

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13f4e37
Add a "User agents that do not support CSS" conformance class.
Oct 1, 2017
d105c20
Merge branch 'gh-pages' into conformance-class-css
silviapfeiffer Oct 27, 2017
47de8b9
Merge remote-tracking branch 'upstream/gh-pages' into conformance-cla…
silviapfeiffer Nov 11, 2017
9cb2999
Apply suggested changes by @tairt
silviapfeiffer Nov 11, 2017
1a54a2e
Merge remote-tracking branch 'upstream/gh-pages' into conformance-cla…
silviapfeiffer Dec 9, 2017
d1a221d
Update the number of conformance classes.
silviapfeiffer Dec 9, 2017
b751c6d
Merge remote-tracking branch 'upstream/gh-pages' into conformance-cla…
silviapfeiffer Jan 5, 2018
b72c3a0
Fix a broken link to "WebVTT cue text" (and reformat line breaks).
silviapfeiffer Jan 5, 2018
c23273e
Specifically mention that color classes need to be supported.
silviapfeiffer Jan 5, 2018
b7cd3c4
Rebuild index.html
silviapfeiffer Jan 5, 2018
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35 changes: 25 additions & 10 deletions index.bs
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Expand Up @@ -744,7 +744,21 @@ requirements.</p>
specification. [[!WEBIDL]]</p></dd>

<dt>User agents with no scripting support</dt>
<dd><p>All processing requirements in this specification apply, except those in [[#api]].</p></dd>
<dd><p>All processing requirements in this specification apply, except those in
[[#dom-construction-rules]] and [[#api]].</p></dd>

<dt><dfn>User agents that do not support CSS</dfn></dt>
<dd><p>All processing requirements in this specification apply, except parts of [[#parsing]] that
relate to stylesheets and CSS, and all of [[#rendering]] and [[#css-extensions]]. The user agent
must instead only render the text inside <a>WebVTT caption or subtitle cue text</a> in an
appropriate manner and specifically support the color classes defined in [[#default-classes]]. Any
other styling instructions are optional.</p> </dd>

<dt><dfn>User agents that do not support a full HTML CSS engine</dfn></dt>
<dd><p>All processing requirements in this specification apply, including the color classes defined
in [[#default-classes]]. However, the user agent will need to interpret the CSS related features in
[[#parsing]], [[#rendering]] and [[#css-extensions]] in such a way that the rendered results are
equivalent to what a full CSS supporting renderer produces.</p></dd>

<dt>Conformance checkers</dt>
<dd><p>Conformance checkers must verify that a <a>WebVTT file</a> conforms to the applicable
Expand Down Expand Up @@ -2783,9 +2797,8 @@ header</i> set, the user agent must run the following steps:</p>

<h3 id=region-settings-parsing algorithm>WebVTT region settings parsing</h3>

<p>When the <a>WebVTT parser</a> requires that the user agent <dfn>collect WebVTT region
settings</dfn> from a string |input| for a <a>text track</a>, the user agent must run the following
algorithm.</p>
<p>When the <a>WebVTT parser algorithm</a> says to <dfn>collect WebVTT region settings</dfn> from a
string |input| for a <a>text track</a>, the user agent must run the following algorithm.</p>

<p>A <dfn>WebVTT region object</dfn> is a conceptual construct to represent a <a>WebVTT region</a>
that is used as a root node for <a lt="List of WebVTT node objects">lists of WebVTT node
Expand Down Expand Up @@ -2914,9 +2927,9 @@ means that it is aborted at that point and returns nothing.</p>

<h3 id=cue-timings-and-settings-parsing algorithm>WebVTT cue timings and settings parsing</h3>

<p>When the algorithm above requires that the user agent <dfn>collect WebVTT cue timings and
settings</dfn> from a string |input| using a <a>text track list of regions</a> |regions| for a
<a>WebVTT cue</a> |cue|, the user agent must run the following algorithm.</p>
<p>When the algorithm above says to <dfn>collect WebVTT cue timings and settings</dfn> from a string
|input| using a <a>text track list of regions</a> |regions| for a <a>WebVTT cue</a> |cue|, the user
agent must run the following algorithm.</p>

<ol algorithm="collect WebVTT cue timings and settings">

Expand Down Expand Up @@ -4104,8 +4117,10 @@ follows:</p>

<p class="note">This section describes in some detail how to visually render <a>WebVTT caption or
subtitle cues</a> in a user agent. The processing model is quite tightly linked to media elements in
HTML. When supporting WebVTT in media players that don't support CSS, equivalent visual rendering
will need to be implemented.</p>
HTML, where CSS is available. <a>User agents that do not support CSS</a> are expected to render
plain text only, without styling and positioning features. <a>User agents that do not support a full
HTML CSS engine</a> are expected to render an equivalent visual representation to what a user agent
with a full CSS engine would render.</p>


<h3 id=processing-model algorithm>Processing model</h3>
Expand Down Expand Up @@ -5017,7 +5032,7 @@ then they must be interpreted as defined in the next section.</p>
<h2 id=css-extensions>CSS extensions</h2>

<p class="note">This section specifies some CSS pseudo-elements and pseudo-classes and how they
apply to WebVTT. This section does not apply to user agents that don't support CSS.</p>
apply to WebVTT. This section does not apply to <a>user agents that do not support CSS</a>.</p>


<h3 id=css-extensions-introduction>Introduction</h3>
Expand Down