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[css-conditional-4] Extend supports feature to express font capabilities #6613

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Sep 16, 2021
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[css-conditional-4] Extend supports feature to express font capabilities #6613

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20 changes: 18 additions & 2 deletions css-conditional-4/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,8 +34,12 @@ Issue: In the future, copy the contents of [[css3-conditional]] into this docume
This level of the specification extends the <<supports-feature>> syntax as follows:

<pre class="prod def" nohighlight>
<dfn>&lt;supports-feature></dfn> = <<supports-selector-fn>> | <<supports-decl>>
<dfn>&lt;supports-feature></dfn> = <<supports-selector-fn>> | <<supports-font-technology-fn>> | <<supports-decl>>
<dfn>&lt;supports-selector-fn></dfn> = selector( <<complex-selector>> )
<dfn>&lt;supports-font-technology-fn></dfn> = font-technology ( <<font-technology>> )
<dfn>&lt;font-technology></dfn> = [ features-opentype | features-aat | features-graphite
| color-colrv0 | color-colrv1 | color-svg | color-sbix | color-cbdt
| variations | palettes | incremental ]
</pre>

: <<supports-selector-fn>>
Expand All @@ -44,6 +48,13 @@ This level of the specification extends the <<supports-feature>> syntax as follo
<a href="#dfn-support-selector">supports the selector</a>
provided as an argument to the function.

: <<supports-font-technology-fn>>
::
The result is true if the UA
<a href="dfn-support-font-technology">supports the font technology</a>
provided as an argument to the function.


<h3 id="support-definition-ext">Extensions to the definition of support</h3>

A CSS processor is considered to
Expand All @@ -52,5 +63,10 @@ if it accepts that selector (rather than discarding it as a
parse error), and that selector doesn't contain
<a>unknown -webkit- pseudo-elements</a>.

<h2 class=no-num id="acknowledgments">Acknowledgments</h2>
A CSS processor is considered to
<dfn export for=CSS id="dfn-support-font-technology">support a font technology</dfn>
when the text and layout processing engine ingesting
this CSS text is capable of utilising the specified font-technology
in layout and rendering.

<h2 class=no-num id="acknowledgments">Acknowledgments</h2>