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[cssom-view-1] Add emulation for "Web-exposed screen information" with WebDriver BiDi. #13091

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[cssom-view-1] Add emulation for "Web-exposed screen information" with WebDriver BiDi. #13091

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[cssom-view-1] Add emulation for "Web-exposed screen information" wit…
lutien Nov 11, 2025
6e047c2
Update cssom-view-1/Overview.bs
lutien Nov 17, 2025
5f30842
Use separate hooks for available and total screen areas.
lutien Nov 17, 2025
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25 changes: 18 additions & 7 deletions cssom-view-1/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,9 @@ spec:css-borders-4; type:property; text:border-top-width
spec:css-borders-4; type:property; text:border-left-width
spec:cssom-view-1; type:dictionary; text:MouseEventInit
spec:cssom-view-1; type:dfn; for:MediaQueryList; text:media
spec:webdriver-bidi; type:dfn;
text:WebDriver BiDi emulated available screen area
text:WebDriver BiDi emulated total screen area
</pre>

<style>
Expand Down Expand Up @@ -413,16 +416,24 @@ protect the user's privacy. In order to do so in a consistent manner across APIs
defines the following terms, each having a width and a height, the origin being the top left
corner, and the x- and y-coordinates increase rightwards and downwards, respectively.

The <dfn export>Web-exposed screen area</dfn> is one of the following:
The <dfn export>Web-exposed screen area</dfn> must return the result of the following algorithm:

* The area of the output device, in <a lt=px value>CSS pixels</a>.
* The area of the <a>viewport</a>, in <a lt=px value>CSS pixels</a>.
1. Let <var>target</var> be [=this=]'s [=relevant global object=]'s [=Window/browsing context=].
1. Let |emulated screen area| be the <a>WebDriver BiDi emulated total screen area</a> of <var>target</var>.
1. If |emulated screen area| is not null, return |emulated screen area|.
1. Otherwise, return one of the following:
* The area of the output device, in <a lt=px value>CSS pixels</a>.
* The area of the <a>viewport</a>, in <a lt=px value>CSS pixels</a>.

The <dfn export>Web-exposed available screen area</dfn> is one of the following:
The <dfn export>Web-exposed available screen area</dfn> must return the result of the following algorithm:

* The available area of the rendering surface of the output device, in <a lt=px value>CSS pixels</a>.
* The area of the output device, in <a lt=px value>CSS pixels</a>.
* The area of the <a>viewport</a>, in <a lt=px value>CSS pixels</a>.
1. Let <var>target</var> be [=this=]'s [=relevant global object=]'s [=Window/browsing context=].
1. Let |emulated screen area| be the <a>WebDriver BiDi emulated available screen area</a> for <var>target</var>.
1. If |emulated screen area| is not null, return |emulated screen area|.
1. Otherwise, return one of the following:
* The available area of the rendering surface of the output device, in <a lt=px value>CSS pixels</a>.
* The area of the output device, in <a lt=px value>CSS pixels</a>.
* The area of the <a>viewport</a>, in <a lt=px value>CSS pixels</a>.


<h2 id=common-infrastructure>Common Infrastructure</h2>
Expand Down