From 402a60d918aefd0179743f4a9602296fc328a309 Mon Sep 17 00:00:00 2001
From: Alexandra Borovova <aborovova@mozilla.com>
Date: Tue, 11 Nov 2025 10:53:22 +0100
Subject: [PATCH 1/3] [cssom-view-1] Add emulation for "Web-exposed screen
 information" with WebDriver BiDi.

---
 cssom-view-1/Overview.bs | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/cssom-view-1/Overview.bs b/cssom-view-1/Overview.bs
index 987740ac605..89c2477e7e0 100644
--- a/cssom-view-1/Overview.bs
+++ b/cssom-view-1/Overview.bs
@@ -55,6 +55,7 @@ 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 screen area
 </pre>
 
 <style>
@@ -413,16 +414,24 @@ 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 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 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 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>

From 6e047c258c222aa41da26b68e302d8104b57a70f Mon Sep 17 00:00:00 2001
From: Alexandra Borovova <lutien@users.noreply.github.com>
Date: Mon, 17 Nov 2025 17:25:14 +0100
Subject: [PATCH 2/3] Update cssom-view-1/Overview.bs

Co-authored-by: Maksim Sadym <69349599+sadym-chromium@users.noreply.github.com>
---
 cssom-view-1/Overview.bs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cssom-view-1/Overview.bs b/cssom-view-1/Overview.bs
index 89c2477e7e0..50b24635bbe 100644
--- a/cssom-view-1/Overview.bs
+++ b/cssom-view-1/Overview.bs
@@ -417,7 +417,7 @@ corner, and the x- and y-coordinates increase rightwards and downwards, respecti
 The <dfn export>Web-exposed screen area</dfn> must return the result of the following algorithm:
 
 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 screen area</a> for <var>target</var>.
+1. Let |emulated screen area| be the <a>WebDriver BiDi emulated 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>.

From 5f30842b29bc43a321492cbbe2d4c8d9a7226fdb Mon Sep 17 00:00:00 2001
From: Alexandra Borovova <aborovova@mozilla.com>
Date: Mon, 17 Nov 2025 17:38:36 +0100
Subject: [PATCH 3/3] Use separate hooks for available and total screen areas.

---
 cssom-view-1/Overview.bs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/cssom-view-1/Overview.bs b/cssom-view-1/Overview.bs
index 50b24635bbe..96e6aa490e4 100644
--- a/cssom-view-1/Overview.bs
+++ b/cssom-view-1/Overview.bs
@@ -55,7 +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 screen area
+spec:webdriver-bidi; type:dfn;
+    text:WebDriver BiDi emulated available screen area
+    text:WebDriver BiDi emulated total screen area
 </pre>
 
 <style>
@@ -417,7 +419,7 @@ corner, and the x- and y-coordinates increase rightwards and downwards, respecti
 The <dfn export>Web-exposed screen area</dfn> must return the result of the following algorithm:
 
 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 screen area</a> of <var>target</var>.
+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>.
@@ -426,7 +428,7 @@ The <dfn export>Web-exposed screen area</dfn> must return the result of the foll
 The <dfn export>Web-exposed available screen area</dfn> must return the result of the following algorithm:
 
 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 screen area</a> for <var>target</var>.
+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>.