Update spec for resolved issues

Fixes w3c#9365, w3c#9358 and w3c#9276.

Author: khushalsagar

css-view-transitions-1/Overview.bs

@@ -595,6 +595,8 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 	All of the [=view transition pseudo-elements=] are selected
 	from their [=ultimate originating element=], the [=document element=].
 
+	The [=view transition tree=] is not exposed to the accessibility tree.
+
 	<div class="example">
 		For example,
 		the ''::view-transition-group()'' pseudo-element is attached to the root element selector directly,
@@ -809,7 +811,17 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 	Therefore, the [=view transition layer=] is a sibling of all other content.
 
 	When a {{Document}}'s [=document/active view transition=]'s [=ViewTransition/phase=] is "`animating`",
-	the boxes generated by any element in that {{Document}} with [=captured in a view transition=] are [=invisible=].
+	the boxes generated by any element in that {{Document}} with [=captured in a view transition=]
+	and its [=element contents=],
+	except [=ViewTransition/transition root pseudo-element=]'s [=tree/inclusive descendants=],
+	are not painted (as if they had ''visibility: hidden'') and
+	do not respond to hit-testing (as if they had ''pointer-events: none'').
+
+	Note: Elements participating in a transition need to skip painting in their DOM location because
+		their image is painted in the corresponding ''::view-transition-new()'' pseudo-element instead.
+		Similarly, hit-testing is skipped because the element's DOM location does not correspond to where its contents are rendered.
+		However, there is no change in how these elements are accessed by assistive technologies or the accessibility tree.
+
 
 # User Agent Stylesheet # {#ua-styles}
 
@@ -1165,6 +1177,12 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 		: <dfn>old mix-blend-mode</dfn>
 		:: Null or a 'mix-blend-mode', initially null.
 
+		: <dfn>old backdrop-filter</dfn>
+		:: Null or a 'backdrop-filter', initially null.
+
+		: <dfn>old color-scheme</dfn>
+		:: Null or a 'color-scheme', initially null.
+
 		: <dfn>new element</dfn>
 		:: an [=/element=] or null. Initially null.
 	</dl>
@@ -1378,6 +1396,10 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 
 			1. Set |capture|'s [=captured element/old mix-blend-mode=] to the [=computed value=] of 'mix-blend-mode' on |element|.
 
+			1. Set |capture|'s [=captured element/old backdrop-filter=] to the [=computed value=] of 'backdrop-filter' on |element|.
+
+			1. Set |capture|'s [=captured element/old color-scheme=] to the [=computed value=] of 'color-scheme' on |element|.
+
 			1. Let |transitionName| be the [=computed value=] of 'view-transition-name' for |element|.
 
 			1. Set |namedElements|[|transitionName|] to |capture|.
@@ -1503,6 +1525,8 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 
 				1. Let |height| be |capturedElement|'s [=captured element/old height=].
 
+				1. Let |backdropFilter| be |capturedElement|'s [=captured element/old backdrop-filter=].
+
 				1. Set |capturedElement|'s [=captured element/group keyframes=] to a new {{CSSKeyframesRule}} representing the following CSS,
 					and append it to |document|'s [=document/dynamic view transition style sheet=]:
 
@@ -1513,6 +1537,7 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 								transform: <var>transform</var>;
 								width: <var>width</var>;
 								height: <var>height</var>;
+								backdrop-filter: <var>backdropFilter</var>;
 							}
 						}
 					</pre>
@@ -1763,7 +1788,7 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 
 		1. [=map/For each=] |transitionName| → |capturedElement| of |transition|'s [=ViewTransition/named elements=]:
 
-			1. Let |width|, |height|, |transform|, |writingMode|, |direction|, |textOrientation| and |mixBlendMode| be null.
+			1. Let |width|, |height|, |transform|, |writingMode|, |direction|, |textOrientation|, |mixBlendMode|, |backdropFilter| and |colorScheme| be null.
 
 			1. If |capturedElement|'s [=new element=] is null, then:
 
@@ -1781,6 +1806,10 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 
 				1. Set |mixBlendMode| to |capturedElement|'s [=captured element/old mix-blend-mode=].
 
+				1. Set |backdropFilter| to |capturedElement|'s [=captured element/old backdrop-filter=].
+
+				1. Set |colorScheme| to |capturedElement|'s [=captured element/old color-scheme=].
+
 			1. Otherwise:
 
 				1. Return failure if any of the following conditions is true:
@@ -1806,6 +1835,10 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 
 				1. Set |mixBlendMode| to the [=computed value=] of 'mix-blend-mode' on |capturedElement|'s [=new element=].
 
+				1. Set |backdropFilter| to the [=computed value=] of 'backdrop-filter' on |capturedElement|'s [=new element=].
+
+				1. Set |colorScheme| to the [=computed value=] of 'color-scheme' on |capturedElement|'s [=new element=].
+
 			1. If |capturedElement|'s [=captured element/group styles rule=] is null,
 				then set |capturedElement|'s [=captured element/group styles rule=] to a new {{CSSStyleRule}} representing the following CSS,
 				and append it to |transition|'s [=relevant global object's=] [=associated document=]'s [=document/dynamic view transition style sheet=].
@@ -1822,6 +1855,8 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 						direction: <var>direction</var>;
 						text-orientation: <var>textOrientation</var>;
 						mix-blend-mode: <var>mixBlendMode</var>;
+						backdrop-filter: <var>backdropFilter</var>;
+						color-scheme: <var>colorScheme</var>;
 					}
 				</pre>
 
@@ -1885,6 +1920,10 @@ Changes from <a href="https://www.w3.org/TR/2023/WD-css-view-transitions-1-20230
 * Add text-orientation to list of properties copied over to the ''::view-transition-group''. See <a href="https://github.com/w3c/csswg-drafts/issues/8230">issue 8230</a>.
 * Refactor the old capture algorithm to properly set [=captured in a view transition=] before reading the value.
 * Make the {{Document/startViewTransition()}} parameter non-nullable. See <a href="https://github.com/w3c/csswg-drafts/issues/9460">issue 9460</a>.
+* Elements participating in a [=view transition=] are exposed to accessibility tree. See <a href="https://github.com/w3c/csswg-drafts/issues/9365">issue 9365</a>.
+* The [=view transition tree=] is not exposed to accessibility tree. See <a href="https://github.com/w3c/csswg-drafts/issues/9365">issue 9365</a>.
+* Animate back-drop filter similar to transform/size. See <a href="https://github.com/w3c/csswg-drafts/issues/9358">issue 9358</a>.
+* Copy `color-scheme` from DOM element to ''::view-transition-group()''. See <a href="https://github.com/w3c/csswg-drafts/issues/9276">issue 9276</a>.
 
 <h3 id="changes-since-2022-05-25">
 Changes from <a href="https://www.w3.org/TR/2023/WD-css-view-transitions-1-20230525/">2022-05-25 Working Draft</a>