Don't tell stylo about stylesheets that are not in a browsing context (#35606)

* Don't register stylesheets outside of a browsing context with stylo

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Update WPT expectations

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

components/script/dom/document.rs

@@ -4413,12 +4413,12 @@ impl Document {
             })
             .cloned();
 
-        let cloned_stylesheet = sheet.clone();
+        if self.has_browsing_context() {
-        let insertion_point2 = insertion_point.clone();
+            self.window.layout_mut().add_stylesheet(
-        self.window.layout_mut().add_stylesheet(
+                sheet.clone(),
-            cloned_stylesheet,
+                insertion_point.as_ref().map(|s| s.sheet.clone()),
-            insertion_point2.as_ref().map(|s| s.sheet.clone()),
+            );
-        );
+        }
 
         DocumentOrShadowRoot::add_stylesheet(
             owner,
@@ -4439,10 +4439,11 @@ impl Document {
     /// Remove a stylesheet owned by `owner` from the list of document sheets.
     #[cfg_attr(crown, allow(crown::unrooted_must_root))] // Owner needs to be rooted already necessarily.
     pub(crate) fn remove_stylesheet(&self, owner: &Element, stylesheet: &Arc<Stylesheet>) {
-        let cloned_stylesheet = stylesheet.clone();
+        if self.has_browsing_context() {
-        self.window
+            self.window
-            .layout_mut()
+                .layout_mut()
-            .remove_stylesheet(cloned_stylesheet);
+                .remove_stylesheet(stylesheet.clone());
+        }
 
         DocumentOrShadowRoot::remove_stylesheet(
             owner,

tests/wpt/meta/html/rendering/non-replaced-elements/flow-content-0/slot-element-focusable.tentative.html.ini

@@ -1,5 +1,4 @@
 [slot-element-focusable.tentative.html]
-  expected: CRASH
   [slot element with display: block should be focusable]
     expected: FAIL
 

tests/wpt/meta/shadow-dom/MouseEvent-prototype-offsetX-offsetY.html.ini

@@ -1,4 +1,9 @@
 [MouseEvent-prototype-offsetX-offsetY.html]
-  expected: CRASH
   [MouseEvent's offsetX and offsetY attributes must be relative to the target.]
     expected: FAIL
+
+  [MouseEvent's offsetX and offsetY attributes must be relative to the shadow host when an event is dispatched inside its shadow tree.]
+    expected: FAIL
+
+  [MouseEvent's offsetX and offsetY attributes must be relative to the target when an event is dispatched on a slotted content.]
+    expected: FAIL

tests/wpt/meta/shadow-dom/ShadowRoot-interface.html.ini

@@ -1,25 +1,6 @@
 [ShadowRoot-interface.html]
-  expected: CRASH
   [ShadowRoot.activeElement must return the focused element of the context object when shadow root is open.]
     expected: FAIL
 
   [ShadowRoot.activeElement must return the focused element of the context object when shadow root is closed.]
     expected: FAIL
-
-  [ShadowRoot.innerHTML must return the result of the HTML fragment serialization algorithm when shadow root is open.]
-    expected: FAIL
-
-  [ShadowRoot.innerHTML must return the result of the HTML fragment serialization algorithm when shadow root is closed.]
-    expected: FAIL
-
-  [ShadowRoot.innerHTML must replace all with the result of invoking the fragment parsing algorithm when shadow root is open.]
-    expected: FAIL
-
-  [ShadowRoot.innerHTML must replace all with the result of invoking the fragment parsing algorithm when shadow root is closed.]
-    expected: FAIL
-
-  [ShadowRoot.styleSheets must return a StyleSheetList sequence containing the shadow root style sheets when shadow root is open.]
-    expected: FAIL
-
-  [ShadowRoot.styleSheets must return a StyleSheetList sequence containing the shadow root style sheets when shadow root is closed.]
-    expected: FAIL