Web fixes.

internal/atspi/adapter_tree_native.go

@@ -250,6 +250,14 @@ func captureNativeTree(ctx context.Context, root *C.AtspiAccessible, reviewBusNa
 		// A visibility change can reveal children omitted by an earlier review
 		// capture, even when the provider emits no children-changed event.
 		cachedChildren := known && !cached.childrenInvalid && !cached.childrenUnavailable && (!reviewOnly || !cached.geometryInvalid)
+		if document && snapshot.Role == "internal frame" {
+			// Chromium can replace a sibling iframe document without an
+			// invalidation for its retained frame object. Refresh this boundary
+			// on recapture so a successful header action cannot leave the old
+			// content document pinned in either our cache or libatspi's cache.
+			cachedChildren = false
+			C.atspi_accessible_clear_cache_single(source)
+		}
 		childrenUnavailable := false
 		for _, id := range cached.children {
 			if cache.sources[id] == nil {