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-rw-r--r--dom/chrome-webidl/WindowGlobalActors.webidl5
1 files changed, 5 insertions, 0 deletions
diff --git a/dom/chrome-webidl/WindowGlobalActors.webidl b/dom/chrome-webidl/WindowGlobalActors.webidl
index 7e202ee445..281f73f47b 100644
--- a/dom/chrome-webidl/WindowGlobalActors.webidl
+++ b/dom/chrome-webidl/WindowGlobalActors.webidl
@@ -58,6 +58,11 @@ interface WindowGlobalParent : WindowContext {
readonly attribute boolean isCurrentGlobal;
+ // This should return true if the window is currently visible in its tab.
+ // (A more technically accurate name would be something like
+ // "isActiveInRootNavigable".)
+ readonly attribute boolean isActiveInTab;
+
readonly attribute unsigned long long outerWindowId;
readonly attribute unsigned long long contentParentId;