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-rw-r--r--dom/webidl/Document.webidl3
1 files changed, 3 insertions, 0 deletions
diff --git a/dom/webidl/Document.webidl b/dom/webidl/Document.webidl
index 0b8c278fe..904b1fb77 100644
--- a/dom/webidl/Document.webidl
+++ b/dom/webidl/Document.webidl
@@ -277,8 +277,11 @@ partial interface Document {
// https://w3c.github.io/page-visibility/#extensions-to-the-document-interface
partial interface Document {
+ [Pref="dom.visibilityAPI.enabled"]
readonly attribute boolean hidden;
+ [Pref="dom.visibilityAPI.enabled"]
readonly attribute VisibilityState visibilityState;
+ [Pref="dom.visibilityAPI.enabled"]
attribute EventHandler onvisibilitychange;
};