Per Emilio's comment in uhttps://phabricator.services.mozilla.com/D9568#689590, it could be useful to add a way to `Document::InsertAnonymousContent()` to not notifying document. Currently, the method calls `InsertAnonContentIntoCanvas`, which always notifies document at [1]. [1] https://searchfox.org/mozilla-central/rev/7c20ad925005fbad7b8e08813115f1ec7fa1c248/dom/base/Document.cpp#5029
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Per Emilio's comment in https://phabricator.services.mozilla.com/D9568#689590, it could be useful to add a way to `Document::InsertAnonymousContent()` to not notifying document. Currently, the method calls `InsertAnonContentIntoCanvas`, which always notifies document at [1]. [1] https://searchfox.org/mozilla-central/rev/7c20ad925005fbad7b8e08813115f1ec7fa1c248/dom/base/Document.cpp#5029