Document.strictErrorChecking has never been implemented, and has been removed from Web DOM Core, we should remove it from the IDL as well. Patch coming up.
Created attachment 518067 [details] [diff] [review] Patch v1
Needs IID changes for things inheriting from nsIDOMDocument.
Documentation updated: https://developer.mozilla.org/en/DOM/document https://developer.mozilla.org/en/DOM_Levels#DOM_Level_3 Also mentioned on Firefox 6 for developers.