Created attachment 697450 [details] [diff] [review] patch
Get rid of the outparam, please.
Created attachment 697481 [details] [diff] [review] patch v2 Removed the useless outparam. According to the comment, the language attribute already lost the ability in HTML. > XUL doesn't support the language attribute And it looks like it was wrong.
I've added this bug to the compatibility doc. Please correct the info if I'm wrong. https://developer.mozilla.org/en-US/docs/Site_Compatibility_for_Firefox_21
(In reply to Kohei Yoshino from comment #6) > I've added this bug to the compatibility doc. Please correct the info if I'm > wrong. > https://developer.mozilla.org/en-US/docs/Site_Compatibility_for_Firefox_21 The language attribute in HTML used to ignore the JS version before this bug. This bug is just a cleanup for Web pages. On the other hand, XUL language attribute has changed the behavior. Therefore, this is a add-on compatibility bug (not site compatibility).
Oh, Okay. Removed this bug from the document.