Created attachment 385618 [details] [diff] [review] patch SeaMonkey uses closebutton="true" on a tabs element, but with a custom binding like Firefox. closebutton="true" seems to be a leftover. DOMi uses closebutton="true" on a splitter element. It doesn't seem to do anything.
This isn't really interesting for theme authors, but XUL developers.
Why is it interesting for XUL developers? It seems like a theme issue to me.
This is about closebutton="true" in <tabs closebutton="true"/>. It's not supported anymore.
I'm still unclear on why this is interesting to XUL developers. Sorry...
I think it might be interesting to the ones who read https://developer.mozilla.org/en/XUL/tabs#a-closebutton, and put closebutton="true" in their tabs element, and then wonder where the closebutton that devmo promised them has gotten to.
Ah! See, the problem I had is I wasn't connecting the XBL to the element in my head for some reason. This is now fixed. https://developer.mozilla.org/en/XUL/Attribute/closebutton