Text.isElementContentWhitespace is no longer part of the DOM standard.
WebKit does not support this attribute. I filed a bug on Opera for removing it there (along with replaceWholeText()).
Created attachment 560927 [details] [diff] [review] Patch v1
Comment on attachment 560927 [details] [diff] [review] Patch v1 Hrm.. this actually seemed like a useful function. It always feels silly to me when all browsers have to have state or functionality internally that isn't exposed to the webpage. So I'd be in favor of keeping this in spec/implementations. But if people prefer to remove it then I won't stand in the way.
The current name does not make any sense. I would be open to renaming it. E.g. Text.isWhiteSpace. I used an uppercase S for consistency with white-space in CSS.
I'd be fine with that.
I filed http://www.w3.org/Bugs/Public/show_bug.cgi?id=14443 on adding Text.isWhiteSpace to DOM4, but Simon rightly asks what the use case is and I have no idea.
I updated: https://developer.mozilla.org/en/Firefox_10_for_developers https://developer.mozilla.org/en/DOM/document.xmlEncoding https://developer.mozilla.org/en/DOM/document
Oops, wrong bug (sorry for the spam).
This time, I updated: https://developer.mozilla.org/en/Firefox_10_for_developer https://developer.mozilla.org/En/DOM/Text.isElementContentWhitespace https://developer.mozilla.org/En/DOM/Text