On 9/16/13 8:06 PM, Adam Kowalczyk wrote:
and it displays content from many third-party sources on a
single page

You probably want iframes for that....

The arguments so far have focused on code simplicity, lack of support in
other browsers, and Mozilla itself not using the feature.

Also performance improvements (arising from the simpler code).

I haven't seen anyone address the arguably most important question: is the 
feature
useful for the web at large?

It's not if we're the only one who ever supports it...

Perhaps we should improve our
implementation and push for its adoption

The other UAs have flat our refused to ever implement something like this. I can understand why. I wouldn't implement it in a new UA either (e.g. servo).

In principle, functionality provided by xml:base seems useful for web
applications that deal with third-party content.

I think using seamless/sandboxed iframes is the right way to deal with third-party content. Certainly pulling in untrusted third-party content directly is a security hole.

-Boris
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