On 16/02/2017 06:51, Xidorn Quan wrote:
Tracking bug: https://bugzilla.mozilla.org/show_bug.cgi?id=903372

* It has been removed from the spec years ago.
* No other browser supports it.
* We pay performance penalty for it.
* It makes things trickier for stylo to handle URL values.

The tricky thing is that nsParserUtils::ParseFragment currently relies
on xml:base. That is going to be fixed in

Are there any objections?

No objection, just a caveat that this looks like it will affect Reader Mode, and there isn't great test coverage for this because Reader Mode itself already does URL rewriting in addition to what parsefragment does. bug 1280888 is relevant reading.

Furthermore, a question about how this relates to the HTML <base> element - is that going to continue to be supported and/or does it imply similar perf penalties / trickiness?

~ Gijs
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