On 5/10/16 3:05 PM, Jack Moffitt wrote:
We have the Chrome popularity data, and we have the Edge team's data
which covers the CSS spectrum quite well. I think it would be far more
useful to start covering the DOM API spectrum.
For example, it's pretty clear from existing data sources which CSS
properties Servo should focus on. But we have very little data for
which DOM APIs are important.
Interesting, my own interests are naturally skewed towards finding the
moz-isms and understanding how and when we can get rid of them (if
ever). But I can see how understanding DOM API usage is more relevant
when building a new browser engine.
What value does having even more CSS property data provide above and
beyond the value that can be extracted from the existing sources? Is
that value greater than the value we could extract by focusing on data
that doesn't currently exist?
I assume the answer to the first question is that it gives us data
that doesn't exist about -moz prefixed properties. Regarding the
second question, my opinion is that we can get a lot more benefit from
covering other areas than CSS. I'm curious to hear more informed
opinions on this than my own.
¿Porqué no los dos?
Right now no source of data will tell us if it's safe to remove
:-moz-dir() once we ship :dir(), for example.
https://bugzilla.mozilla.org/show_bug.cgi?id=1270406
And as Steve already replied, making decisions based on CSS (or JS)
served to browsers with different UA strings can be problematic. If
you're Safari Mobile, you'll end up with a lot more WebKit-isms than if
you're Fennec.
But yes, I absolutely agree we should Use Counter DOM APIs as well.
As to where this should live, it seems unfortunate that we would end
up with three repositories of data: Chrome's use counters, Edge's
platform status, and now a Mozilla one. Is it not possible to
consolidate this collection effort?
I don't have any strong opinions on where the data lives.
--
Mike Taylor
Web Compat, Mozilla
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