On Feb 17, 2013, at 1:09 AM, Filip Pizlo <fpi...@apple.com> wrote:

> 
> On Feb 17, 2013, at 1:04 AM, Dirk Schulze <dschu...@adobe.com> wrote:
> 
>> 
>> The discussion on each single feature let us forget the greater scope of 
>> this problem. That is why I did not start with a concrete example.
>> 
>> What about going another direction? Right now we have compiler flags for a 
>> lot of new features. What if we turn this around? Why not having a compiler 
>> flag ENABLE_DEPRECATED_FEATURES? This must be turned on in trunk to make 
>> sure deprecated features still work properly. Release builds should turn it 
>> on to not break compatibility. But every binary build of a nightly or 
>> preview has it turned off. A lot of developers experiment with Chrome Canary 
>> and WebKit nightlies already. It might be a drop in the bucket, but still 
>> can have some influence on decreasing the use of deprecated content. 
>> Features like CSS gradients, transitions and animations might be good 
>> candidates at the beginning for this flag.
> 
> This carries the risk of decreasing test coverage of Nightlies and Canaries.  
> I don't think that is acceptable.
> 
> Users who download them and cannot use a web page because that page had 
> deprecated features will then not be able to experience what bugs we had, 
> those deprecated features notwithstanding.
> 
> I empathize with the desire to remove cruft.  But we shouldn't remove things 
> if it breaks the web, even in Nightlies and Canaries.

I agree with Phil. And as a corollary, if removing something *doesn't* break 
the Web and we think it's otherwise bad, then there's no need to do a special 
dance with nightlies before removing.

Cheers,
Maciej

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