[webkit-dev] AX: Implement CSS -webkit-alt property (text alternative for generated content pseudo-elements ::before and ::after)

Adam Barth abarth at webkit.org
Fri Oct 4 13:22:16 PDT 2013

On Fri, Oct 4, 2013 at 12:08 PM, Dean Jackson <dino at apple.com> wrote:
> On 3 Oct 2013, at 4:46 am, Christian Biesinger <cbiesinger at chromium.org> wrote:
>> On Tue, Oct 1, 2013 at 8:26 PM, Ryosuke Niwa <rniwa at webkit.org> wrote:
>>> On Tue, Oct 1, 2013 at 4:53 PM, James Craig <jcraig at apple.com> wrote:
>>>> Follow-up question:  Since this hasn’t made it into the CSS4 spec yet,
>>>> should we temporarily use “-webkit-alt” for the property name? I know there
>>>> has been a push to move away from vendor prefixes lately, so if there are no
>>>> objections, I propose we use the unprefixed version.
>>> I think that's what Mozilla and Google are doing but I don't think we
>>> necessary have to follow the suit.
>> FYI, because IMO this is an important clarification - Mozilla and
>> Google use unprefixed versions only *behind a (runtime) flag*, until
>> the spec is stable. That way experimental features are not exposed to
>> the web at large until it is unlikely that the spec will change, to
>> avoid cross-browser compatibility risks.
> We decided on a slightly different approach, which is to prefix things
> but enable them by default in nightly builds. That way a port must still
> decide at their shipping time whether or not to enable the feature.
> In the Moz + Google case, the experimental form is exposed unprefixed to a small
> number of users on the Web. In our case, the experimental form is exposed
> prefixed. We concluded that we’ve changed things enough times while prefixed
> that it was worth the extra “this is experimental and may change” notice.

Does this imply that you'll remove the prefixes before shipping the
features in a production release?


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