[webkit-dev] -khtml- and -apple- CSS prefixes

[Simon Fraser]

On Mar 9, 2013, at 5:02 PM, Maciej Stachowiak <mjs at apple.com> wrote:

> 
> On Mar 8, 2013, at 3:09 PM, Adam Barth <abarth at webkit.org> wrote:
> 
>> I've posted a patch to limit the -apple- and -khtml- CSS vendor
>> prefixes to ENABLE(DASHBOARD_SUPPORT):
>> 
>> https://bugs.webkit.org/show_bug.cgi?id=111890
>> 
>> My understanding is that I also need to add a runtime flag in order to
>> fully hide these prefixes from the web because Safari and Dashboard
>> share the same WebCore binary on Mac OS X.
>> 
>> I found the following entry in Settings.in:
>> 
>> usesDashboardBackwardCompatibilityMode initial=false,
>> conditional=DASHBOARD_SUPPORT
>> 
>> However, some of the paces we need to check this flag do not have easy
>> access to the Page and therefore have trouble finding the Settings
>> object.
>> 
>> Would it be possible to use a global static flag to hide these
>> prefixes from the web?  I don't understand the details of how Safari
>> and Dashboard share WebCore to know if a global static flag would work
>> correctly.
> 
> Safari and DashboardClient (the executable that actually renders widgets) link the same copy of WebCore on disk, but are separate executables at runtime. Dashboard backwards compatibility mode is triggered by the per-WebView _setDashboardBehavior: call which then sets the usesDashboardBackwardCompatibilityMode setting. It appears that any app using this SPI either sets it on all WebViews or none

I'm not sure that would be true for Dashcode. I could imagine that app setting Dashboard mode in its simulation views, but not in (say) a help viewing window.

Simon

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