[webkit-dev] Removing support for the -khtml- (and -apple-?) vendor prefixes

Ryosuke Niwa rniwa at webkit.org
Mon Jul 12 09:00:30 PDT 2010

While converting all -khtml- properties to -webkit- may not be appropriate
because there could be incompatible implementation of certain property,
there are properties starting with -khtml- that are supposed to be supported
by WebKit.  See bugs such as https://bugs.webkit.org/show_bug.cgi?id=11825.
 Not supporting these will be a burden for some Web developers as they need
to add both -khtml- and -webkit- to specify one property.

Ryosuke Niwa

On Mon, Jul 12, 2010 at 1:53 AM, Peter Beverloo <peter at lvp-media.com> wrote:

> Good day,
> While going through WebCore for some CSS research I'm currently doing,
> I came across a piece of code[1] which translates all "-khtml-" and
> "-apple-" vendor-prefixes to "-webkit-". This effectively means
> "-apple-transform" and "-khtml-transform" can both be used instead of
> "-webkit-transform". I am unaware of the rationales behind the apple
> vendor-prefix, but I'd like to propose removing support for the
> KHTML-prefix.
> My main argument for this is that WebKit and KHTML are, in my opinion,
> two separate engines by two separate vendors. The port occurred eight
> years ago, and code in both projects has changed significantly ever
> since. When Microsoft announced support for "-webkit-text-size-adjust"
> in IE Mobile it was argued that browsers should not implement
> properties with prefixes "belonging" to other vendors, which seems to
> be exactly what WebKit is doing with the KHTML prefix.
> I understand the history of supporting -khtml-, and have heard from
> the KHTML project that they implement the -webkit- prefix as well.
> However, considering that WebKit has grown significantly in the past
> few years and that all code changes basically made KHTML and WebKit
> two individual rendering engines, with individual CSS support, I
> believe it would be appropriate for support to be dropped.
> Regards,
> Peter Beverloo
> http://peter.sh/
> [1] http://trac.webkit.org/browser/trunk/WebCore/css/CSSParser.cpp#L5583
> [2]
> http://blogs.msdn.com/b/iemobile/archive/2010/05/10/javascript-and-css-changes-in-ie-mobile-for-windows-phone-7.aspx
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