[webkit-dev] Use of -webkit- prefix on CSS Values and Properties

Darin Adler darin at apple.com
Mon Mar 28 12:21:55 PDT 2011

On Mar 27, 2011, at 10:37 AM, Dan Bernstein wrote:

> I think Eric is not asking about the unicode-bidi property, but rather about the isolate value, which is not in CSS 2.1. I don’t know that there’s a guideline, but there is precedent for prefixing values (for example, display: box and display: inline-box), so I would recommend prefixing the new unicode-bidi value as well.

The reason for prefixing is to be able to preserve compatibility if the meaning of “isolate” changes during the rest of the standardization process, but content relies on what we implement in WebKit.

We should add a prefix.

It will help us if the final “isolate” turns out to have a different meaning that it has in the current draft. Using the prefix gives us more options if that happens. We could keep our current meaning under the name “-webkit-isolate” if necessary. If things go well then “-webkit-isolate” will just be a synonym for “isolate”.

    -- Darin

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