Why do browser vendors make their own css properties?

Posted by jitendra on Stack Overflow See other posts from Stack Overflow or by jitendra
Published on 2010-03-13T06:26:56Z Indexed on 2010/03/13 6:45 UTC
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Filed under:

css

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browsers

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cross-browser

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standards

Why do browser vendors make their own css properties, even they know these will not pass the w3c validation?
What is the purpose? Is for their own testing, or for web developers, or to demonstrate browser capabilities to the world and to the W3C organizations and to CSS development team of W3C?
is it like a beta version of demonstration?
if i use any browser specific for now can they remove that property's support from future versions.will i have to edit my css in future

For example:

https://developer.mozilla.org/en/CSS_Reference/Mozilla_Extensions

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