Please help with W3C validator

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My html validator is fine, but I have some issues in the css:

- 960_24_col.css (which I haven't edited at all): 1 .clearfix, .container_24 Property zoom doesn't exist : 1

Warnings:
- main.css: Property -webkit-border-radius is an unknown vendor extension (vendor extension??)
- main.css: Property -moz-border-radius is an unknown vendor extension
- reset.css (I haven't edited either): Property -ms-interpolation-mode is an unknown vendor extension

Then I have this message: "Family names containing whitespace should be quoted. If quoting is omitted, any whitespace characters before and after the name are ignored and any sequence of whitespace characters inside the name is converted to a single space." I understand the words but I don't know what are they talking about...

At the end they give me a "valid css", which I'd like to copy and paste but I don't know which css is.

PLEASE HELP

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ednella replied on at Permalink Reply
Errors fixed! Just warnings remaining... What is that about vendor extension??
VidalThemes replied on at Permalink Best Answer Reply
VidalThemes
A vendor prefix is something that was created by a specific browser, for example:

-ms-interpolation-mode (created by Microsoft )
- WebKit- (used by WebKit browsers safari and chome)
-moz- (used by Firefox)

They are not "wrong" it's just that because they are browser specific the w3c does not fully recognise them as they are not part of the CSS spec.
ednella replied on at Permalink Reply
Thank you Vidall. That makes sense.
I prefer to have those warnings then, because is better for the multi-platform concept