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I tried validating my CSS using both validators and they give different results!
http://www.css-validator.org/ returns much more errors (245 in my case) than http://jigsaw.w3.org/css-validator/ (which returned 24 errors).
What is the difference between these to? Aren't they both under W3C?
Options I used for http://jigsaw.w3.org/css-validator/:
I also tried changing Vendor extensions value, if I set it to Errors I get about 100 errors, if I set it to warnings I get same amount of errors as when default, which is 24.
Options I used for http://www.css-validator.org/:
Examples of errors not returned by css-validator.org but not by jigsaw.w3.org:
- ".kill-flicker: Property backface-visibility doesn't exist : hidden hidden"
- ": Unknown pseudo-element or pseudo-class ::-moz-focus-inner [-moz-focus-inner]"
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A CSS validator checks your Cascading Style Sheets to make sure that they comply with the CSS standards set by the W3 Consortium. There are a few validators which will also tell you which CSS features are supported by which browsers (since not all browsers are equal in their CSS implementation).
A vendor specific extensions can start with a “-” (dash) or a “_” (underscore), usually followed by an abbreviation of the company or the browser project the extension is specific for, f.i. “-moz-” for Mozilla browsers, or “-webkit-” for WebKit based browsers.
http://jigsaw.w3.org/css-validator/ is hosted by the W3C. It’s the official CSS validator, linked from http://validator.w3.org/.
http://www.css-validator.org/ is not hosted by the W3C (*). It’s misleading because they use the same branding (almost identical site copy, except for additional advertisement/Facebook widget).
They may or may not use the same validator code, as the code is FLOSS.
* as confirmed by a (back then) W3C staff member
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