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I'm test the extjs framework since 2 or 3 days. It is great!!! Thanks for it!
I checked the css with the http://jigsaw.w3.org/css-validator/ and get some errors in the files ext_all.css and ytheme-aero.css.
Sorry for maybe bad English...
That's very likely. The goal is to build pages and have CSS that renders consistently and works across different browsers. That however usually means that the CSS doesn't validate according to the W3C.
Thank you for your answer