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    where could I in specifications find exact date when HTML5 + CSS3 started as official and valid for use?


    They aren’t final specifications yet, they are still working drafts. So to answer your question, not yet :)


    I don’t think you ever will – CSS 2.1 isn’t supported 100% by browser still supported today *cough* IE7 *cough*.

    I think if you make use of feature detection and style accordingly, you’ll be pretty safe. As for things like drop-shadows and rounded corners… I may give IE some kind of border (instead of a drop shadow) but they definitely get square corners. I don’t think anyone really cares. I may be wrong, but I’ve never received complaints from clients. I did one time and I explained that twitter, facebook, myspace, etc all do this and it’s common practice ( true story ) and they listened to what I had to say and said I could leave it the way it was.

    As for HTML5 – That’s a large playground :p I use form properties and values, like <input type=”email” /> all the time – The fallback is brilliant. But you’d definitely still need backend validation and perhaps front-end validation for browsers without the features.

    If the site works well in all sites, you can safely use HTML5 + CSS3.



    so lets say I want to put it in my resume
    I am interested in it last 2 years, would that be ok?

    that is why I asked some date, cant remeber first time I started with css3, html5


    I would talk about browser optimization and efficiency as well as page load time. CSS3 + HTML5 contribute to that by replacing things like javascript and images ( in some cases ).

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