Does IE8 support HTML5 and CSS3?

I have requirement where the client needs their website to be developed in html5 and css3. However it seems like ie6, ie7 don't support HTML5 and CSS3. The client said that HTML5 and CSS3 is supported in ie8, but I need开发者_JAVA技巧 to know to which degree it is actually supported.

• No browser supports all of HTML 5 or CSS 3
• Many browsers (including IE8) support some features added in HTML 5 or CSS 3
• All browsers support some of HTML 5
• All mainstream graphical browsers support some of CSS 3

Worry about what you want to achieve, then look for the optimal way to achieve it. Don't start with the tools available and then try to find a use for them.

Develop for the lowest common denominator and then progressively enhance from there.

Try to look at caniuse or html5test websites.

IE8 supports nothing of HTML5, that wasn't part of HTML4, since it was developed, before HTML5 became even a W3C draft.

CSS3: There is the one or other property, that didn't make it in CSS 2.1, that IE8 actually supports, like text-wrap. However, it's not worth mentioning it. Especially all the goodies like box shadows and rounded corners don't exist in IE8.

Look at the links in yojimbo87's answer for more details on supported properties.

What is worse, is that even IE9 doesn't support that much of HTML5. They focused on canvas, video and audio and claim it now to be "HTML5 ready". But, for example, all the new form fields are completely missing, not speaking of lots of new JavaScript APIs.

So, to put it in a nutshell, no, IE8 doesn't support HTML5. It can, however, display HTML5 documents, since the specification is written with fallback options for older browsers in mind.

ie6 & ie7 have almost no support for html5 & css3.

Take a look at Quirksmode's compatibility table at: http://www.quirksmode.org/compatibility.html

If you need to develop in html5 I would recommend taking a look at Modernizr. It is a javascript library that tests the users's browser and modifies the html/css to suit it's capabilities.
http://www.modernizr.com/

The HTML5 specification is still in development phaze. You can try selling a client stuff, that is not yet developed. As with InternetExplorer, then no, it supports just about 5% of HTML5 current specs.

HTML5 and CSS3 is not supported to a great extent on IE8. I would suggest you to use Firefox 4 from the 'Gecko' browser family or Google chrome or Safari (if you are on MacOSX) from the 'Webkit' browser family. They have great support for HTML5. Although I haven't tried it myself, I hear IE9 has excellent support for HTML5. But it runs only on Windows 7.

Firefox or Chrome would be my choice though.

With current browser support of HTML5 and CSS3, your client must either a) be insane or b) not know what they're on about. While it is true that HTML5 and CSS3 are gaining support pretty quickly, the majority of browsers don't have good support for the more advanced features of the two techs, for example, <audio> and <video> aren't too widely supported. Neither is <canvas>. As for CSS3, quite a few bits of it are supported well, but IE users will have to do without.

As an additional note, IE6 is still in very heavy use in China, so if you're targeting that market, stick with the older, better supported technologies.

Actually IE-8 support HTML-4, its better to use chrome,firfox or sefari for HTML-5. More you can see here