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I'm working on a large site’s re-write and redesign. I have been reading up on HTML 5 and wanted to know what the cons are before adopting it for this design implementation.
The design needs to work in A-grade browsers (yes including IE6 :( ), so I'm wondering how <footer> / <section> etc will be rendered (inline/block etc.).
I'd also like to know the pros so that I can sell it to any conservatives within the business.
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If we disregard the things which are unchanged since HTML 4.01…
Pros? Not a lot. There are a few things which work in a minority of browsers. There are a few things which work in a minority of browsers but with added JavaScript can support most browsers in a relatively sensible way.
As for cons…
It's useful as something to experiment with, but I wouldn't build a mainstream website with it.
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HTML5 isn’t one thing. There are some parts of HTML5 you can use right now.
For instance, you can change your doctype to the HTML5 one (<!doctype html>). Boom. Your document is now HTML5. Because the HTML5 spec was based on a lot of work figuring out what browsers already do, things like this just work. So, if you prefer the HTML5 syntax, feel free to do that now.
As for the new elements, as has been mentioned, they’re lacking support in IE. You can shim quite a lot of support for HTML5 into IE with JavaScript, if you’re happy with that. Note that unknown HTML elements are displayed as inline by all browsers, so you’d need to add display: block; for new block-level elements yourself for older browsers.
Dive into HTML5 is well worth a read to get you up to speed, particularly Chapter 3.
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Pros:
Cons:
The argument that the whole spec is still a draft doesn't really count. Just look at CSS. Even the latest changes to the CSS 2.1 recommendation still have draft status.
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If you want to use the HTML 5 specific elements, take a look at http://ejohn.org/blog/html5-shiv/. This approach allows you to use the HTML in browsers that don't support them now.
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