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Possible Duplicate:
Is it OK to use unknown HTML tags?
I’ve tested a custom tag <oles-tag> ... </oles-tag> in Chrome and IE9.
I use HTML5 doctype <!DOCTYPE html>.
HTML5 does NOT support custom tags. The code won’t validate, but the browsers parses it anyway. I can even target it with CSS…
Why does browsers parse custom tags when it’s not standardized valid code?
And why shouldn’t I just use custom tags for the sake of semantic code?
To make it forward-compatible. Just imagine if it was impossible for you to style
<article>elements in old browsers because<article>didn’t exist when those old browsers were written. That’d be terrible, wouldn’t it? glares at IEBecause no one else (programs) recognizes those tags, therefore they’re not semantic. The reason why elements like
<article>are considered semantic is because they have an established use. When you use a custom element that doesn’t have an established use, it could be interpreted in a number of ways, leading to inconsistency among programs. glares at<b>and<i>