IE support for attribute selectors with HTML5 doctype

Question

w3school\'s chapter on attribute selectors states that:

IE7 and IE8 support attribute selectors only if a !DOCTYPE is specified.

IE7

Answer 1

Note they aren't stating the HTML5 doctype but state it requires a doctype, though poorly worded. All new web pages are required to have a doctype so the point is moot. Use the HTML5 doctype because it puts all browsers into standards mode where you want to be.

As far as CSS goes, it's more important to know which properties the browser supports in the first place.