HTML5 validation of image tags?

Drop the 'px' part Use only non-negative integers.

Drop the 'px' part. Use only non-negative integers.

I come from an XHTML background and am fond of px at the end. It seems normal. Why does it let me end the image tag with a short closing XML syntax, but doesn't let me specify px?

– Francisc Sep 12 '11 at 20:16 In previous versions of HTML, other units were supported but pixels were the default. The HTML5 specification drops (wisely, in my opinion) support for other units. Anything more complex should be handled in CSS.

– George Cummins Sep 12 '11 at 20:18 These tags never have had units, other than as a %. Remember that they are relics of the bad old days! W3.org/TR/1999/REC-html401-19991224/types.html#type-length – Rich Bradshaw Sep 12 '11 at 20:20 In XHTML 1.1 it is mandatory that you specify unit.

– Francisc Sep 12 '11 at 20:21 @Francisc: Can you provide a reference for that? – George Cummins Sep 12 '11 at 20:24.

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