[whatwg] Correcting some misconceptions about Responsive Images

[Chris Heilmann]

<img src=data: srcset="foo.jpg 1x, foo2.jpg 2x" 
style="display:none;"><noscript><img src="foo.jpg"></noscript>

So we praise the terse syntax of it and then offer a NOSCRIPT for 
backwards compatibility? Now that is a real step back in my opinion.