Why does a rect require width and height attribute in Firefox?

Question

In the following example I created a blinking eyes animation using CSS and an SVG: http://codepen.io/JamesTheHacker/pen/oLZVrY

It works fine in chrome, but on Firefox th

Answer 1

• In SVG 1.1 height and width are attributes i.e. you can't set the height and width via CSS.
• In SVG 2 it is proposed width and height should be CSS properties.

Only Chrome has so far implemented this part of the unfinished SVG 2 specification.