[csswg-drafts] [css-sizing] Percentage margins and intrinsic sizes

fantasai has just created a new issue for 
https://github.com/w3c/csswg-drafts:

== [css-sizing] Percentage margins and intrinsic sizes ==
Testcase: 
http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=4345

Gecko renders as an author would expect: float is shrink-wrapped 
around its content with no overflow, and margins are 25% of their 
containing block. Blink and Edge overflow.

According to author > implementer > spec, we should all follow Gecko's
 lead here, but that requires buy-in from everyone else. :)

Please view or discuss this issue at 
https://github.com/w3c/csswg-drafts/issues/347 using your GitHub 
account