[csswg-drafts] [css-images] linear-gradient syntax oopsie (#3781)

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

== [css-images] linear-gradient syntax oopsie ==
https://drafts.csswg.org/css-images-3/#linear-gradients defines linear gradients as  
`linear-gradient() = linear-gradient(  [ <angle> | to <side-or-corner> ]? , <color-stop-list>)`
but should probably define them as
`linear-gradient() = linear-gradient(  [ <angle> | to <side-or-corner> , ]? <color-stop-list>)`
because otherwise  
`linear-gradient(red,blue)`  
would be incorrect and
`linear-gradient(,red,blue)`
would need to be used.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/3781 using your GitHub account