Twenty Twelve: Background gradient argument

[man4toman]

The first argument of the linear-gradient should be 'to top', not 'top'.

[ianbelanger]

Thanks @man4toman,

The patch seems to address all linear-gradient rules in the CSS. I am marking this for commit.

BTW, the Version tag is for the version in which this issue was introduced, not for the version tested against.

Related #46770

[joyously]

The patch doesn't actually fix the problem, because this ticket was just written for syntax. The real problem is that the old syntax goes the other direction from the new syntax.
For example,
-webkit-linear-gradient(top, #f4f4f4, #e6e6e6);
will start at top with #f4f4f4 and go down to #e6e6e6. But
linear-gradient(to top, #f4f4f4, #e6e6e6);
will start at bottom with #f4f4f4 and go to top to #e6e6e6.

[ianbelanger]

Changes gradient direction in linear-gradient

[ianbelanger]

Thanks for pointing that out @joyously, my updated patch changes the direction of the gradient to to bottom in linear-gradient

[SergeyBiryukov]

In 45124:

Twenty Twelve: Correct linear-gradient direction argument syntax.

In CSS, the linear-gradient function requires that the direction value explicitly use to instead of an implicit from.

Props: ianbelanger, joyously, man4toman.
Fixes #46786.