[css-images-5] 2D gradients first draft #7648 - #14655

• Existing gradients are called out as 1D gradients because they have a concept of a 'gradient line'. 2D gradients do not use that concept. Is that a confusing way to make the distinction, since even 1D gradients are still rendered on a 2D gradient box?

That seems reasonable to me, if the dimensions are not seen as dimensions on the image but rather, dimensions in how the gradient is specified. (The existing term gradient line can be a little confusing until this concept is grasped, because for conic gradients the line can be a spiral on the image space; but it is still a line where the color at any point is specified by a single progress along that line).

Given that, the two new gradients are indeed 2D gradients; the 2D position determines the color.