1290093 - token-pasting using css variables

Status: NEW

(Core :: CSS Parsing and Computation, defect, P3)

Description

[Tom Tromey :tromey]

Attachment: css-token-paste.html

The attached test case consists of 3 divs.
The middle div has its background color set using:

#paste {
  --color: #ff0000;
  background-color: var(--color)aa;
}

Running this on firefox (fx-team from yesterday or so) shows that the
middle div has the same color as the final div, whose color is set as:

  <div style="background-color: #ff0000aa"></div>

That is, it appears that CSS variable substitution is pasting these
tokens together.

The spec is a bit vague on this, but my reading is that, because a variable
must consist of a valid token stream, the substitution must be done
using the tokens, and not using pasting.

Comment 1

[Sam Sneddon [:gsnedders]]

It's definitely the intention that the substitution happens on the token stream rather than on the character stream, though I agree the spec could be clearer.