Yes, it's a big improvement. The WebKitCSSMatrix implementation is actually compatible with both specifications: it provides getters and setters for elements a-

Yes, it's a big improvement. The WebKitCSSMatrix implementation is actually compatible with both specifications: it provides getters and setters for elements a-f as well as m11-m44, and serialises to "matrix(a, b, c, d, e, f)" if the matrix is affine.