function composeCssTransform(dx1, dy1, sx, sy, angle, dx2, dy2) {
  return toString(compose(create(), dx1, dy1, sx, sy, angle, dx2, dy2));
}
Creates a composite transform given an initial translation, scale, rotation, and
final translation (in that order only, not commutative). The resulting transform
string can be applied as `transform` property of an HTMLElement's style.
@param {number} dx1 Initial translation x.
@param {number} dy1 Initial translation y.
@param {number} sx Scale factor x.
@param {number} sy Scale factor y.
@param {number} angle Rotation (in counter-clockwise radians).
@param {number} dx2 Final translation x.
@param {number} dy2 Final translation y.
@return {string} The composite css transform.
@api