message: fix mrege mistake
diff: "exposed": "Window",
  "properties": {
  "property": {
  - "x": {
  - "name": "x",
  - "read-only": 1,
  - "override-type": "SVGAnimatedLength"
  - },
  - "y": {
  - "name": "y",
  - "read-only": 1,
  - "override-type": "SVGAnimatedLength"
  - },
  "targetElement": {
  "name": "targetElement",
  "read-only": 1,
  