servo: Merge #7415 - Improve implementation of DOMRect and implement DOMRectReadOnly (from tschneidereit:dom-rect); r=nox

Passes most tests from test-css. The remaining ones should pass once we have https://github.com/w3c/csswg-test/pull/834.

r? @Ms2ger

Source-Repo: https://github.com/servo/servo
Source-Revision: 810d28a2574cd288ddfa5737ade417ea53a4b690

servo/python/tidy.py

@@ -413,6 +413,7 @@ def check_webidl_spec(file_name, contents):
         "//dvcs.w3.org/hg",
         "//dom.spec.whatwg.org",
         "//domparsing.spec.whatwg.org",
+        "//drafts.fxtf.org",
         "//encoding.spec.whatwg.org",
         "//html.spec.whatwg.org",
         "//url.spec.whatwg.org",