Fix broken link in CONTRIBUTING.md, close gh-1132.
Fix requirements and dependencies in README, close gh-1131.
Never use the XML as parsed by the XHR instance. Use raw text instead and let the ajax conversion logic do the trick. -20 min/gzipped. Fixes #13276. Unit test added.
Treat elements as hidden when either offsetWidth OR offsetHeight is 0. Fixes #13132, #10406.
Fix failing tests, add support for empty spans in Opera. Supplements #13132, #10406.
Ignore file inputs when serializing forms. File input serialization is handled by plugins. Fixes #13306.