LGTM
http://gwt-code-reviews.appspot.com/1422816/diff/8001/user/src/com/google/gwt/user/client/DocumentModeAsserter.java File user/src/com/google/gwt/user/client/DocumentModeAsserter.java (right): http://gwt-code-reviews.appspot.com/1422816/diff/8001/user/src/com/google/gwt/user/client/DocumentModeAsserter.java#newcode69 user/src/com/google/gwt/user/client/DocumentModeAsserter.java:69: + currentMode + "' is not one of: " + Arrays.toString(allowedModes); We should give the user better instructions here. "Change the doctype at the top of you applications host html page to one of " + Arrays.toString(allowedModes) + ". Or, add the following line to your gwt.xml file to continue using quirks mode, but understand that GWT no longer supports Quirks mode: <extend-property name=\"document.compatMode\" values=\"BackCompat\"/>" http://gwt-code-reviews.appspot.com/1422816/ -- http://groups.google.com/group/Google-Web-Toolkit-Contributors
