User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.70 Safari/537.17 Steps to reproduce: ProgressEvent CR (http://www.w3.org/TR/progress-events/) test - Test wiki: http://www.w3.org/wiki/Webapps/Interop/ProgressEvents - Test suite: http://w3c-test.org/webapps/ProgressEvents/tests/ - Test case: http://w3c-test.org/webapps/ProgressEvents/tests/submissions/Ms2ger/interface.html (1) The ProgressEvent interface Actual results: Test case failed: ProgressEvent.length returns undefined. Expected results: ProgressEvent.length returns 2. http://www.w3.org/TR/progress-events/#interface-progressevent

Thanks for the bug, Jungkee! I realized that the length should be 1 rather than 2 because of a change in WebIDL (to match how .length works with optional arguments in ES6), and fixed the test: <https://dvcs.w3.org/hg/webapps/rev/1b7995888e77>. This bug will be fixed by bug 776864, when it lands.