Don't fail to keep browser running on an exception.
Deal with Firefox's "Your script is taking too long" type alerts.
Moving the raf stuff into a class rather then functions with gloabl state.
Use setTimeout to move to the next event to stop Firefox being unhappy.
Use a different method of hidding the elements which mean getComputedStyle still works.
In Firefox you can't set Event.prototype defined properties, instead use getters to override.
appendItem doesn't remove a segment from the previous path in Firefox.
Make the browser maximized and screenshots of failures nicer.
Ignore the png files generated by run-tests when tests fail.
Output a better error on bad JSON.
Reworking the test-runner state transitions to make both running and posting only allow one at a time.
Give the browser a moment to scroll before taking screenshot.
Only update the spacer once.
A little optimisating of the testcase grouping.
Fixing test-document-timline to actually test something.