Rebased existing tests onto new default fill behaviour
Make expectations more clear in source file
Replace container ids with the direction they represent
Ensure the longest string can fit in the test div
Removed hand coded incrementing IDs
Make tested fill value explicit in source HTML
Remove the need to duplicate anim divs for dur 0 and dur 1 by hand
Make direction more clear in source HTML
Add fill mode auto to existing fill test
Added test for fill mode auto on Animations and Timing Groups