issue: we override the positionAlign on VTTCue with no excepted values, so Firefox ignores other values and keep its default value - 'auto'
fix: changed the configuration to use the excepted values, (and keep the old ones for backward compatibility)
solves: FEC-12991
CheckLists
[x] changes have been done against master branch, and PR does not conflict
[ ] new unit / functional tests have been added (whenever applicable)
[ ] test are passing in local environment
[ ] Travis tests are passing (or test results are not worse than on master branch :))
Description of the Changes
issue: we override the positionAlign on VTTCue with no excepted values, so Firefox ignores other values and keep its default value - 'auto' fix: changed the configuration to use the excepted values, (and keep the old ones for backward compatibility)
solves: FEC-12991
CheckLists