Tests default DOM layout structure for a VTTRegion.


EVENT(canplaythrough)
** The text track has only one region **
EXPECTED (testTrack.regions.length == '1') OK

** Inspecting the default DOM layout used for regions display **

** Only one region should be displayed **
EXPECTED (region.children.length == '1') OK

** The child of the region should be the container **
EXPECTED (region.children[0] == container == 'true') OK

** Default pseudo IDs should be set properly
EXPECTED (region.getAttribute('pseudo') == '-webkit-media-text-track-region') OK
EXPECTED (container.getAttribute('pseudo') == '-webkit-media-text-track-region-container') OK
END OF TEST