Test that u, b, i WebVTT objects are being styled correctly.
EVENT(canplaythrough)
EVENT(seeked)
EXPECTED (getComputedStyle(cueNode).fontWeight == 'bold') OK
EXPECTED (getComputedStyle(cueNode).fontStyle == 'italic') OK
EXPECTED (getComputedStyle(cueNode).textDecoration == 'underline') OK
END OF TEST

