mozilla/vtt.js — pull request #263 by RickEyre (2014-02-20 21:03:16+00:00)
Title: Wrap the cue in an anonymous div with inline positioning.

This functions as the cue background box and allows us to only
have the text have the background color. As well as allowing us
to use getClientRects() to get each line of text as a TextRectangle
which will allow us to get the exact line heights.

Fixes #230.