From the WebVTT spec: "Regardless of the value of the 'white-space' property, any line breaks inserted by the user agent for the purposes of line wrapping must be placed so as to minimize Δ across each run of consecutive lines between preserved newlines in the source. Δ for a set of lines is defined as the sum over each line of the absolute of the difference between the line's length and the mean line length of the set." e.g. avoid this: Hello World How Are You
<rdar://problem/12919735>
The obvious solution is: Hello World How Are You Kidding!
Or: |ello World How Are Yo| :-)