Example:
Open a wikipedia page
Select a big paragraph
Resize the window to be much smaller so text wraps -- highlight stops working.

Select a big paragraph
Resize the window to be much larger to text wraps less -- highlight stops working, speech stops

it seems like  we shouldn't have a NodeGroupItem for each inlineTextBox at all, rather there should be one reference to the whole staticText, with a start/stop char. Then we can dynamically find the inlineTextBoxes inside that node as speech proceeds. Otherwise I think it'd be possible to skip inlineTextBoxes 

Also: Write a test for resizing a DOM element with a static text that's in the middle of speaking.