Yep! I really wanted this, but it's a bit more work. HTML5 canvas has a `measureText` method but it only returns width, so there's a few cases where the text will escape the box. The logic is really simple for now, but I'll hope to improve it in future.

Would you mind submitting an issue with a screenshot of your text not rendering correctly? https://github.com/geelen/typeslab/issues

Jason Davis explains how he gets the font size information for his d3.js word cloud here: http://www.jasondavies.com/wordcloud/about/

You might benefit from the same approach :)

Holy shit that's perfect. Gonna need to do some work to make sure it performs ok as you type, but that's just the sort of thing I was looking for!