PLEASE do not use this. Yes, the ideal ("most legible") width for a column of text is ~60 characters, no question. But that's only once you've chosen the most legible font size . You're supposed to adjust your column width to fit an appropriate number of characters, not adjust the font size to your column width! Adjusting the font size is completely backwards, and worst of all, it's breaking my browser zoom , so it's…
While that may not matter as that is a rare case, if I am using a javascript library to control my font size (which is ridiculous if you ask me, but let's ignore that) I don't ever want it to go below 10px's. And there are tons of different Android screen sizes, so this is a possibility.