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Analytic tools should record when their readers manually adjust font size, and give a hint to the developers that they need to fix their design.

Or the operators would just use it to record how many older/visually-challenged people are visiting their site and target ads towards them.

Analytic tools should record when their readers manually adjust font size

Interesting idea! Is that actually possible? Does increasing zoom (as in Chrome) actually affect any styles?

You can't get zoom level directly anymore, but you can monitor the "Device Pixel Aspect Ratio".

This tells you enough to know if the user zooms in /out.

I use stylebot chrome extension.

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