JS visualizer

you may want to look at chris iufer's loupe, which is only a bit bigger than mine and includes a few samples that use css3 to achieve a round loupe:

I guess the easiest way to do this is to use CSS3 border-radius, which is supported by the modern versions of all web-browsers (no IE lower than version 9).

Please note that this is a question about the library linked above. I have already googled for other libraries. I want to keep the js as small as possible.

Loupejs

This calculator is a tool.  These calculations are based upon theoretical values and are only intended for planning purposes. Actual results will vary. No responsibility from 6gTools LLC is assumed.

whereas mine uses an absolutely positioned image within a div, his uses background-image on the div and background-position to move the image, so css3 border-radius works.