Responsive image map

For responsive image maps you will need to use a plugin:

https://github.com/stowball/jQuery-rwdImageMaps (No longer maintained)

Or

https://github.com/davidjbradshaw/imagemap-resizer

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No major browsers understand percentage coordinates correctly, and all interpret percentage coordinates as pixel coordinates.

http://www.howtocreate.co.uk/tutorials/html/imagemaps

And also this page for testing whether browsers implement

http://home.comcast.net/~urbanjost/IMG/resizeimg3.html