I am looking for existing codes for magnifying pre-defined portions of text in PDF the output of LaTeX. The applications is for accessibility for the visually impaired, so from users' point of view minimizing number of clicks and mouse movements is essential. From content providers' point of view simplicity of coding is important. A feature like the one MathJax has is desirable: set magnification factor, activate by mouse over, deactivate by mouse away, or similar settings. I am aware of the following Hover and ZoomBox. Any pointer is appreciated.
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2To me, it looks like a problem you should solve in the PDF viewer, not in (La)TeX. – Federico Poloni Apr 13 '12 at 10:55
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This looks like a viewer issues, as @FedericoPoloni says. As such, and especially without a clue as to the viewer in question, I think this is off-topic. – Joseph Wright May 06 '12 at 08:09