How can I add a ‘Click to Enlarge Image’ feature, with the enlarged image opening in a popup?

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I have several images of UI forms and tasks, that are quite large. I would like to display a smaller, ‘thumbnail’ image snf give the user an option to ‘Click to Enlarge’, and then display the fill size image in either a pop-up or separate window or tab. I pop-ups are frowned upon, but this is a decision I must still make.

How would I go about this? Where would I place the JavaScript that loads the full size image and opens a new window?

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