Area Highlight is a small script that parses a web-page for image maps and appends highlights to indicate where they are. Thier visibility is toggled by the "space bar" or other clicks on the image.

Add area-highlight.js and area-highlight.css from the "dist" folder to your project.

Link to both of them in each of your HTML files.

<link rel="stylesheet" type="text/css" href="path-to-file/area-highlight.css">
<script src="path-to-file/area-highlight.js" type="text/javascript"></script>