HTMLImageElement: isMap property - Web APIs | MDN
Value
A Boolean value which is true if the image is being used for a server-side image map; otherwise, the value is false.
Usage notes
When an image marked as being part of a server-side image map is clicked, the browser constructs the string "?x,y", where x and y indicate the coordinates at which the mouse was clicked as offsets from the top-left corner of the image, specified in CSS pixels.
The browser then fetches that URL from the server and displays or downloads it depending on the value of the download attribute.
Unlike server-side image maps, client-side image maps don't cause the <img> element to adopt interactive content mode.
Specifications
| Specification |
|---|
| HTML # dom-img-ismap |