JSFiddle - React, Tailwind, and code Playground

HTML

<map name="testmap">
    <area id="testarea" shape="rect" coords=".90, .90, 100, 100" href="#" alt="">
</map>
    
    <img src="http://placehold.it/100/100" alt="" usemap="#testmap">

JavaScript

alert(document.getElementById("testarea").coords);