JSFiddle - React, Tailwind, and code Playground

HTML

<div id="clipped" style="clip: rect(10px,10px,10px,10px);">huh</div>

JavaScript

function doSomething(v) {
    if (v instanceof Rect) {
        console.log("I'm a rect");
    }
    else {
        console.log("Go away");
    }
}
var el = document.querySelector("#clipped");
doSomething(getComputedStyle(el, null).getPropertyCSSValue("clip").getRectValue());