JSFiddle - React, Tailwind, and code Playground

HTML

Hello Techie, <b>I</b> am in bold.

JavaScript

window.find("I am");

var sel = window.getSelection(),
    frag = sel.rangeCount > 0 && sel.getRangeAt(0).cloneContents();

alert(frag && frag.querySelectorAll("b").length > 0);