JSFiddle - React, Tailwind, and code Playground

HTML

<div id="lahdshjasddivId">asdasd</div>
<div id="lahdshjasddd">sfsdfdsf</div>
<div id="divId">asdasdads</div>

JavaScript

var arrDivs = document.getElementsByTagName('div'),
    strDivName = "divId";

for (i=0;i<=arrDivs.length;i++){
    var divBuffer = arrDivs[i]
    if( divBuffer.id.indexOf(strDivName) != -1) {
        divBuffer.innerHTML = "<b>i am a divId div</b>" 
    }
}