JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" onclick="search()" value="search" />

<li>Java</li>
<li>VB</li>
    <li>Javascript</li>

JavaScript

function search()
{
    var lis = document.getElementsByTagName("li");

    for(var i=0;i<lis.length;i++)
    {
        if(lis[i].innerHTML.indexOf("Java") > -1)
           lis[i].style.color = 'red';
    }
}