JSFiddle - React, Tailwind, and code Playground

HTML

<title style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">MyTitle</title>

JavaScript

var titles = document.getElementsByTagName('title');
for (var i = 0; i < titles.length; i++) {
    if (titles[i].innerHTML == 'MyTitle') {
        console.log(titles[i].innerHTML);
        
        /* set new title */
        titles[i].innerHTML="New Title";
        
        var parent = titles[i].parentElement;
        console.log(parent.innerHTML);
        titles[i].innerHTML == '1215546162';
        console.log(titles[i].innerHTML);
    }
}