JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="test" value="Test"/>

JavaScript

var test = document.getElementById('test');

function setText(x) {
    test.value = x;
}

getText = function() {      
    return test.value;
}
    
alert(getText());
setText("All your test are belong to me");
alert(getText());