JSFiddle - React, Tailwind, and code Playground

HTML

<a onclick="something();">Click Me</a>
<br>
<a onclick="this.something();">And Me</a>
<br>
<a onclick="window.something();">Now Me</a>

JavaScript

window.something = function(){ 
    alert('global');
}
HTMLElement.prototype.something = function(){
    alert('element');
}