JSFiddle - React, Tailwind, and code Playground

HTML

<a href="javascript:window.onclick=function(){return false;},window.onsubmit=function(){return false;},window.onbeforeunload=function(){return 'Page Protection is enabled';};" id="bookmarklet">Page Protector!</a>
<br>Drag this to your bookmarks bar or right-click and add to bookmarks.

CSS

body {font-family:Arial;}
#bookmarklet {
    display:block; 
    font-size:1.4em; 
    padding:6px; 
    background-color:#AAFFAA; 
    border:3px solid #00AA00; 
    font-weight:bold; 
    color:#00AA00; 
    width:165px; 
    text-align:center;
}