JSFiddle - React, Tailwind, and code Playground

HTML

<div>
<input type="text" class="mariinsky" /><button id="inside">+</button>
</div>
<button id="outside">Button</button>
<br />
input value = <span></span>

JavaScript

$( '.mariinsky' ).on('keypress keyup keydown click copy cut paste',  function() {
    var bolshoi = jQuery( ".mariinsky" ).val();
    jQuery( 'span' ).text(bolshoi);
});