JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" value="append" onclick="clickappend()"/>



<div id="graph">
<svg height="100%" width="100%" viewbox="0 0 100 100">
                                
                                
 <polyline points="6,0 6,100" style="fill:none;stroke:#232323;stroke-width:0.5" />
    
    
    <polyline points="11,5 11,100" style="fill:none;stroke:#232323;stroke-width:0.5"/>
    
</svg>
</div>

JavaScript

function clickappend() {

$('#graph svg').append('<polyline points="20,0 20,100" style="fill:none;stroke:#232323;stroke-width:0.5"/>');
    alert('ran');
    
};