JSFiddle - React, Tailwind, and code Playground
HTML
<div id="div_id">By: Anonymous From Minnesota</div>
JavaScript
alert($('#div_id').html());
$('#div_id').html($('#div_id').html().substring(3));
<div id="div_id">By: Anonymous From Minnesota</div>
alert($('#div_id').html());
$('#div_id').html($('#div_id').html().substring(3));