JSFiddle - React, Tailwind, and code Playground
by Paulpro
HTML
<input id="update-skin-name" type="text" value="535" /><input id="update-skin-button" type="button" value="Update" />
<br />
<applet code="net.minecraft.skintest.ModelPreviewApplet"
archive="http://www.minecraft.net/skin/skintest.jar" codebase="."
width="320" height="320">
<param id="skin-value" name="name" value="535" />
</applet>
JavaScript
document.getElementById('update-skin-button').onclick = function(){
document.getElementById('skin-value').setAttribute('value', document.getElementById('update-skin-name').value);
};