IE11 devtools - add/reload a stylesheet

gistfile1.txt

var existingLink = document.querySelector('link[data-custom-css]'); 
if (existingLink) { existingLink.parentNode.removeChild(existingLink); }
var link = document.createElement('link');
link.setAttribute('data-custom-css', '1');
link.rel = 'stylesheet';
link.href = '/xxxxxxxxxxxxxxxxxxxxxxxx.css?'+Math.floor(Math.random()*10000);
document.querySelector('head').appendChild(link);