対youpy.css cssonoff

cssonoff.js

function cssonoff(s) {
  var ns = document.querySelectorAll("style");
  [].forEach.call(ns, function (n) {
    n.disabled = s;
  })
  var xs = document.querySelectorAll("link");
  [].forEach.call(xs, function (x) {
    if (x.rel.match(/stylesheet/i)) {
      n.disabled = s;
    }
  })
}

HTMLStyleElement - MDN
HTMLLinkElement - MDN