https://www.lunion.fr/sites/all/themes/enabootstrap/js/cssrelpreload.min.js

1!(function(t) {
2  'use strict';
3  t.loadCSS || (t.loadCSS = function() {});
4  var e = (loadCSS.relpreload = {});
5  if (
6    ((e.support = (function() {
7      var e;
8      try {
9        e = t.document.createElement('link').relList.supports('preload');
10      } catch (t) {
11        e = !1;
12      }
13      return function() {
14        return e;
15      };
16    })()),
17    (e.bindMediaToggle = function(t) {
18      var e = t.media || 'all';
19      function a() {
20        t.media = e;
21      }
22      t.addEventListener
23        ? t.addEventListener('load', a)
24        : t.attachEvent && t.attachEvent('onload', a),
25        setTimeout(function() {
26          (t.rel = 'stylesheet'), (t.media = 'only x');
27        }),
28        setTimeout(a, 3e3);
29    }),
30    (e.poly = function() {
31      if (!e.support())
32        for (
33          var a = t.document.getElementsByTagName('link'), n = 0;
34          n < a.length;
35          n++
36        ) {
37          var o = a[n];
38          'preload' !== o.rel ||
39            'style' !== o.getAttribute('as') ||
40            o.getAttribute('data-loadcss') ||
41            (o.setAttribute('data-loadcss', !0), e.bindMediaToggle(o));
42        }
43    }),
44    !e.support())
45  ) {
46    e.poly();
47    var a = t.setInterval(e.poly, 500);
48    t.addEventListener
49      ? t.addEventListener('load', function() {
50          e.poly(), t.clearInterval(a);
51        })
52      : t.attachEvent &&
53        t.attachEvent('onload', function() {
54          e.poly(), t.clearInterval(a);
55        });
56  }
57  'undefined' != typeof exports
58    ? (exports.loadCSS = loadCSS)
59    : (t.loadCSS = loadCSS);
60})('undefined' != typeof global ? global : this);