@xiee/utils/js/load-typekit.js

Miscellaneous tools and utilities to manipulate HTML pages

(d => {
  // https://www.kirupa.com/html5/detect_whether_font_is_installed.htm
  const canvas = d.createElement("canvas"), context = canvas.getContext("2d"),
    text = "abcdefghijklmnopqrstuvwxyz0123456789";
  context.font = "72px monospace";
  const size = context.measureText(text).width;
  for (let font of [' SC', ' CN', ' TC', ' TW', '']) {
    context.font = `72px 'Source Han Serif${font}', monospace`;
    // no need to load TypeKit if Source Hans Serif has been installed
    if (context.measureText(text).width != size) return;
  }
  let config = {kitId: 'kwz5xar', scriptTimeout: 3000, async: true},
  h=d.documentElement,t=setTimeout(function(){h.className=h.className.replace(/\bwf-loading\b/g,"")+" wf-inactive";},config.scriptTimeout),tk=d.createElement("script"),f=false,s=d.getElementsByTagName("script")[0],a;h.className+=" wf-loading";tk.src='https://use.typekit.net/'+config.kitId+'.js';tk.async=true;tk.onload=tk.onreadystatechange=function(){a=this.readyState;if(f||a&&a!="complete"&&a!="loaded")return;f=true;clearTimeout(t);try{Typekit.load(config)}catch(e){}};s.parentNode.insertBefore(tk,s)
})(document);