Dynamically load google fonts after page has loaded

Check out the WebFont.load command in this github repo:

https://github.com/typekit/webfontloader

You can load whatever font you want dynamically:

 <script src="http://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js"></script> 
  <script> 
        WebFont.load({
                    google: { 
                           families: ['Droid Sans', 'Droid Serif'] 
                     } 
         }); 
   </script>

Or if you don't want third party libs :

function addStylesheetURL(url) {
  var link = document.createElement('link');
  link.rel = 'stylesheet';
  link.href = url;
  document.getElementsByTagName('head')[0].appendChild(link);
}

// Load Tangerine & Cantarell
addStylesheetURL('https://fonts.googleapis.com/css2?family=Cantarell&family=Tangerine&display=swap');
    h1 {
      font-family: 'Cantarell', sans-serif;
    }
    p {
      font-family: 'Tangerine', cursive;
      font-size: 30px;
    }
<!DOCTYPE html>
<html>
  <head>
    <title>Dynamically load google fonts after page has loaded</title>
    <link rel="preconnect" href="https://fonts.gstatic.com">
  </head>
  <body>
    <h1>Dynamically load google fonts after page has loaded</h1>
    <p>Some text.</p>
  </body>
</html>

// Load font:

  const fontName = 'Roboto';
  const link = document.createElement('link');
  link.rel = 'stylesheet';
  link.href = `https://fonts.googleapis.com/css?family=${fontName}`;
  document.head.appendChild(link);

// Set font on body element with Javascript:

  document.body.style.fontFamily = fontName;