When attempting in NW.js 0.47.1 I could not find any means of modifying the window icon displayed in the top left of the native Windows 10 title bar, or in the task bar.

Attempted accessing it via nw.Window.get(), in various places in the nw object, and also with @djmisterjon's approach:

<!DOCTYPE html>
<html>
  <head>
    <link id="dynamic-favicon" rel="icon" type="image/x-icon" href="favicon.ico">
  </head>
  <body>
    <script>
      function changeFavicon (src) {
        let head = document.head || document.getElementsByTagName('head')[0];

        let newLink = document.createElement('link');
        newLink.id = 'dynamic-favicon';
        newLink.rel = 'icon';
        newLink.type = 'image/x-icon';
        newLink.href = src;

        let currentLink = document.getElementById('dynamic-favicon');
        if (currentLink) {
          head.removeChild(currentLink);
        }

        head.appendChild(newLink);
      }

      setTimeout(function () {
        changeFavicon('http://www.google.com/favicon.ico');
      }, 5000);
    </script>
  </body>
</html>

None worked. I don't think modifying the icon after the window has launched is possible without closing and launching a new window.

@rogerwang can you confirm?

Setting the window icon dynamically #7556

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