Favicon:
<link rel="shortcut icon" type="image/x-icon" href="favicon.ico">
<link rel="icon" type="image/png" href="favicon-16x16.png" sizes="16x16">
<link rel="icon" type="image/png" href="favicon-32x32.png" sizes="32x32"><!-- Standard for most desktop browsers -->
<link rel="icon" type="image/png" href="favicon-128x128.png" sizes="128x128"> <!-- Chrome Web Store icon & Small Windows 8 Star Screen Icon -->
<link rel="icon" type="image/png" href="favicon-152x152.png" sizes="152x152"> <!-- iPad touch icon (Change for iOS 7: up from 144x144) -->
<link rel="icon" type="image/png" href="favicon-167x167.png" sizes="167x167"> <!-- iPad Retina touch icon (change for iOS 10: up from 152x152, not in action. iOS 10 will use 152x152) -->
<link rel="icon" type="image/png" href="favicon-180x180.png" sizes="180x180"> <!-- iPhone Retina -->
<link rel="icon" type="image/png" href="favicon-192x192.png" sizes="192x192"> <!-- Google Developer Web App Manifest Recommendation -->
<link rel="icon" type="image/png" href="favicon-196x196.png" sizes="196x196"> <!-- Chrome for Android home screen icon -->