We need to render the favicon to the following sizes :
32x32, 192x192, 180x180, 270x270
Then add the following runes to the HTML header (with the proper URIs of course):
<link rel="icon" href="https://www.softwareheritage.org/wp-content/uploads/2015/08/cropped-swh-logo-32x32.png" sizes="32x32" /> <link rel="icon" href="https://www.softwareheritage.org/wp-content/uploads/2015/08/cropped-swh-logo-192x192.png" sizes="192x192" /> <link rel="apple-touch-icon-precomposed" href="https://www.softwareheritage.org/wp-content/uploads/2015/08/cropped-swh-logo-180x180.png" /> <meta name="msapplication-TileImage" content="https://www.softwareheritage.org/wp-content/uploads/2015/08/cropped-swh-logo-270x270.png" />