Google Calendar PWA manifest

gcal pwa manifest.txt

const startUrl = 'https://calendar.google.com/calendar/u/1/r';

const manifestData = encodeURIComponent(JSON.stringify({
    "short_name": "Calendar",
    "name": "Google Calendar",
    "icons": [
        {
            "src": "https://www.gstatic.com/calendar/images/manifest/logo_2020q4_192.png",
            "type": "image/png",
            "sizes": "192x192"
        },
        {
            "src": "https://www.gstatic.com/calendar/images/manifest/logo_2020q4_512.png",
            "type": "image/png",
            "sizes": "512x512"
        },
        {
            "src": "https://www.gstatic.com/calendar/images/manifest/logo_32.png",
            "type": "image/png",
            "sizes": "32x32"
        }
    ],
    "start_url": `${startUrl}`,
    "background_color": "#FFFFFF",
    "theme_color": "#F1F3F4"
}));

document.head
  .querySelector(':first-child')
  .insertAdjacentHTML(
    'beforebegin',
    `<link rel="manifest" href='data:application/manifest+json,${manifestData}' />`,
  );
console.log('inserted!');