by extending the security perimeter outside the data-center and protect from increasing frequency, scale and sophistication of web attacks. Home screen icon and launch screen <link rel="manifest" href="/manifest.json"> { "short_name": “Polymer", "name": “Polymer Starter Kit", "icons": [ { "src": "launcher-icon-1x.png", "type": "image/png", "sizes": "48x48" }, {"src": "launcher-icon-2x.png", "type": "image/png", "sizes": "96x96" } ], "start_url": "index.html?launcher=true" "background_color": “blue" }