ref="https://rdrr.io/pkg/charpente/man/build_js.html">build_js()</a></code> and deploy the app to shinyapps.io (remember, we must serve the app under HTTPS). Figure <a href="mobile-pwa.html#fig:mobile-pwa-installable">24.9</a>
illustrates the install prompt window that appears to install the app. Once installed, the <strong>beforeinstallprompt</strong>
event does not fire anymore and the app may be launched as a standalone app, for instance on macOSX (Figure <a href="mobile-pwa.html#fig:mobile-pwa-installed