PWA = Progressive Web Apps HTMLにコード＋manifest＋servise-worker.jsの３種類用意する html manifestとscriptを加える <link rel="manifest" href="./manifest.json"> <script src="./servise-worker.js?ver=3"></script> <script> if ('serviceWorker' in navigator) { navigator.serviceWorker.register('./servise-worker.js') .then((r…</link>