Copying my comment from below. Disclaimer: I work for John Shewchuck / Microsoft.
W3C is working on Web App Manifests (http://www.w3.org/TR/appmanifest/), allowing websites to declare app-like properties. ManifoldJS uses that standard for those platforms that support it, but falls back to Cordova for those who don't. Cordova is awesome, but the W3C also considers work done at Mozilla (Firefox Open Web Apps), Google (Chrome Hosted Apps) and stuff we did (Windows 8 had local web apps, Windows 10 extends over to hosted web apps).
Please revive the Web SQL Database HTML5 API defacto standard [1] or create a new proposal for a relational database API.
The NoSQL Indexed Database API is okay, but as we all have learned NoSQL isn't the right solution for everything - both SQL and NoSQL have their place - right? So please add SQL to HTML5 - especially for offline web apps.
[1] Supported on more than 90% of all mobile devices (Android, iOS). http://www.w3.org/TR/webdatabase/ (specification is no longer in active maintenance)
W3C is working on Web App Manifests (http://www.w3.org/TR/appmanifest/), allowing websites to declare app-like properties. ManifoldJS uses that standard for those platforms that support it, but falls back to Cordova for those who don't. Cordova is awesome, but the W3C also considers work done at Mozilla (Firefox Open Web Apps), Google (Chrome Hosted Apps) and stuff we did (Windows 8 had local web apps, Windows 10 extends over to hosted web apps).