How to build web app (code)

We have less than 20 seconds to impress your users because of that web app has to be simple and fast application. I will show you 7 items every web app should has:

- Loading additional pages of data

- Display big photo

- Display programmatically data from server

- Change text height

- Display static map

- Send email from app

- Linking to phones, e-mails, and maps

I didn't include code for server(php scripts and MySQL database) because I have already app on the market where you can find everything for server side.