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14" notebook with mate display, works great. Local dev web server. Good IDE with good language support. Keep as much as possible offline.

A problem is the unreliable 3G/4G connection and the onboard WiFi isn't that reliable as well.

http://devdocs.io has a offline mode using modern browser features.

If you have a Mac, there is the very good soft "Dash" to work offline: https://kapeli.com/dash