From version 2.0.13 and up its possible to print the contents of a webpage via the native Android Print client (previously referred to as Cloud Print), it requires a device running Android 4.4 or higher and a device configured for printing via Android Settings > Connected Devices > Printing.

Printing can either be invoked from the print menu item or more likely via the JavaScript function.

If you are looking to print via bluetooth please see this article.

To enable the menu item go to Settings > Toolbar > Show print Menu Item.

JavaScript Functions
You may use the KBBluetooth namespace when communicating with a bluetooth device, note you can communicate with more than just printers using SPP (serial port profile) over bluetooth. A JavaScript sample written for ESC/POS compatible printers can be found here.

Extensive documentation can be found in the JavaScript Interface help area.
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