Simple HTML Radio

Demo

Appearance depends on your OS

Option 1

Option 1

Option 2

Place focus on textbox and hit Tab key.

Option 1 - Hit Spacebar to select

Option 2 - Hit Spacebar to select

Option 3 - Hit Spacebar to select

Put focus on one of the radio buttons and use Left, Right, Up and Down to navigate.

Option 1

Option 2

Option 3