As far as I know and the docs state, nothing fundamental has changed. The basic markup is
<input name="your_name" value="your_value" type="checkbox">
What is new is some interesting properties.
form– a reference to the form the control is associated with (nice!)autofocus– to be focused as soon as the document is loaded (nice!)required– require that it be checked (super nice! Although it isn’t supported by Internet Explorer or Safari (yet).)