HTML5 contextmenu attribute question? [duplicate]

Question

can someone explain what the the contextmenu attribute does and if it can be used with all the HTML elements and can someone point me to some online demos/examples?

Answer 1

The contextmenu attribute refers to the <menu> element the user agent should render when a context menu is requested by the user (e.g. using the right mouse button or the Menu/Hyper key on modern keyboards.

You can find an example here.

Answer 2

You can see how it may look like in this demo: https://bug617528.bugzilla.mozilla.org/attachment.cgi?id=554309

At the time of writing only FireFox 8 supports it.