Fullscreen in a the context menu

example.html

<canvas contextmenu="fullscreenmenu"></canvas>
<!-- can be a div if you prefer -->

<menu id="fullscreenmenu" type="context">
  <menuitem label="fullscreen"
            onclick="document.querySelector('canvas').requestFullScreen()">
  </menuitem>
</menu>

<script>
  HTMLElement.prototype.requestFullScreen = 
    HTMLElement.prototype.requestFullScreen ||
    HTMLElement.prototype.webkitRequestFullScreen ||
    HTMLElement.prototype.mozRequestFullScreen ||
    HTMLElement.prototype.oRequestFullScreen ||
    HTMLElement.prototype.msRequestFullScreen;
</script>

Thanks for this. However it looks like 'menuitem' has been deprecated in favour of 'command' instead: http://dev.w3.org/html5/spec-author-view/the-command-element.html

From http://caniuse.com/menu - "Partial support in Firefox refers to using the non-standard "menuitem" child elements, where the current spec uses "command" child elements. It is also currently limited to context menus, not toolbar menus."