RELAX NG Schema for HTML 5: Web Application Features # Additions to Common Attributes Context Menu: contextmenu Editable Content: contenteditable true false Draggable Element: draggable true false Hidden Element: hidden hidden Spellchecking and grammar checking: spellcheck true false Application Cache: manifest Progess Indicator: <progress> Command with an associated action: <command type='command'> command Selection of one item from a list of items: <command type='radio'> radio checked State or option that can be toggled: <command type='checkbox'> checkbox checked disabled Menu: <menu> toolbar context Menu Item: <li> Canvas for Dynamic Graphics: <canvas> Additional On-Demand Information: <details> open Caption/summary for details element: <summary>