function queryCommandSupported(command) {
			command = command.toLowerCase();

			if (commands.exec[command]) {
				return true;
			}

			// Browser commands
			try {
				return editor.getDoc().queryCommandSupported(command);
			} catch (ex) {
				// Fails sometimes see bug: 1896577
			}

			return false;
		}
Returns true/false if the command is supported or not.

@method queryCommandSupported
@param {String} command Command that we check support for.
@return {Boolean} true/false if the command is supported or not.