User:Guarapiranga/accessKeysCheatSheet.js

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This user script seems to have a documentation page at User:Guarapiranga/accessKeysCheatSheet.

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$('body').keydown(function(e) {
	if (!(e.altKey && e.shiftKey && e.key == '?')) return;
	if (!$('#akcs').length) {
		$('#bodyContent').after(
			$('<div>').attr('id', 'akcs').css('display', 'none').html(
				// Here goes your content (in HTML).
			)
		);
	}
	$('#bodyContent, #akcs').toggle();
});