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chromium/docs/accessibility/browser/figures/hidden_content.gv 

digraph graphname {
    graph [fontname = "helvetica", fontsize=11];
    node [shape="box", fontname = "helvetica", fontsize=11];

    subgraph cluster_ax_tree {
        label = "Accessibility Tree";
		
        document [label="Document"];
        document -> button;
        button [label="Button 'Show Sidebar'"];
	document -> main;
	main [label="Main"];
	main -> heading;
	heading [label="Heading"];
	main -> main_rest;
	main_rest [label="..."];
    }

    subgraph cluster_ui_tree {
        label = "DOM Tree";

        Body [label="<body>"];
        Body -> Sidebar;
        Sidebar [label="<div id='sidebar'\naria-hidden='true'>"];
	Sidebar -> SidebarContents;
        SidebarContents [label="..."];
	Body -> Button;
	Button [label="<button>"];
	Button -> ButtonContents;
	ButtonContents [label="Show Sidebar"];
	Body -> Main;
	Main [label="<main>"];
	Main -> H1;
	H1 [label="<h1>"];
	H1 -> H1Contents;
	H1Contents [label="..."];
	Main -> MainRest;
	MainRest [label="..."];
    }
}