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

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

    subgraph cluster_ax_tree {
        label = "Accessibility Tree";
		
        a [label="Document"];
        a -> b;
        b [label="Heading"];
	b -> c;
	c [label="StaticText 'Sign In'"];
	a -> d;
	d [label="TextBox 'Username'"];
	a -> e;
	e [label="Button 'Submit'"];
    }

    subgraph cluster_ui_tree {
        label = "DOM Tree";

        A [label="<body>"];
        A -> B;
        B [label="<h1>"];
	B -> C;
        C [label="Sign In"];
	A -> D;
        D [label="<input type='text'\nplaceholder='Username'>"];
	A -> E;
        E [label="<input type='submit'>"];
	
    }
}