Example of vertical axis in a track
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<head>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://tntvis.github.io/tnt.board/build/tnt.board.min.js"></script>
<script src="track_y_axis.js"></script>
<link rel="stylesheet" type="text/css" href="https://tntvis.github.io/tnt.board/build/tnt.board.css"/>
</head>
<body>
<div id="mydiv"></div>
<script>
var myBoard = tnt.board().from(20).to(500);
var theme = pins_theme();
theme(myBoard, document.getElementById("mydiv"));
</script>
</body>
Modified http://d3js.org/d3.v3.min.js to a secure url
https://d3js.org/d3.v3.min.js
https://tntvis.github.io/tnt.board/build/tnt.board.min.js