A fork of @lennyjpg's tributary inlet only lightly adapted for s.trokes.org.
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<meta charset="utf-8">
<title>hi</title>
<style>
button {
position: absolute;
background: transparent;
margin: 10px 384px;
width: 180px;
font-size: 18px;
padding: 6px;
top: 450px;
border: thin dashed #440000;
}
</style>
<button type="button">!</button>
<body>
<svg height="500" width="960"></svg>
<script type="text/javascript" src="https://d3js.org/d3.v3.min.js"></script>
<script type="text/javascript" src="hi.js"></script>
</body>
Modified http://d3js.org/d3.v3.min.js to a secure url
https://d3js.org/d3.v3.min.js