The simple starter plotly.js not rendering a graph--do you see anything that is not as it should be?

plotly.js
1

Your advice appreciated (tried with the script code where it is & also within the head):

2

Code did not make it with the post. Trying again:

<html>
<head>
<script src="https://cdn.plot.ly/plotly-latest.min.js"></script>
</head>
<body>
<div id="tester" style="width:600px;height:250px;"></div>

<script>
    TESTER = document.getElementById('tester');
    Plotly.plot(TESTER, [{
    x: [1, 2, 3, 4, 5],
    y: [1, 2, 4, 8, 16] }], {
    margin: { t: 0 } } );
</script>
</body>
</html>
3

Everything looks fine to me.

Can you try opening the browser console and see if there are any errors being logged?