One problem with my script is that I used/referenced Ken True's renamed Leaflet CSS and JS files from his 'wxquake' script, like this:<link rel="stylesheet" href="quake-json.css"/>
<script type="text/javascript" src="quake-json.js"></script>
</head>
The map obviously won't display without these resources. I've attached them here in a zip in case you need them.
An alternative would be to use a hosted version of Leaflet:<link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.3/dist/leaflet.css" />
<script src="https://unpkg.com/leaflet@1.3.3/dist/leaflet.js" type="text/javascript"></script>
</head>
but the zoom in and out boxes aren't very attractive this way.
I have also added the 'quake-json.zip' to the 'wxwpcmedr.zip' on my scripts page.