Hi,
To get Solution 1 working you need to include the file csi.js, which you can locate
here[
^].
As per the example shown on GitHub, to use this library you must include the file csi.js in your page header, then you need to add the data-include attribute with its value set to the file you want to include, on the container element.
<html>
<head>
<script src="csi.js"></script>
</head>
<body>
<div data-include="Test.htm"></div>
</body>
</html>
... hope it helps.