If the diagram of yours runs in a browser, try looking at the browser console via the right-click + Inspect option (or equivalent). That might help you identify the problem.
If you are using his Interactive Diagrams for your diagram, the following could be helpful. If not, disregard it.
On top of providing the HTML definition you also need to point to the JS script in an HTML script element pointing to it, like so:
You also have the option of copying the script to a local file for testing without Internet access.
Also, make sure you're copying the whole section when you copy the sourcecode. Missing even a single character can throw things off. For reference, the Diagram starts at <div class="idiagram"> and then ends at its corresponding </div> tag.
If the diagram of yours runs in a browser, try looking at the browser console via the right-click + Inspect option (or equivalent). That might help you identify the problem.
If you are using his Interactive Diagrams for your diagram, the following could be helpful. If not, disregard it.
On top of providing the HTML definition you also need to point to the JS script in an HTML script element pointing to it, like so:
<script src="https://www.chessvariants.com/membergraphics/MSinteractive-diagrams/betzaNew.js?nocache=true">
You also have the option of copying the script to a local file for testing without Internet access.
Also, make sure you're copying the whole section when you copy the sourcecode. Missing even a single character can throw things off. For reference, the Diagram starts at <div class="idiagram"> and then ends at its corresponding </div> tag.