Go to your Modern SharePoint site.
Click 'Edit' on the page.
Click the '+' sign to add a web part.
Choose 'Embed'.
1<div class="video-container">
2 <iframe
3 id="tetrons-iframe"
4 src="https://product.tetrons.com/embed"
5 style="width:100%; height:100vh; border:none;"
6 allow="clipboard-read; clipboard-write; microphone; camera"
7 ></iframe>
8</div>Modern SharePoint blocks some scripts and inline JS.
You cannot use <script> tags in Modern SharePoint Embed web parts, so Materialize JS won't work unless in a Classic page or custom SPFx solution.
Only CSS and HTML are reliably supported in the Embed web part.
If your SharePoint is on HTTPS, ensure the Tetron URL also uses HTTPS to avoid mixed content issues.
1<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>