In Administration > Security > Site security settings, check enabletrusttext (Enable trusted content) In a new course, add a new Wiki W1 activity. Add a new page in the Wiki W1 In the editor, got to source code  (View/Source code) and paste the following:   <!-- Using the iframe tag to embed a YouTube video --> <iframe width="1280" height="720" src="https://www.youtube.com/embed/7N0rv9bEewY" title="How can new users access my Moodle site?" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe> <!-- Using the embed tag to display a PDF file --> <embed src="https://moodle.univ-tln.fr/pluginfile.php/113668/mod_resource/content/5/01_Moodle-premier-pas.pdf" type="application/pdf" width="600" height="400"> <!-- Using the figure tag to display an image with a caption --> <figure>     <img src="https://docs.moodle.org/402/en/images_en/1/17/Boost40.png" alt="Sample Image">     <figcaption>This is a caption for the sample image.</figcaption> </figure> View the page You should see at least the image and the iframe Go back in editing mode and view source Ensure that the 3 elements (iframe, embed and figure) are still there