A correct embed code should always starts with <iframe and ends with </iframe>. In some cases when you copy embed code from any source, they add their branding with that code which will appear with your content on course delivery. You can very easily remove that part from copied embed code.


For example, when I copied embed code from Vimeo, that's what I received:


<iframe src="https://player.vimeo.com/video/296101859" width="640" height="360" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> <p><a href="https://vimeo.com/296101859">How to Talk to Your Kids About Race</a> from <a href="https://vimeo.com/atlanticvideo">The Atlantic</a> on <a href="https://vimeo.com">Vimeo</a>.</p>


In this embed code (shown above) , I have underlined the unnecessary code, that was given after the </iframe>. Once any such code is removed, you are good to go. Some samples provided below show how the good part of the code is always written within the words 'iframe' like this-  <iframe Good part of the code </iframe>.


Sample YouTube Embed Code

<iframe width="560" height="315" src="https://www.youtube.com/embed/FPaUU0il_S4" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>


Sample Vimeo Embed Code
<iframe src="https://player.vimeo.com/video/296101859" width="640" height="360" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>


Sample Prezi Embed Code
<iframe id="iframe_container" frameborder="0" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen="" allow="autoplay; fullscreen" width="550" height="400" src="https://prezi.com/embed/3jk4domsau3i/?bgcolor=ffffff&lock_to_path=0&autoplay=0&autohide_ctrls=0&landing_data=bHVZZmNaNDBIWnNjdEVENDRhZDFNZGNIUE1JcWJJKzYzVWlod2RnejJKM1RxVnN4YmlrVHFRMnBSRTN4UGlYZHV2az0&landing_sign=y8Pwu6gL71kFjafeL5v-oMQBIl2avLfo6Qb7GLiMlS4"></iframe>