How to insert a Youtube video in WHMCS knowledgebase article

To insert a YouTube video in an article of the WHMCS knowledge base, you need to insert following HTML code:

<iframe src="https://www.youtube.com/embed/Y1_1NQWQJ2Q" width="420" height="315"></iframe>

The result, as follows:

If you need to debug Smarty code in a production environment, whithout the issue that debug popup...

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