Once i paste iframe code in in knowledge article after publishing not showing on portal

[manisa]

Hi,

I pasted this iframe code into the HTML of a knowledge base article.

<iframe style="width: 100vw; height: 100vh;" allowFullscreen src="Google Chrome Web Browser"></iframe>

Before updating the article, the embedded content displays in the article.

I need help on this, it will be useful.

After I update the article and go to the published page, the page displays an empty box. 

When I open the HTML page, I see the iframe code, but the URL has been removed.

Thanks!