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How to add iframe tag in CMS page in Magento 2.2
<iframe src="https://google.com" frameborder="0" width="500" height="900"></iframe>
On the CMS page in the admin, click the Show/Hide Editor button and paste the HTML there. The standard WYSIWYG will not render HTML.
First embed the required URL (embed.ly works). Then, copy paste into the CMS page Html render using WYSIWYG. Or, use the show/hide editor option and paste the HTML.
Required, but never shown