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I have created a custom module and trying to show the iframe in admin area.

Created a new action and able to access the url in browser.

Layout look like

app/code/VENDOR/MODULE/view/adminhtml/layout/VENDOR_MODULE_registration_index.xml

Template look like

app/code/VENDOR/MODULE/view/adminhtml/templates/test.phtml (it contain the iframe as <iframe src="https://www.google.com"></iframe>)

I have tried 

<body>
    <referenceContainer name="content">
        <block class="Magento\Framework\View\Element\Template" name="One" template="VENDOR_MODULE::test.phtml" />
    </referenceContainer>
</body>

OR

<body>
    <container name="root" label="Root">
        <block class="Magento\Framework\View\Element\Template" name="One" template="VENDOR_MODULE::test.phtml" />
    </container>
</body>

But the custom phtml file does not render on the browser?

How to set custom HTML content/iFrame in the admin area?

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I have debug it more and found that the layout file name is wrong. The correct file should be

FRONTNAME_registration_index.xml

frontName is defined in routes.xml.

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