iframe advanced to preview html files code example
Example: how to open a website inside a website
<iframe src="https://www.codegrepper.com" width="100%" height="300px"
title="website" style="border: 10px solid black;">
</iframe>
<iframe src="https://www.codegrepper.com" width="100%" height="300px"
title="website" style="border: 10px solid black;">
</iframe>