How to use sandbox attribute value (allow-forms ) with < iframe > tag in HTML ? with example

How to use sandbox attribute of value (allow-forms ) with < iframe >  tag in HTML ? with example 


 Allows form submission and then 

The server has processed your 

input and returned answer 

what data is put on your form


Example


<body>

<iframe src="demo_formtech.html "

 sandbox="allow-forms">

</iframe>

</body>

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