How to use sandbox attribute of value ( no value ) with < iframe > tag in HTML ? with example

How to use sandbox attribute of value ( no value ) with < iframe >  tag in HTML ? with example 


When we add "no value " then  Applies all restrictions


Example 

<body>

<iframe src="https://tech.thinkforu.org"

 sandbox="no value ">

</iframe>

</body>

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