Check out example codes for "html iframe tag". It will help you in understanding the concepts better.

Code Example 1

<iframe src="http://kidcreatorsteam.com" height="90px" width="40px"></iframe>
<!--I made an iframe! Yay! -->

Code Example 2

<iframe src="demo_iframe.htm" height="200" width="300"></iframe>

Code Example 3

<iframe src="http://www.codegrepper.com"></iframe>

Code Example 4

<iframe src="https://www.w3schools.com"></iframe>

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