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What is an iFrame
Why you would use a Responsive iFrame
Example of a Responsive iFrame
How to Insert A Responsive iFrame
How Determine the Aspect Ratio
Insert DIV wrapper prefix
How to update iFrame on the page

Example of a Responsive iFrame

Home
Managing Page Content
Inserting iFrames
Example of a Responsive iFrame

Please see the Youtube iFrame on this page: https://www.interactivepartners.com.au/WebEd-Editing-Basics which can stay in proportion even you try to resize the window.