Update iframe source dynamically in the Masterpage

I have an iframe in Masterpage updatepanel . It has an .html page as its source. So, there is a textarea where the html page is displayed .  When i modify the html page in the textarea and click on a button , it should update the html content back to html page. [Basically i want the updated dom of the iframe to be assigned back to the innertext of the html body of the html page . i am currently using htmlagility pack to achieve read and save of the .html page. The only thing not working is the updating of .html file dynamically .

Is it possible to do so ?
Vrik22Asked:
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David Johnson, CDRetiredCommented:
You have no control over the contents of an iFrame from your website. It is treated as an entirely different item. So don't use an iFrame if the html page is on your website. use import instead
<link href="extern.html" rel="import" />
https://www.jotform.com/blog/html5-imports-import-html-files-into-html-files-83467/

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