Embed live website (live web/iframe) into PowerPoint presentation + universal compatibility

Task
It is necessary to embed a LIVE website into a PowerPoint presentation so that the page displays directly within the slide during the presentation (not a screenshot). The solution should work for the widest possible range of users and not require the recipient to manually install dependencies.

What I expect from the performer
— Option for Windows (PowerPoint 2016/2019/2021/365): embedding live web/iframe inside .pptx without requiring the recipient to install anything (Office Add-in or a similar approach).
— Fallback for MacOS/unsupported versions: a clickable smart object/button that opens the same page in the browser.
— A test sample for verification before the final version.
— A completed .pptx + a brief instruction (PDF/Doc) on how to change the URL to another one.
— A short video (screencast) demonstrating the functionality (how the page loads in the slide).
— Support for corrections for 7 days after submission.

Acceptance criteria
1) On Windows 10/11 + PowerPoint 2019/365, the page loads directly in the slide during the presentation, without the recipient having to install third-party programs (standard "Enable content" is allowed).
2) For Mac/unsupported versions, a neat fallback (button/object) is provided that opens the page in the browser.
3) The instruction is clear: where to change the link, what to do if the page does not load (check internet/security policy).

Please indicate in your response:
— What approach you will propose for Windows (briefly).
— What will be used as a fallback for Mac.
— Examples of similar works (if any) or a short sample/video.
— Deadline.


PowerPoint, Office Add-in, LiveWeb, WebView, iframe, Windows, MacOS, VBA