options for implementing a PowerPoint viewer on HTML for a web app (other than embedding with provided i-frame tag)

Question

Here's what I'm trying to accomplish: displaying a PowerPoint presentation on HTML. The user should be able to start and execute the presentation exactly like when you press the "Start Presentation" button in Microsoft PowerPoint: it goes fullscreen, transitions and animations are played, it goes to the next slide if a duration for the slide is set, on click it goes to the next slide, arrow keys are used for navigating slides and so on. Only need to run the presentation, NOT editing.

I've been looking around and came up with these three approaches:

1. Creating the viewer from scratch and processing/reading the.pptx file using HTML, CSS and JS, btw is this is feasible? I know it won't be easy, but it seems it would take a lot of time to develop (I'm just one person working in the project). Also free or paid approaches both are fine, the more options I get to know the better.
2. WOPI host, the problem with this is I need a paid Office365 membership.
3. Embedding using a third party such as Office Online, Google Docs, slides.com, the problem I noticed is that the i-frame they provide lacks from functionality and customization.

So my question is, are there other approaches for this? or is this all there is?

Final Edit : I decided to go with iSpring Converter Pro . Seems like the best option overall

Answer 1

1. Insane amount of work -> not worth it. But you could use a paid library such as Aspose.Slides
2. MS WOPI is, indeed, a way to do that. WOPI clients such as Office Online and Office Online Server offer an action called present . That's what you're looking for.
3. What about SlideShare's API and oEmbed ?

Another approach:

4. Convert the PPTX to ODF and use https://viewerjs.org/