Make app canvas transparent in powerpoint (currently white canvas with no transparency control)
Using content app for powerpoint template, I would like host some UI (like charts) in the app canvas. However, when a powerpoint content app is rendered on a slide, it get a white canvas and it sits over the slide content. As a result, there is no way for the app developer to overlay the canvas on the slide content in a seamless way.
Ask: Make the app canvas transparent so that the app developer can decide the canvas background. This way the chart drawn will feel part of the slide and not out of place.
Another ask: Make the app canvas similar to a powerpoint shape so that we can take advantage of other features like hide/unhide canvas on click during slideshow

Karthik, thanks for your feedback! Unfortunately, this is not supported in the web browser. We understand the need and are looking for ways to solve this in the future.
Thanks,
Office Extensibility Team