Overlay item for all slides in PowerPoint
I want to make a PowerPoint add-in to show some small html+css component on each slide, and not by adding add-in every time I'm adding a new slide. What should I look for and could it be done with some office add-ins and commands APIs? In PowerPoint, the way to add content that's repeated on every slide is called Slide Master (View > Slide Master). Unfortunately, content add-ins in the Slide Master view show only the static image of the add-in, not live HTML+CSS. So there's no way to put live HTML+CSS on every slide with a single operation, but if all the user needs is the image of the content