Course Presentation Reading Order

Is it possible to verify the reading order of course presentation slides for assistive technology? Similar to Reading Order/Selection Pane in PowerPoint? I believe the reading order is determined by order added to the slide, but worry minor edits could disrupt the reading order of a slide when it has multiple elements. Perhaps an overly number on each slide element indicate its reading order?

Summary: 
Reading order of course presentation
Content types: 
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