INSTRUCTIONAL DESIGN RESPONSE: Storyline 2 has several built-in features to help our courses meet disability requirements. We also add the audio narration to each course within in a dropdown, so that anyone who is Deaf or hard of hearing can read the narration.
Side note: We used to always add a popup message at the beginning so that people who are Deaf or hard of hearing know where to locate that, but for some reason we've moved away from that. I think it stopped happening when we moved into Storyline; was a detail we used to always add into courses in SmartBuilder and was lost in the transition to Storyline. We can always add it into specific courses if need be, and I will make a note to start re-adding that into courses moving forward.
Here is a good list from the Articulate website to show what features are built into the software: https://www.articulate.com/products/storyline-section-508.php
Going through these lists we compensate for nearly everything. We follow the best standards for HTML development, which in turn takes care of most accessibility requirements. We always provide alt tags for images and add descriptive tags as part of creating clean code. There's a checklist on the Tech Republic site that we follow pretty closely, so for more details you can take a look there. More recently we've also been implementing aria tags, which although aren't required for the ADA compliance, they are newer HTML tags that will make the site even further accessible, which I can say most sites don't implement.