If you're like the 2016 version of Ian Forrest, then you think you have a decent handle on web accessibility. You put alt attributes on all your images (though you don't give much thought to the actual text) and you make sure your sites can be used with a keyboard (except for overlays, sometimes). Then, the day comes when you're given a 100-page accessibility audit from a client and a deadline for all issues to be fixed. "What is high contrast mode," you ask yourself, "...and why does it matter if these links are implemented in a list?" In this presentation, Ian will share some of the hard lessons learned over the past few years, from both a development and a project management perspective. Topics discussed will include an overview of common accessibility problems, tools used to validate accessibility issues, and best practices for training your team.