Semantic HTML
Best practices for Accessibility
Semantic HTML is necessary as certain elements have different properties which will help you [as well as other users].
ARIA
Not the Meloetta you're looking for.
Accessible Rich Internet Applications [ARIA] is a set of attributes that you can add to elements to provide more context to assistive technologies.
ARIA Live Regions
Change content - one calamity at a time.
ARIA live regions are parts of a webpage which announce to its users if the content dynamically changes.
A Tour of Computer Systems
Computer Systems : A Programmer's Perspective
Information is Bits