You've probably encountered this scenario: you land on a form with a single text box. No label, just a placeholder that says "Search..." which disappears the moment you click. Or maybe you've seen a password field that rejected your entry, only to discover afterward that it required at least 12 characters, one uppercase letter, one number, and a special symbol - requirements that were mentioned nowhere near the field itself.
These frustrating experiences aren't just bad design - they're accessibility barriers. And they affect everyone, not just people using assistive technology.