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Test, Launch, and Maintain Your App

Lesson 3: Design and Accessibility Pass

Lesson Objectives

By the end of this lesson, students should be able to:

  • Apply consistent design across screens.
  • Check accessibility basics.
  • Write helpful error and empty-state messages.

Lesson Content

Design pass: consistent colors and fonts, one clear main button per screen, readable spacing on phones.

Accessibility basics:

  • Text contrast strong enough to read.
  • Text size readable on phones.
  • Every form field has a visible label.
  • Images have descriptions (alt text) where they matter.
  • The app works with a keyboard (Tab key moves through fields).
  • Error messages say what went wrong and how to fix it ("Enter a phone number with 10 digits").

Empty states: "No orders yet. Orders will appear here when customers place them."

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