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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