Use JavaScript for enhancement while keeping core content and navigation reliable
Goal
You should be able to demonstrate the result described in the lesson and explain why each step was necessary.
You should be able to demonstrate the result described in the lesson and explain why each step was necessary.
Step-by-step
01
Start with working HTML
The page should still contain meaningful content before JavaScript runs.
02
Target stable selectors
Use data attributes or clear classes rather than fragile DOM assumptions.
03
Handle errors
Network requests and browser APIs fail. Show useful fallback states.
04
Avoid huge dependencies
Do not add a framework to implement a tiny interaction that a few lines of browser JavaScript can handle.
05
Respect reduced motion
Animations should honor user preferences and should not block interaction.
Verify before moving on
You should be able to demonstrate the result described in the lesson and explain why each step was necessary.
You should be able to demonstrate the result described in the lesson and explain why each step was necessary.
Troubleshooting
If a command or screen differs from the lesson, stop and verify the version you are using before forcing a change.
What you learned
You now understand the purpose of this part of the system and have a concrete result you can verify before continuing to the next lesson.