JavaScript in VS Code

Class Toggling

Learn to change interface state through CSS classes and keep styling in CSS in this beginner-friendly Visual Studio Code lesson.

Learning outcomes

Explain how to change interface state through CSS classes.
Complete the guided activity safely.
Check that you can keep styling in CSS.

Before you begin

Use a non-sensitive practice folder, inspect unfamiliar code before trusting it, and never place passwords, tokens or private information in project files.

Open official guidance ↗

Step-by-step instructions

Open the intended practice workspace in Visual Studio Code and confirm its folder name and Workspace Trust state.
Build a simple disclosure control.
Save the relevant files and review the Problems panel, terminal, Source Control view or browser preview as appropriate.
Check filenames, relative paths, console messages, keyboard use, mobile layout and privacy before continuing.
Confirm that you can keep styling in CSS, then create a clear commit, backup or saved checkpoint.

Ian's practical tip: Work in one named project folder, preview after small changes, read the actual error message and keep a recoverable version before broad edits.

Practical activity

Build a simple disclosure control. The expected result is to keep styling in CSS.

Completion checklist

I used the intended safe practice workspace. I completed, saved and reviewed the activity. I checked errors, paths, browser behaviour and the saved result.