The native <details> element provides built-in expand/collapse behavior without additional scripting. Enhance the experience by styling <summary> and adding subtle transitions so that content appears smoothly.
Works with keyboard and screen reader users by default.
Supports deep linking when paired with URL fragments.
Great for FAQs and definition lists.
Example 2: Custom Toggle Button
Onboarding Checklist
Confirm account email and set up multi-factor authentication.
Review team guidelines and shared resources.
Schedule kickoff meeting with the project owner.
Complete the first milestone tasks and report findings.