What this page shows
- Event listeners for click, keyboard, input, and submit events.
- Interactive components: a theme toggle, a counter game, and a collapsible FAQ.
- Custom JavaScript form validation (native validation disabled) with helpful inline feedback.
Counter game
Use the buttons or your keyboard: ↑ to increment, ↓ to decrement, R to reset.
FAQ (collapsible)
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An event listener runs a function in response to a user action (click, keydown, input) or system event.
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It improves user experience and performance by updating only what’s needed on the page.
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In
script.js, which attaches handlers to inputs and the form. HTML5 validation is disabled vianovalidate.
Sign-up form (custom validation)
All validation is done with JavaScript. Try typing! Errors appear inline as you go.