CodePen

A small place to test an idea

CodePen provides an online coding and preview environment. Use it for a button animation, layout experiment or minimal bug reproduction.

Suggested first demo

Create a button, add styling and a click state, then check keyboard interaction in Preview. Save the Pen to share the idea.

Visibility and limits

At review time, Free included public Pens with three files per Pen. Privacy controls and asset hosting require paid plans. Do not include secrets in public work. Check licenses before reusing community code.

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Reviewed October 4, 2026 against official documentation. Examples are suggested workflows, not a completed hands-on test. Features and limits may change.

Sources: CodePen · 方案与隐私规则