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Frameworks & web · #codepen
Compare CodePen's iframe embed, the Prefill API, and self-hosted snippets for docs sites, with a working hybrid implementation and validation steps.
Enable SCSS in CodePen via Pen Settings → CSS → Preprocessor, then verify the compiled CSS in DevTools. Includes a worked example with variables and nesting, plus pitfalls like silent @import failures and unsupported @use syntax.
Steps to identify why CodePen's live preview stops reflecting changes and how to restore it.
Learn how to upload and reference images, fonts, and JSON files using CodePen's Pro Asset Hosting feature, including cache-busting techniques and storage limits.
CodePen's Asset Hosting gives Pro users a CDN-backed, permanent home for prototype images and fonts—eliminating broken third-party links. Here's how it works, a concrete workflow, and the quotas that keep it a prototyping tool, not a production CDN.
Learn how to add images, fonts, JSON or other files to a Pen using CodePen’s built‑in asset host and reference them with relative URLs.
Choose CodePen Pens for single-file, embeddable prototypes and Projects for multi-file apps with npm. A compact comparison and validation steps help you avoid migrating work later.
Explore the architecture behind CodePen's real-time previews, from Web Worker-based compilation to sandboxed iframes and debouncing strategies.
Decide whether to upload libraries to CodePen’s asset storage or link a public CDN. Compare limits, reliability, and version control, then see a concrete implementation and validation steps.
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