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CodePen

codepen.io

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codepen.io
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A playground to test HTML, CSS and JavaScript live.

Strengths

  • Instant live preview of HTML, CSS and JavaScript
  • Huge gallery of demos and animations to learn from
  • Easy to share or embed a snippet

Limitations

  • All pens are public on the free plan
  • Not suited to large projects
  • Asset uploads require a paid plan
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