Console in the editor (beta)
Clear console on run
Indent with tabs
Code hinting (autocomplete) (beta)
Only auto-run code that validates
Auto-save code (bumps the version)
Auto-close HTML tags
Live code validation
Highlight matching tags
Show boilerplates bar less often
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No autoresizing to fit the code
Render blocking of the parent page
An example of how you can implement your own error messages using the constraint validation API.
/echo simulates Async calls:
See docs for more info.
Created and maintained by Piotr and Oskar.
Hosted on DigitalOcean
All code belongs to the poster and no license is enforced. JSFiddle or its authors are not responsible or liable for any loss or damage of any kind during the usage of provided code.
Roadmap (vote for features)