Nu Html Checker

The W3C's online checker that tests HTML documents against current HTML conformance rules.

FreeProprietaryWeb

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About Nu Html Checker

Nu Html Checker is the W3C's web-based validator for modern HTML. You can check a page by entering its address, uploading a file or pasting markup. It then reports errors and warnings against the current HTML conformance rules.

Options can show the document source, a heading outline and an image report, or limit the output to errors and warnings. You can also check error pages and set the User-Agent and Accept-Language headers sent with the request. The W3C describes the tool as an ongoing experiment whose behavior may change.

Strengths

  • Checks against current HTML conformance rules rather than old doctypes
  • Accepts a URL, a file upload or pasted markup
  • Optional outline, image report and source views
  • Can send custom User-Agent and Accept-Language headers

Limitations

  • Checks one document at a time
  • Behavior is described as experimental and subject to change

Details

Pricing
FreeFree to use on the W3C website.
License
Proprietary
Developer
W3C
Platforms
Web
How it runs
Web application
Account
Not required
Works offline
No
Best suited for
Web developers checking that a page's HTML is valid
Last verified
Added
Provenance
Selected from the TechWalrus Resource Hub (Website Checkers & Audit Tools); facts checked against the developer's own pages, 2 sources on file.

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