HTML Tidy

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HTML Tidy is a computer program and a library whose purpose is to fix invalid HTML and give the source code a reasonable layout (aka indent style).

It was developed by Dave Raggett of W3C, then passed on to become a Sourceforge project. Its source code is written in ANSI C for maximum portability and precompiled binaries are available for a variety of platforms. It is available under the W3C license (a permissive, BSD-style license).

Examples of bad code it is able to fix:

  • Missing or mismatched end tags, mixed up tags
  • Adding missing items (some tags, quotes, ...)
  • Reporting proprietary HTML extensions
  • Change layout owing to predefined style
  • Transform characters from some encodings into HTML entities
  • Cleaning up presentational markup

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