offline HTML 5 validation

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I’m liking Henri Sivonen’s service. I’ve got it running locally, and it works well. I can use it as a web service and validate HTML from within Vim, using quickfix to rapidly resolve errors. My Jenkins CI server uses the same validator via phpunit tests.

Warning: it took me a very long time to get it running locally. Technically easy (just run a build script), but it downloads tons of libraries and files before it can do its job.

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