HTML 5 Parsing. Firefox nightlies include a new parser that implements the HTML5 parsing algorithm (disabled by default), which uses C++ code automatically generated from Henri Sivonen’s Java parser first used in the HTML5 validator. # 11th July 2009, 11:36 pm
The Resource Expert Droid. Like the HTML Validator but for your server’s HTTP headers—extremely useful. # 25th June 2009, 10:06 am
If you write a spec, write a validator alongside. How much pain could have been spared with early versions of RSS if we’d had a common, agreed upon validator. In short, it’s the test suite that ultimately decides the spec.
— Joe Heck # 30th May 2007, 1:48 am