The result: A lot of if statements! And you have to type them all! Now imagine that the number of validations increases from 10 to 25 because 15 new use cases must be implemented in the next iteration ...

A recent tweet from Google’s Gary Illyes called attention to problem of invalid HTML. Google is fine with invalid HTML. Less well known is that there are negative outcomes associated with invalid HTML ...

While a well-formed document is well-formed because it follows rules defined by the XML spec, a valid document is valid because it matches its document type definition (DTD). The DTD is the grammar ...