HTML Checking for Large Sites

Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.

Attribute “required” is only allowed when the input type is “checkbox”, “date”, “datetime-local”, “email”, “file”, “month”, “number”, “password”, “radio”, “search”, “tel”, “text”, “time”, “url”, or “week”.

The boolean required attribute can only be used with certain types of inputs. Check the input type is one of the allowed.

The required attribute, if present, indicates that the user must specify a value for the input before the owning form can be submitted.

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Related W3C validator issues