Rocket Validator automatically checks your pages on the W3C Validator.
HTML issues tagged as file.
required attribute can only be used with certain types of inputs. Check the input type is one of the allowed.
required attribute, if present, indicates that the user must specify a value for the input before the owning form can be submitted.
25,000 HTML checks per month. Is that enough for your site?
Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.