markup-validator
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w3c
The page https://www.motionmountain.net/ cannot be checked in Validator ("403 forbidden"), but without problems in nuHTML. What is the reason? P.S. It is validated in Validator when clicking on "Validate error...
Just got a mod security action 403: ```logs User-Agent: W3C_Validator/1.3 libwww-perl/6.68 --23480000-F-- HTTP/1.1 500 Internal Server Error --23480000-H-- Message: Access denied with code 403 (phase 2). Matched phrase "libwww-perl" at...
The HTML Spec allows those new attributes, but they cause errors while validating markup. 1. Attributes _popovertarget_ and _popovertargetaction_ should be [allowed on button-elements](https://html.spec.whatwg.org/multipage/popover.html#the-popover-target-attributes). 2. Attribute _popover_ should be [allowed...
Greetings! We would like to allow W3C Validator to access our website. But it is currently blocked by our WAF. The easiest approach would be to allow the source-networks. But...
When we check our website with the HTML checker, we get the following error: ``` Error: Bad value graphics-symbol img for attribute role on element svg. From line 1, column...
Entering Google domain (e.x. google.com) into the validator text field and clicking "Check" opens the Google website instead of the validation summary.
When trying to validate an URL which returns an HTTP error (e.g. 404), the validator will give an error ("Sorry! This document cannot be checked."). On that error page, it...
