Tag w3c-validation - This is page 1 - GeneraCodice

URL markup validation error

https://www.generacodice.com/en/articolo/13687798/url-markup-validation-error
  PHP  -  validation  -  wordpress  -  w3c-validation
StackOverflow StackOverflow

w3c validator shows error for facebook open graph

https://www.generacodice.com/en/articolo/13413385/w3c-validator-shows-error-for-facebook-open-graph
  wordpress  -  facebook  -  w3c-validation  -  facebook-opengraph
StackOverflow StackOverflow

My nav is undefined, even with my document type declared

https://www.generacodice.com/en/articolo/12934303/my-nav-is-undefined-even-with-my-document-type-declared
  html  -  css  -  w3c-validation
StackOverflow StackOverflow

there is no attribute "placeholder" and there is no attribute "autocomplete"

https://www.generacodice.com/en/articolo/12899560/there-is-no-attribute-placeholder-and-there-is-no-attribute-autocomplete
  html  -  doctype  -  w3c  -  w3c-validation
StackOverflow StackOverflow

"An img element must have an alt attribute, except under certain conditions." What conditions?

https://www.generacodice.com/en/articolo/12889390/an-img-element-must-have-an-alt-attribute-except-under-certain-conditions-what-conditions
  html  -  w3c-validation
StackOverflow StackOverflow

w3c css validator parse error

https://www.generacodice.com/en/articolo/12832186/w3c-css-validator-parse-error
  css  -  w3c-validation
StackOverflow StackOverflow

Why is my HTML id attribute invalid, when I have 4x the same id plus a counter? [closed]

https://www.generacodice.com/en/articolo/12806449/why-is-my-html-id-attribute-invalid-when-i-have-4x-the-same-id-plus-a-counter-closed
  html  -  JavaScript  -  radio-button  -  radiobuttonlist  -  w3c-validation
StackOverflow StackOverflow

Google fonts URL break HTML5 Validation on w3.org

https://www.generacodice.com/en/articolo/12748036/google-fonts-url-break-html5-validation-on-w3-org
  html  -  w3c-validation  -  google-font-api
StackOverflow StackOverflow

HTML5 Validation error with select required attribute

https://www.generacodice.com/en/articolo/12554215/html5-validation-error-with-select-required-attribute
  html-select  -  w3c-validation
StackOverflow StackOverflow

Is an HTML5 document a valid one if it doesn't have any of the standard HTML5 elements?

https://www.generacodice.com/en/articolo/12508914/is-an-html5-document-a-valid-one-if-it-doesn-t-have-any-of-the-standard-html5-elements
  html  -  w3c-validation
StackOverflow StackOverflow
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