w3c-validation Examples and Free Source Code

How to make a sitemap link in the page head pass the W3C validator?...

html sitemap w3c-validation html-head

W3C validation of Joomla page: "The type attribute is unnecessary for JavaScript resources.&quo...

javascript html joomla w3c-validation

Validation error: "The itemprop attribute was specified, but the element is not a property of a...

seo meta-tags w3c-validation schema.org microdata

document type does not allow element "div" here; assuming missing "object" start...

w3c-validation

Can self closing <link> tags be problematic?...

w3c w3c-validation

How to send files via post request in python similar to curl? (W3C validator)...

python curl post python-requests w3c-validation

W3C CSS Validator shows error on svg rule: "only 0 can be a unit"...

css validation svg w3c-validation

Can a table row have no cells?...

html html-table language-lawyer w3c-validation

CSS Validator error = Value Error : background 100% is not a color-stop value )...

css error-handling w3c-validation w3-css

W3C validator and HTTPS...

ssl https w3c-validation

Going to buy this theme. But w3 validator says it's invalid...

html wordpress-theming w3c-validation

w3 html5 validation, anchor not allowed as child of ul...

html w3c-validation

W3C Validation and Vue's HTML binding syntax...

html vue.js w3c-validation

Can I use label element with select?...

html label html-select w3c-validation

How to write W3C compliant multi-level bullet points in HTML?...

html w3c-validation html-lists

Why doesn't the W3C RDF validator replace the URI using the full namespace?...

rdf w3c-validation rdf-xml

Is there a better approach to html standards validation than w3c validator?...

html w3c-validation semantic-markup

Clearing a floated <li> correctly...

height css-float w3c-validation

HTML5 Validation error with select required attribute...

html-select w3c-validation

Linkedin share button is not valid according to W3c...

javascript html share linkedin-api w3c-validation

W3C don't validate Viewport...

html w3c w3c-validation

W3C validator error with Chatango embedded code...

javascript html embed w3c-validation

Clarification regarding validity of using data-URIs in CSS url()...

css standards w3c-validation data-uri

How widely supported is the iframe attribute "allowfullscreen"?...

html iframe w3c-validation

Can I use multiple main elements in a multipage document?...

html jquery-mobile w3c-validation wai-aria

Bad value for attribute action on element form: Must be non-empty...

php html w3c-validation

Attribute width and height not allowed on element symbol at this point...

html svg w3c w3c-validation

For document served with Refresh HTTP header, why does w3 validator get empty source code?...

php html codeigniter w3c-validation

W3C HTML validation errors: “Stray end tag </head>” and “Start tag <body> seen but an el...

html w3c-validation

Is <link> (not rel="stylesheet") allowed to be used in <body>?...

html w3c-validation