w3c-validation Examples and Free Source Code

What's a minimally valid HTML5 document?...

html validation w3c-validation

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

html w3c-validation semantic-markup

Name attribute on details element...

html w3c-validation

'charset=iso-8859-1' with <!DOCTYPE HTML> is throwing a warning...

html character-encoding doctype w3c-validation

How do I fix "Error: A charset attribute on a meta element found after the first 512 bytes.&quo...

html w3c-validation

W3C validator shows new error: "Meta requires 'name' attribute"...

html facebook-opengraph html-meta w3c-validation rdfa

Why is /🌈 an invalid path when /a🌈 is valid?...

html emoji w3c-validation url-parsing

Using aria-sort in validated HTML5...

html accessibility w3c-validation wai-aria

How can I avoid the "Bad value language for attribute name on element meta" HTML validatio...

html html-meta w3c-validation

Best practice for meta data in a html document?...

html html-meta w3c-validation

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

html sitemap w3c-validation html-head

What elements can a span tag contain in HTML5?...

html w3c-validation web-standards

HTML error of multiple attribute for input type="text" with Rails datagrid gem...

html ruby-on-rails datagrid w3c-validation

W3C HTML validation error - Section lacks heading. Consider using h2-h6 elements to add identifying ...

html w3c-validation

Are (non-void) self-closing tags valid in HTML5?...

html syntax w3c-validation

Should I remove trailing slashes in meta tags?...

html html-meta w3c-validation html4

Convert read only fields for accessibility purposes...

accessibility wai-aria screen-readers w3c-validation uiaccessibility

Why can frontend frameworks can create custom attributes but I'm expected to prepend "data-...

html dom frontend w3c-validation

Adding ID attribute to all HTML elements of a web application?...

html w3c w3c-validation web-standards

Is it necessary to have <tbody> in every table?...

xhtml w3c semantic-markup w3c-validation

There is no attribute "allowtransparency" ...

html css w3c w3c-validation

W3C Validator offline on localhost by ajax...

javascript w3c w3c-validation adobe-brackets

W3C validator, CSS3 and Bootstrap...

css twitter-bootstrap w3c-validation

html 5 marquee tag error in w3c validation...

html w3c-validation marquee

HTML Email Validation?...

php html-email standards w3c-validation

Help with HTML validation error: Table column has no cells beginning in it...

html validation w3c-validation

"The frameborder attribute on the iframe element is obsolete. Use CSS instead."...

html iframe w3c-validation

W3C validator gives 'document type does not allow element "input" here...' error f...

html forms xhtml w3c-validation

How do you proceed html markup validation in your svelte app?...

html svelte w3c-validation

Are multiple angle brackets valid in HTML?...

html w3c-validation