XML: Not well-formed (invalid token)...

Should I use a custom ARIA attribute if there is no suitable ARIA attribute exists?...

Is speechsynthesis API officially provided by HTML5?...

W3C validator says 'feed does not validate' 'url must be a full URL'... whats wrong ...

Why can't we set color in a col tag?...

Fallback for CSS attributes without unit...

Lazy loading (data-src2) Jssor Slider doesn't validate against w3 standards...

If <a name="..."> is obsolete, what is preferred?...

Possible values of refX, refY in an SVG marker...

Pipe Chars in HTML Classes...

getElementById return null for xml document in java...

Can a td be inside a td...

rel="tooltip", is it bad practice?...

Selenium JSON Wire Protocol vs Webdriver Wire Protocol...

Dynamic W3C Validation...

W3C compliant HTMl and CSS...

How CSS module level number is being chosen by W3C?...

xml:space="preserve" effect on space between XML attributes?...

How to revoke given permission in Chrome and Firefox?...

Writing a xml:id attribute with lxml...

W3C errors for duplicate id's...

css 1, css 2, css 2.1 and css 3 , which css properties and selectors are different/new in each versi...

Are Block-Level Boxes Enclosed in Line Boxes?...

Contradiction in Definition of Inline-Level Boxes and Inline Boxes (W3C)...

What Are "Non-Replaced Inline Blocks"?...

How to check if a listener event is a passive event?...

Why svg text disappears when setting x and y to 0?...

What's the difference between "//W3C//DTD HTML 4.01" and "//W3C//DTD XHTML 1.0&qu...

Does W3C offer an explanation of the additional user-related benefits of increased Levels (A through...

Why WCAG made 3 level "A", "AA" and "AAA"?...