Accessibility

Missing associated label  

Reports a form element (input, textarea, or select) without an associated label.

Missing required 'alt' attribute  

Reports a missing alt attribute in a img or applet tag or in a area element of an image map.

Missing required 'lang' attribute  

Reports a missing lang (or xml:lang) attribute in a html tag.

Missing required 'summary' attribute  

Reports a missing summary attribute in a table tag.

Missing required 'title' attribute  

Reports a missing title attribute frame, iframe, dl, and a tags.

Missing required 'title' element  

Reports a missing title element inside a head section.