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Code Inspections in HTML

Accessibility

Inspection	Description	Default Severity
Missing associated label	Reports a form element (`input`, `textarea`, or `select`) without an associated label. Suggests creating a new label. Based on WCAG 2.0: H44.	Warning
Missing required 'alt' attribute	Reports a missing `alt` attribute in a `img` or `applet` tag or in a `area` element of an image map. Suggests adding a required attribute with a text alternative for the contents of the tag. Based on WCAG 2.0: H24, H35, H36, H37.	Warning
Missing required 'lang' attribute	Reports a missing `lang` (or `xml:lang`) attribute in a `html` tag. Suggests adding a required attribute to state the default language of the document. Based on WCAG 2.0: H57.	Warning
Missing required 'summary' attribute	Reports a missing `summary` attribute in a `table` tag. Suggests adding a `summary` attribute. Based on WCAG 2.0: H73.	Disabled
Missing required 'title' attribute	Reports a missing title attribute `frame`, `iframe`, `dl`, and `a` tags. Suggests adding a title attribute. Based on WCAG 2.0: H33, H40, and H64.	Disabled
Missing required 'title' element	Reports a missing `title` element inside a `head` section. Suggests adding a `title` element. The title should describe the document. Based on WCAG 2.0: H25.	Warning

Other inspections

Inspection	Description	Default Severity
Empty tag	Reports empty tags that do not work in some browsers. Example: `<html> <script/> </html>` After the quick-fix is applied: `<html> <script></script> </html>`	Warning
Incorrect boolean attribute	Reports an HTML non-boolean attribute without a value. Suggests configuring attributes that should not be reported.	Warning
Malformed content of 'script' tag	Reports contents of `script` tags that are invalid XML. Example: `<script type="text/javascript"> console.log('<'); </script>` After the quick-fix is applied: `<script type="text/javascript"> console.log('<'); </script>`	Error
Mismatched image size	Reports a `width` and `height` attribute value of a `img` tag that is different from the actual width and height of the referenced image.	Warning
Missing closing tag	Reports an HTML element without a closing tag. Some coding styles require that HTML elements have closing tags even where this is optional. Example: `<html> <body> <p>Behold! </body> </html>` After the quick-fix is applied: `<html> <body> <p>Behold!</p> </body> </html>`	No highlighting, only fix
Missing required attribute	Reports a missing mandatory attribute in an XML/HTML tag. Suggests configuring attributes that should not be reported.	Warning
Obsolete attribute	Reports an obsolete HTML5 attribute.	Warning
Obsolete tag	Reports an obsolete HTML5 tag. Suggests replacing the obsolete tag with a CSS or another tag.	Warning
Presentational tag	Reports a presentational HTML tag. Suggests replacing the presentational tag with a CSS or another tag.	Disabled
Redundant closing tag	Reports redundant closing tags on empty elements, for example, `img` or `br`. Example: `<html> <body> <br></br> </body> </html>` After the quick-fix is applied: `<html> <body> <br> </body> </html>`	Warning
Unknown attribute	Reports an unknown HTML attribute. Suggests configuring attributes that should not be reported.	Warning
Unknown tag	Reports an unknown HTML tag. Suggests configuring tags that should not be reported.	Warning
Unresolved file in a link	Reports an unresolved file in a link.	Warning
Unresolved fragment in a link	Reports an unresolved last part of an URL after the `#` sign.	Warning
Unresolved web link	Reports an unresolved web link. Works by making network requests in the background.	Disabled
Wrong attribute value	Reports an incorrect HTML attribute value.	Warning

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