| Rule ID | Description | Impact | Standards |
|---|---|---|---|
| accesskeys | Ensures every accesskey attribute value is unique | Serious | Best practice |
| area-alt | Ensures <area> elements of image maps have alternate text | Critical | WCAG 2A |
| aria-allowed-attr | Ensures ARIA attributes are allowed for an element's role | Serious, Critical | WCAG 2A |
| aria-allowed-role | Ensures role attribute has an appropriate value for the element | Mild | Best practice |
| aria-hidden-body | Ensures aria-hidden='true' is not present on the document body. | Critical | WCAG 2A |
| aria-progressbar-name | Ensures every ARIA progressbar node has an accessible name | Serious | WCAG 2A |
| aria-required-attr | Ensures elements with ARIA roles have all required ARIA attributes | Critical | WCAG 2A |
| aria-required-children | Ensures elements with an ARIA role that require child roles contain them | Critical | WCAG 2A |
| aria-required-parent | Ensures elements with an ARIA role that require parent roles are contained by them | Critical | WCAG 2A |
| aria-roledescription | Ensure aria-roledescription is only used on elements with an implicit or explicit role | Serious | WCAG 2A |
| aria-roles | Ensures all elements with a role attribute use a valid value | Mild, Serious, Critical | WCAG 2A |
| aria-toggle-field-name | Ensures every ARIA toggle field has an accessible name | Moderate, Serious | WCAG 2A |
| aria-tooltip-name | Ensures every ARIA tooltip node has an accessible name | Serious | WCAG 2A |
| aria-valid-attr-value | Ensures all ARIA attributes have valid values | Serious, Critical | WCAG 2A |
| aria-valid-attr | Ensures attributes that begin with aria- are valid ARIA attributes | Critical | WCAG 2A |
| color-contrast | Ensures the contrast between foreground and background colors meets WCAG 2 AA minimum contrast ratio thresholds | Critical | WCAG 2AA, WCAG 2A |
| content-type | Ensures "meta content-type" and character set are defined | Moderate, Serious | Best practice |
| definition-list | Ensures <dl> elements are structured correctly | Serious | WCAG 2A |
| dlitem | Ensures <dt> and <dd> elements are contained by a <dl> | Serious | WCAG 2A |
| document-title | Ensures each HTML document contains a non-empty <title> element | Serious | WCAG 2A |
| duplicate-id | Ensures every id attribute value is unique | Mild | WCAG 2A |
| empty-heading | Ensures headings have discernible text | Mild | Best practice |
| heading-order | Ensures the order of headings is semantically correct | Moderate | Best practice |
| html-has-lang | Ensures every HTML document has a lang attribute | Serious | WCAG 2A |
| html-lang-valid | Ensures the lang attribute of the <html> element has a valid value | Serious | WCAG 2A |
| html-xml-lang-mismatch | Ensure that HTML elements with both valid lang and xml:lang attributes agree on the base language of the page | Moderate | WCAG 2A |
| image-alt | Ensures <img> elements have alternate text or a role of none or presentation | Critical | WCAG 2A |
| image-redundant-alt | Ensure image alternative is not repeated as text | Mild | Best practice |
| justification | Ensures body content is not center aligned | Mild | Best practice |
| landmark-no-duplicate-main | Ensures the document has at most one main landmark | Moderate | Best practice |
| landmark-unique | Landmarks should have a unique role or role/label/title (i.e. accessible name) combination | Moderate | Best practice |
| link-name | Ensures links have discernible text | Serious | WCAG 2A |
| list | Ensures that lists are structured correctly | Serious | WCAG 2A |
| listitem | Ensures <li> elements are used semantically | Serious | WCAG 2A |
| meta-viewport-large | Ensures <meta name="viewport"> can scale a significant amount | Mild | Best practice |
| meta-viewport | Ensures <meta name="viewport"> does not disable text scaling and zooming | Critical | WCAG 2AA, WCAG 2A |
| object-alt | Ensures <object> elements have alternate text | Serious | WCAG 2A |
| page-has-heading-one | Ensure that the page, or at least one of its frames contains a level-one heading | Moderate | Best practice |
| presentation-role-conflict | Flags elements whose role is none or presentation and which cause the role conflict resolution to trigger. | Mild | Best practice |
| role-img-alt | Ensures [role='img'] elements have alternate text | Serious | WCAG 2A |
| tabindex | Ensures tabindex attribute values are not greater than 0 | Serious | Best practice |
| table-roles | Ensures table roles are defined | Serious | Best practice |
| svg-img-alt | Ensures <svg> elements with an img, graphics-document or graphics-symbol role have an accessible text | Serious | WCAG 2A |
| valid-lang | Ensures lang attributes have valid values | Serious | WCAG 2AA, WCAG 2A |
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