| Rule ID | Description | Impact | Tags | Enabled by default | | :---------------------------------- | :------------------------------------------------------------------------------------------------------------------------- | :----------------- | :--------------------------------------------------------------------------- | :----------------- | | accesskeys | Ensures every accesskey attribute value is unique | Serious | best-practice, cat.keyboard | true | | area-alt | Ensures <area> elements of image maps have alternate text | Critical | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true | | aria-allowed-attr | Ensures ARIA attributes are allowed for an element's role | Critical | cat.aria, wcag2a, wcag412 | true | | aria-allowed-role | Ensures role attribute has an appropriate value for the element | Minor | cat.aria, best-practice | true | | aria-dpub-role-fallback | Ensures unsupported DPUB roles are only used on elements with implicit fallback roles | Moderate | cat.aria, wcag2a, wcag131 | true | | aria-hidden-body | Ensures aria-hidden='true' is not present on the document body. | Critical | cat.aria, wcag2a, wcag412 | true | | aria-hidden-focus | Ensures aria-hidden elements do not contain focusable elements | Serious | cat.name-role-value, wcag2a, wcag412 | true | | aria-required-attr | Ensures elements with ARIA roles have all required ARIA attributes | Critical | cat.aria, wcag2a, wcag412 | true | | aria-required-children | Ensures elements with an ARIA role that require child roles contain them | Critical | cat.aria, wcag2a, wcag131 | true | | aria-required-parent | Ensures elements with an ARIA role that require parent roles are contained by them | Critical | cat.aria, wcag2a, wcag131 | true | | aria-roles | Ensures all elements with a role attribute use a valid value | Serious, Critical | cat.aria, wcag2a, wcag412 | true | | aria-valid-attr-value | Ensures all ARIA attributes have valid values | Critical | cat.aria, wcag2a, wcag412 | true | | aria-valid-attr | Ensures attributes that begin with aria- are valid ARIA attributes | Critical | cat.aria, wcag2a, wcag412 | true | | audio-caption | Ensures <audio> elements have captions | Critical | cat.time-and-media, wcag2a, wcag121, section508, section508.22.a | false | | autocomplete-valid | Ensure the autocomplete attribute is correct and suitable for the form field | Serious | cat.forms, wcag21aa, wcag135 | true | | blink | Ensures <blink> elements are not used | Serious | cat.time-and-media, wcag2a, wcag222, section508, section508.22.j | true | | button-name | Ensures buttons have discernible text | Serious, Critical | cat.name-role-value, wcag2a, wcag412, section508, section508.22.a | true | | bypass | Ensures each page has at least one mechanism for a user to bypass navigation and jump straight to the content | Serious | cat.keyboard, wcag2a, wcag241, section508, section508.22.o | true | | checkboxgroup | Ensures related <input type="checkbox"> elements have a group and that the group designation is consistent | Critical | cat.forms, best-practice | true | | color-contrast | Ensures the contrast between foreground and background colors meets WCAG 2 AA contrast ratio thresholds | Serious | cat.color, wcag2aa, wcag143 | true | | css-orientation-lock | Ensures content is not locked to any specific display orientation, and the content is operable in all display orientations | Serious | cat.structure, wcag134, wcag21aa, experimental | true | | definition-list | Ensures <dl> elements are structured correctly | Serious | cat.structure, wcag2a, wcag131 | true | | dlitem | Ensures <dt> and <dd> elements are contained by a <dl> | Serious | cat.structure, wcag2a, wcag131 | true | | document-title | Ensures each HTML document contains a non-empty <title> element | Serious | cat.text-alternatives, wcag2a, wcag242 | true | | duplicate-id-active | Ensures every id attribute value of active elements is unique | Serious | cat.parsing, wcag2a, wcag411 | true | | duplicate-id-aria | Ensures every id attribute value used in ARIA and in labels is unique | Critical | cat.parsing, wcag2a, wcag411 | true | | duplicate-id | Ensures every id attribute value is unique | Minor | cat.parsing, wcag2a, wcag411 | true | | empty-heading | Ensures headings have discernible text | Minor | cat.name-role-value, best-practice | true | | focus-order-semantics | Ensures elements in the focus order have an appropriate role | Minor | cat.keyboard, best-practice, experimental | true | | form-field-multiple-labels | Ensures form field does not have multiple label elements | Moderate | cat.forms, wcag2a, wcag332 | true | | frame-tested | Ensures <iframe> and <frame> elements contain the axe-core script | Critical | cat.structure, review-item, best-practice | true | | frame-title-unique | Ensures <iframe> and <frame> elements contain a unique title attribute | Serious | cat.text-alternatives, best-practice | true | | frame-title | Ensures <iframe> and <frame> elements contain a non-empty title attribute | Serious | cat.text-alternatives, wcag2a, wcag241, wcag412, section508, section508.22.i | true | | heading-order | Ensures the order of headings is semantically correct | Moderate | cat.semantics, best-practice | true | | hidden-content | Informs users about hidden content. | Minor | cat.structure, experimental, review-item, best-practice | true | | html-has-lang | Ensures every HTML document has a lang attribute | Serious | cat.language, wcag2a, wcag311 | true | | html-lang-valid | Ensures the lang attribute of the <html> element has a valid value | Serious | cat.language, wcag2a, wcag311 | true | | 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 | cat.language, wcag2a, wcag311 | true | | image-alt | Ensures <img> elements have alternate text or a role of none or presentation | Critical | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true | | image-redundant-alt | Ensure button and link text is not repeated as image alternative | Minor | cat.text-alternatives, best-practice | true | | input-image-alt | Ensures <input type="image"> elements have alternate text | Critical | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true | | label-content-name-mismatch | Ensures that elements labelled through their content must have their visible text as part of their accessible name | Serious | wcag21a, wcag253, experimental | true | | label-title-only | Ensures that every form element is not solely labeled using the title or aria-describedby attributes | Serious | cat.forms, best-practice | true | | label | Ensures every form element has a label | Minor, Critical | cat.forms, wcag2a, wcag332, wcag131, section508, section508.22.n | true | | landmark-banner-is-top-level | Ensures the banner landmark is at top level | Moderate | cat.semantics, best-practice | true | | landmark-complementary-is-top-level | Ensures the complementary landmark or aside is at top level | Moderate | cat.semantics, best-practice | true | | landmark-contentinfo-is-top-level | Ensures the contentinfo landmark is at top level | Moderate | cat.semantics, best-practice | true | | landmark-main-is-top-level | Ensures the main landmark is at top level | Moderate | cat.semantics, best-practice | true | | landmark-no-duplicate-banner | Ensures the document has at most one banner landmark | Moderate | cat.semantics, best-practice | true | | landmark-no-duplicate-contentinfo | Ensures the document has at most one contentinfo landmark | Moderate | cat.semantics, best-practice | true | | landmark-one-main | Ensures the document has only one main landmark and each iframe in the page has at most one main landmark | Moderate | cat.semantics, best-practice | true | | layout-table | Ensures presentational <table> elements do not use <th>, <caption> elements or the summary attribute | Serious | cat.semantics, wcag2a, wcag131 | true | | link-in-text-block | Links can be distinguished without relying on color | Serious | cat.color, experimental, wcag2a, wcag141 | true | | link-name | Ensures links have discernible text | Serious | cat.name-role-value, wcag2a, wcag412, wcag244, section508, section508.22.a | true | | list | Ensures that lists are structured correctly | Serious | cat.structure, wcag2a, wcag131 | true | | listitem | Ensures <li> elements are used semantically | Serious | cat.structure, wcag2a, wcag131 | true | | marquee | Ensures <marquee> elements are not used | Serious | cat.parsing, wcag2a, wcag222 | true | | meta-refresh | Ensures <meta http-equiv="refresh"> is not used | Critical | cat.time, wcag2a, wcag2aaa, wcag221, wcag224, wcag325 | true | | meta-viewport-large | Ensures <meta name="viewport"> can scale a significant amount | Minor | cat.sensory-and-visual-cues, best-practice | true | | meta-viewport | Ensures <meta name="viewport"> does not disable text scaling and zooming | Critical | cat.sensory-and-visual-cues, wcag2aa, wcag144 | true | | object-alt | Ensures <object> elements have alternate text | Serious | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true | | p-as-heading | Ensure p elements are not used to style headings | Serious | cat.semantics, wcag2a, wcag131, experimental | true | | page-has-heading-one | Ensure that the page, or at least one of its frames contains a level-one heading | Moderate | cat.semantics, best-practice | true | | radiogroup | Ensures related <input type="radio"> elements have a group and that the group designation is consistent | Critical | cat.forms, best-practice | true | | region | Ensures all page content is contained by landmarks | Moderate | cat.keyboard, best-practice | true | | scope-attr-valid | Ensures the scope attribute is used correctly on tables | Moderate, Critical | cat.tables, best-practice | true | | server-side-image-map | Ensures that server-side image maps are not used | Minor | cat.text-alternatives, wcag2a, wcag211, section508, section508.22.f | true | | skip-link | Ensure all skip links have a focusable target | Moderate | cat.keyboard, best-practice | true | | tabindex | Ensures tabindex attribute values are not greater than 0 | Serious | cat.keyboard, best-practice | true | | table-duplicate-name | Ensure that tables do not have the same summary and caption | Minor | cat.tables, best-practice | true | | table-fake-caption | Ensure that tables with a caption use the <caption> element. | Serious | cat.tables, experimental, wcag2a, wcag131, section508, section508.22.g | true | | td-has-header | Ensure that each non-empty data cell in a large table has one or more table headers | Critical | cat.tables, experimental, wcag2a, wcag131, section508, section508.22.g | true | | td-headers-attr | Ensure that each cell in a table using the headers refers to another cell in that table | Serious | cat.tables, wcag2a, wcag131, section508, section508.22.g | true | | th-has-data-cells | Ensure that each table header in a data table refers to data cells | Serious | cat.tables, wcag2a, wcag131, section508, section508.22.g | true | | valid-lang | Ensures lang attributes have valid values | Serious | cat.language, wcag2aa, wcag312 | true | | video-caption | Ensures <video> elements have captions | Critical | cat.text-alternatives, wcag2a, wcag122, section508, section508.22.a | true | | video-description | Ensures <video> elements have audio descriptions | Critical | cat.text-alternatives, wcag2aa, wcag125, section508, section508.22.b | true |