| accesskeys |
Ensures every accesskey attribute value is unique |
wcag2a, wcag211, cat.keyboard |
true |
| area-alt |
Ensures <area> elements of image maps have alternate text |
cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a |
true |
| aria-allowed-attr |
Ensures ARIA attributes are allowed for an element's role |
cat.aria, wcag2a, wcag411, wcag412 |
true |
| aria-hidden-body |
Ensures aria-hidden='true' is not present on the document body. |
cat.aria, wcag2a, wcag412 |
true |
| aria-required-attr |
Ensures elements with ARIA roles have all required ARIA attributes |
cat.aria, wcag2a, wcag411, wcag412 |
true |
| aria-required-children |
Ensures elements with an ARIA role that require child roles contain them |
cat.aria, wcag2a, wcag131 |
true |
| aria-required-parent |
Ensures elements with an ARIA role that require parent roles are contained by them |
cat.aria, wcag2a, wcag131 |
true |
| aria-roles |
Ensures all elements with a role attribute use a valid value |
cat.aria, wcag2a, wcag131, wcag411, wcag412 |
true |
| aria-valid-attr-value |
Ensures all ARIA attributes have valid values |
cat.aria, wcag2a, wcag131, wcag411, wcag412 |
true |
| aria-valid-attr |
Ensures attributes that begin with aria- are valid ARIA attributes |
cat.aria, wcag2a, wcag411 |
true |
| audio-caption |
Ensures <audio> elements have captions |
cat.time-and-media, wcag2a, wcag122, section508, section508.22.a |
true |
| blink |
Ensures <blink> elements are not used |
cat.time-and-media, wcag2a, wcag222, section508, section508.22.j |
true |
| button-name |
Ensures buttons have discernible text |
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 |
cat.keyboard, wcag2a, wcag241, section508, section508.22.o |
true |
| checkboxgroup |
Ensures related <input type="checkbox"> elements have a group and that that group designation is consistent |
cat.forms, best-practice |
true |
| color-contrast |
Ensures the contrast between foreground and background colors meets WCAG 2 AA contrast ratio thresholds |
cat.color, wcag2aa, wcag143 |
true |
| definition-list |
Ensures <dl> elements are structured correctly |
cat.structure, wcag2a, wcag131 |
true |
| dlitem |
Ensures <dt> and <dd> elements are contained by a <dl> |
cat.structure, wcag2a, wcag131 |
true |
| document-title |
Ensures each HTML document contains a non-empty <title> element |
cat.text-alternatives, wcag2a, wcag242 |
true |
| duplicate-id |
Ensures every id attribute value is unique |
cat.parsing, wcag2a, wcag411 |
true |
| empty-heading |
Ensures headings have discernible text |
cat.name-role-value, best-practice |
true |
| frame-title-unique |
Ensures <iframe> and <frame> elements contain a unique title attribute |
cat.text-alternatives, best-practice |
true |
| frame-title |
Ensures <iframe> and <frame> elements contain a non-empty title attribute |
cat.text-alternatives, wcag2a, wcag241, section508, section508.22.i |
true |
| heading-order |
Ensures the order of headings is semantically correct |
cat.semantics, best-practice |
false |
| hidden-content |
Informs users about hidden content. |
experimental, review-item |
false |
| href-no-hash |
Ensures that href values are valid link references to promote only using anchors as links |
cat.semantics, best-practice |
false |
| html-has-lang |
Ensures every HTML document has a lang attribute |
cat.language, wcag2a, wcag311 |
true |
| html-lang-valid |
Ensures the lang attribute of the <html> element has a valid value |
cat.language, wcag2a, wcag311 |
true |
| image-alt |
Ensures <img> elements have alternate text or a role of none or presentation |
cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a |
true |
| image-redundant-alt |
Ensure button and link text is not repeated as image alternative |
cat.text-alternatives, best-practice |
true |
| input-image-alt |
Ensures <input type="image"> elements have alternate text |
cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a |
true |
| label-title-only |
Ensures that every form element is not solely labeled using the title or aria-describedby attributes |
cat.forms, best-practice |
false |
| label |
Ensures every form element has a label |
cat.forms, wcag2a, wcag332, wcag131, section508, section508.22.n |
true |
| layout-table |
Ensures presentational <table> elements do not use <th>, <caption> elements or the summary attribute |
cat.semantics, wcag2a, wcag131 |
true |
| link-in-text-block |
Links can be distinguished without relying on color |
cat.color, experimental, wcag2a, wcag141 |
true |
| link-name |
Ensures links have discernible text |
cat.name-role-value, wcag2a, wcag111, wcag412, wcag244, section508, section508.22.a |
true |
| list |
Ensures that lists are structured correctly |
cat.structure, wcag2a, wcag131 |
true |
| listitem |
Ensures <li> elements are used semantically |
cat.structure, wcag2a, wcag131 |
true |
| marquee |
Ensures <marquee> elements are not used |
cat.parsing, wcag2a, wcag222 |
true |
| meta-refresh |
Ensures <meta http-equiv="refresh"> is not used |
cat.time, wcag2a, wcag2aaa, wcag221, wcag224, wcag325 |
true |
| meta-viewport-large |
Ensures <meta name="viewport"> can scale a significant amount |
cat.sensory-and-visual-cues, best-practice |
true |
| meta-viewport |
Ensures <meta name="viewport"> does not disable text scaling and zooming |
cat.sensory-and-visual-cues, wcag2aa, wcag144 |
true |
| object-alt |
Ensures <object> elements have alternate text |
cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a |
true |
| p-as-heading |
Ensure p elements are not used to style headings |
cat.semantics, wcag2a, wcag131, experimental |
true |
| radiogroup |
Ensures related <input type="radio"> elements have a group and that the group designation is consistent |
cat.forms, best-practice |
true |
| region |
Ensures all content is contained within a landmark region |
cat.keyboard, best-practice |
false |
| scope-attr-valid |
Ensures the scope attribute is used correctly on tables |
cat.tables, best-practice |
true |
| server-side-image-map |
Ensures that server-side image maps are not used |
cat.text-alternatives, wcag2a, wcag211, section508, section508.22.f |
true |
| skip-link |
Ensures the first link on the page is a skip link |
cat.keyboard, best-practice |
false |
| tabindex |
Ensures tabindex attribute values are not greater than 0 |
cat.keyboard, best-practice |
true |
| table-duplicate-name |
Ensure that tables do not have the same summary and caption |
cat.tables, best-practice |
true |
| table-fake-caption |
Ensure that tables with a caption use the <caption> element. |
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 |
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 |
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 |
cat.tables, wcag2a, wcag131, section508, section508.22.g |
true |
| valid-lang |
Ensures lang attributes have valid values |
cat.language, wcag2aa, wcag312 |
true |
| video-caption |
Ensures <video> elements have captions |
cat.text-alternatives, wcag2a, wcag122, wcag123, section508, section508.22.a |
true |
| video-description |
Ensures <video> elements have audio descriptions |
cat.text-alternatives, wcag2aa, wcag125, section508, section508.22.b |
true |