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rule-descriptions.md

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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, wcag131 true
aria-input-field-name Ensures every ARIA input field has an accessible name Moderate, Serious 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-roledescription Ensure aria-roledescription is only used on elements with an implicit or explicit role Serious cat.aria, wcag2a, wcag412 true
aria-roles Ensures all elements with a role attribute use a valid value Serious, Critical cat.aria, wcag2a, wcag412 true
aria-toggle-field-name Ensures every ARIA toggle field has an accessible name Moderate, Serious 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
avoid-inline-spacing Ensure that text spacing set through style attributes can be adjusted with custom stylesheets Serious wcag21aa, wcag1412 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 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, deprecated false
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 image alternative is not repeated as text Minor cat.text-alternatives, best-practice true
input-button-name Ensures input buttons have discernible text Critical cat.name-role-value, wcag2a, wcag412, section508, section508.22.a 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
landmark-unique Landmarks must have a unique role or role/label/title (i.e. accessible name) combination 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, deprecated false
region Ensures all page content is contained by landmarks Moderate cat.keyboard, best-practice true
role-img-alt Ensures [role='img'] elements have alternate text Serious cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a true
scope-attr-valid Ensures the scope attribute is used correctly on tables Moderate, Critical cat.tables, best-practice true
scrollable-region-focusable Elements that have scrollable content should be accessible by keyboard Moderate wcag2a, wcag211 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, deprecated false