Reference

Every check we run, and what to do when it fails

75 checks map to a WCAG success criterion. Another 30 are good practice that no criterion requires — we report them separately so a compliance conversation stays about compliance.

ARIA

criticalaria-allowed-attrElements must only use supported ARIA attributes4.1.2

criticalaria-hidden-bodyaria-hidden="true" must not be present on the document body1.3.1, 4.1.2

criticalaria-required-attrRequired ARIA attributes must be provided4.1.2

criticalaria-required-childrenCertain ARIA roles must contain particular children1.3.1

criticalaria-required-parentCertain ARIA roles must be contained by particular parents1.3.1

criticalaria-rolesARIA roles used must conform to valid values4.1.2

criticalaria-valid-attrARIA attributes must conform to valid names4.1.2

criticalaria-valid-attr-valueARIA attributes must conform to valid values4.1.2

seriousaria-braille-equivalentaria-braille attributes must have a non-braille equivalent4.1.2

seriousaria-command-nameARIA commands must have an accessible name4.1.2

seriousaria-conditional-attrARIA attributes must be used as specified for the element's role4.1.2

seriousaria-input-field-nameARIA input fields must have an accessible name4.1.2

seriousaria-meter-nameARIA meter nodes must have an accessible name1.1.1

seriousaria-progressbar-nameARIA progressbar nodes must have an accessible name1.1.1

seriousaria-prohibited-attrElements must only use permitted ARIA attributes4.1.2

seriousaria-roledescriptionaria-roledescription must be on elements with a semantic role4.1.2

seriousaria-tab-nameARIA tab nodes must have an accessible name4.1.2

seriousaria-toggle-field-nameARIA toggle fields must have an accessible name4.1.2

seriousaria-tooltip-nameARIA tooltip nodes must have an accessible name4.1.2

minoraria-deprecated-roleDeprecated ARIA roles must not be used4.1.2

Colour

seriouscolor-contrastElements must meet minimum color contrast ratio thresholds1.4.3

seriouscolor-contrast-enhancedElements must meet enhanced color contrast ratio thresholds1.4.6

seriouslink-in-text-blockLinks must be distinguishable without relying on color1.4.1

Forms

criticallabelForm elements must have labels4.1.2

criticalselect-nameSelect element must have an accessible name4.1.2

seriousautocomplete-validautocomplete attribute must be used correctly1.3.5

moderateform-field-multiple-labelsForm field must not have multiple label elements3.3.2

Keyboard

seriousbypassPage must have means to bypass repeated blocks2.4.1

seriousframe-focusable-contentFrames with focusable content must not have tabindex=-12.1.1

seriousnested-interactiveInteractive controls must not be nested4.1.2

seriousscrollable-region-focusableScrollable region must have keyboard access2.1.1, 2.1.3

Language

serioushtml-has-lang<html> element must have a lang attribute3.1.1

serioushtml-lang-valid<html> element must have a valid value for the lang attribute3.1.1

seriousvalid-langlang attribute must have a valid value3.1.2

moderatehtml-xml-lang-mismatchHTML elements with lang and xml:lang must have the same base language3.1.1

Name, role, value

criticalbutton-nameButtons must have discernible text4.1.2

criticalinput-button-nameInput buttons must have discernible text4.1.2

seriousaria-hidden-focusARIA hidden element must not be focusable or contain focusable elements4.1.2

seriouslink-nameLinks must have discernible text2.4.4, 4.1.2

serioussummary-nameSummary elements must have discernible text4.1.2

Parsing

criticalduplicate-id-ariaIDs used in ARIA and labels must be unique4.1.2

seriousduplicate-id-activeIDs of active elements must be unique4.1.1

seriousmarquee<marquee> elements are deprecated and must not be used2.2.2

minorduplicate-idid attribute value must be unique4.1.1

Semantics

seriouslabel-content-name-mismatchElements must have their visible text as part of their accessible name2.5.3

seriousp-as-headingStyled <p> elements must not be used as headings1.3.1

minoridentical-links-same-purposeLinks with the same name must have a similar purpose2.4.9

Sensory and visual cues

criticalmeta-viewportZooming and scaling must not be disabled1.4.4

serioustarget-sizeAll touch targets must be 24px large, or leave sufficient space2.5.8

Structure

seriousavoid-inline-spacingInline text spacing must be adjustable with custom stylesheets1.4.12

seriouscss-orientation-lockCSS Media queries must not lock display orientation1.3.4

seriousdefinition-list<dl> elements must only directly contain properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements1.3.1

seriousdlitem<dt> and <dd> elements must be contained by a <dl>1.3.1

seriouslist<ul> and <ol> must only directly contain <li>, <script> or <template> elements1.3.1

seriouslistitem<li> elements must be contained in a <ul> or <ol>1.3.1

Tables

criticaltd-has-headerNon-empty <td> elements in larger <table> must have an associated table header1.3.1

serioustable-fake-captionData or header cells must not be used to give caption to a data table.1.3.1

serioustd-headers-attrTable cell headers attributes must refer to other <th> elements in the same table1.3.1

seriousth-has-data-cellsTable headers in a data table must refer to data cells1.3.1

Text alternatives

criticalarea-altActive <area> elements must have alternative text2.4.4, 4.1.2

criticalimage-altImages must have alternative text1.1.1

criticalinput-image-altImage buttons must have alternative text1.1.1, 4.1.2

criticalvideo-caption<video> elements must have captions1.2.2

seriousdocument-titleDocuments must have <title> element to aid in navigation2.4.2

seriousframe-titleFrames must have an accessible name4.1.2

seriousframe-title-uniqueFrames must have a unique title attribute4.1.2

seriousobject-alt<object> elements must have alternative text1.1.1

seriousrole-img-alt[role="img"] and [role="image"] elements must have alternative text1.1.1

serioussvg-img-alt<svg> elements with an img or image role must have alternative text1.1.1

minorserver-side-image-mapServer-side image maps must not be used2.1.1

Time and media

criticalaudio-caption<audio> elements must have a captions track1.2.1

criticalmeta-refreshDelayed refresh under 20 hours must not be used2.2.1

seriousblink<blink> elements are deprecated and must not be used2.2.2

moderateno-autoplay-audio<video> or <audio> elements must not play automatically1.4.2

minormeta-refresh-no-exceptionsDelayed refresh must not be used2.2.4, 3.2.5

Best practice, not conformance

These catch real problems, but failing one does not fail WCAG. They are off by default on scheduled scans so your score means what it says.

seriousaccesskeysaccesskey attribute value should be uniqueadvice

minoraria-allowed-roleARIA role should be appropriate for the elementadvice

seriousaria-dialog-nameARIA dialog and alertdialog nodes should have an accessible nameadvice

seriousaria-text"role=text" should have no focusable descendantsadvice

seriousaria-treeitem-nameARIA treeitem nodes should have an accessible nameadvice

seriousempty-headingHeadings should not be emptyadvice

minorempty-table-headerTable header text should not be emptyadvice

minorfocus-order-semanticsElements in the focus order should have an appropriate roleadvice

criticalframe-testedFrames should be tested with axe-coreadvice

moderateheading-orderHeading levels should only increase by oneadvice

minorhidden-contentHidden content on the page should be analyzedadvice

minorimage-redundant-altAlternative text of images should not be repeated as textadvice

seriouslabel-title-onlyForm elements should have a visible labeladvice

moderatelandmark-banner-is-top-levelBanner landmark should not be contained in another landmarkadvice

moderatelandmark-complementary-is-top-levelAside should not be contained in another landmarkadvice

moderatelandmark-contentinfo-is-top-levelContentinfo landmark should not be contained in another landmarkadvice

moderatelandmark-main-is-top-levelMain landmark should not be contained in another landmarkadvice

moderatelandmark-no-duplicate-bannerDocument should not have more than one banner landmarkadvice

moderatelandmark-no-duplicate-contentinfoDocument should not have more than one contentinfo landmarkadvice

moderatelandmark-no-duplicate-mainDocument should not have more than one main landmarkadvice

moderatelandmark-one-mainDocument should have one main landmarkadvice

moderatelandmark-uniqueLandmarks should have a unique role or role/label/title (i.e. accessible name) combinationadvice

minormeta-viewport-largeUsers should be able to zoom and scale the text up to 500%advice

moderatepage-has-heading-onePage should contain a level-one headingadvice

minorpresentation-role-conflictElements marked as presentational should be consistently ignoredadvice

moderateregionAll page content should be contained by landmarksadvice

criticalscope-attr-validscope attribute should be used correctlyadvice

moderateskip-linkThe skip-link target should exist and be focusableadvice

serioustabindexElements should not have tabindex greater than zeroadvice

minortable-duplicate-nameTables should not have the same summary and captionadvice