rule-descriptions.md

Rule ID	Description	Tags
accesskeys	Ensures every accesskey attribute value is unique	wcag2a, wcag211
area-alt	Ensures <area> elements of image maps have an alternate text	wcag2a, wcag111, section508, section508a
aria-allowed-attr	Ensures all attributes that start with 'aria-' are valid for an element's role	wcag2a, wcag411
aria-required-attr	Ensures all elements that contain WAI-ARIA roles to ensure that all required ARIA attributes are present	wcag2a, wcag411
aria-required-children	Checks all elements that contain a WAI-ARIA role to ensure that all required children roles are present	wcag2a, wcag411
aria-required-parent	Checks all elements that contain a WAI-ARIA role to ensure that all required parent roles are present	wcag2a, wcag411
aria-roles	Ensures all elements with a role attribute use a valid value	wcag2a, wcag411
aria-valid-attr-value	Ensures all WAI-ARIA atributes to have valid values	wcag2a, wcag411
aria-valid-attr	Ensures all attributes that begin with aria- are valid WAI-ARIA attributes	wcag2a, wcag411
audio-caption	Ensures <audio> elements contain a <caption> element	wcag2a, wcag122, section508, section508a
blink	Ensures the <blink> element is not used	wcag2a, wcag222
button-name	Ensures all buttons have a discernible alternate text	wcag2a, wcag412, section508, section508a
bypass	Ensures that each page has at least one mechanism for a keyboard-only user to bypass the navigation and jump straight to the content	wcag2a, wcag241, section508, section508o
checkboxgroup	Ensures that all <input type="checkbox"> groups have a group and that that group designation is consistent	wcag2a, wcag131
color-contrast	Ensures the contrast between the foreground and the background colors meets the WCAG 2 AA contrast ratio thresholds	wcag2aa, wcag143
data-table	Ensures that data tables are marked up semantically and have the correct header structure	wcag2a, wcag131
definition-list	Ensures that all <dl> elements are structured correctly	wcag2a, wcag131
dlitem	Ensures that all <dt> and <dd> elements have a <dl> as a parent	wcag2a, wcag131
document-title	Ensures each HTML document contains a non-empty <title> element	wcag2a, wcag242
duplicate-id	Ensures every id attribute value is unique	wcag2a, wcag411
empty-heading	Ensures that headings on the page do not contain empty text	wcag2a, wcag131
frame-title	Ensures that all iframe and frame elements contain a unique and non-empty title attribute	wcag2a, wcag241
heading-order	Ensures that the order in which the headings appear in the DOM is semantically correct	best-practice
html-lang	Ensures every HTML document has a lang attribute and its value is valid	wcag2a, wcag311
image-alt	Ensures that every <img> element has alternate text or has a role of none or presentational	wcag2a, wcag111, section508, section508a
input-image-alt	Ensures that every <input type="image"> has alternate text	wcag2a, wcag111, section508, section508a
label-title-only	Ensures that every <input> that requires a label is not only labeled using the title attribute	best-practice
label	Ensures every form element has an appropriate label	wcag2a, wcag332, wcag131, section508, section508n
layout-table	Ensures presentational <table> elements do not use <th>, <caption> elements or the summary attribute	wcag2a, wcag131
link-name	Ensures that every link has discernible text	wcag2a, wcag111, wcag412, section508, section508a
list	Ensures that lists are structured correctly	wcag2a, wcag131
listitem	Ensures that every list item is used semantically	wcag2a, wcag131
marquee	Ensures that the <marquee> element is not used	wcag2a, wcag222, section508, section508j
meta-refresh	Ensures that <meta http-equiv="refresh"> is not used	wcag2a, wcag2aaa, wcag221, wcag224, wcag325
meta-viewport	Ensures that when <meta name="viewport"> is used, it does not disable text scaling and zooming	wcag2aa, wcag144
object-alt	Ensures that every <object> element has alternate text	wcag2a, wcag111
radiogroup	Ensures that all <input type="radio"> groups have a group and that that group designation is consistent	wcag2a, wcag131
region	Ensures all content on the page is contained within a landmark region	best-practice
scope	Ensures that the scope attribute is used correctly on tables	best-practice
server-side-image-map	Ensures that server-side image maps are not used	wcag2a, wcag211, section508, section508f
skip-link	Ensures the first link on the page is a skip link	best-practice
tabindex	Ensures that explicit tabindex attributes that are greater than 0 are not used	best-practice
valid-lang	Ensures lang attributes have valid values	wcag2aa, wcag312
video-caption	Ensures <video> elements have captions	wcag2a, wcag122, wcag123, section508, section508a
video-description	Ensures <video> elements have an audio description	wcag2aa, wcag125, section508, section508a