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When none of the above prefixes are found, the value is assumed to be an ID and functions as though it were prefixed with id=.
Web Accessibility Rules Enabled
| Rule ID | Description |
|---|---|
| area-alt | Ensures <area> elements of image maps have alternate text |
| aria-allowed-attr | Ensures an element's role supports its ARIA attributes |
| aria-braille-equivalent | Ensure aria-braillelabel and aria-brailleroledescription have a non-braille equivalent |
| aria-command-name | Ensures every ARIA button, link and menuitem has an accessible name |
| aria-conditional-attr | Ensures ARIA attributes are used as described in the specification of the element's role |
| aria-deprecated-role | Ensures elements do not use deprecated roles |
| aria-hidden-body | Ensures aria-hidden="true" is not present on the document body. |
| aria-hidden-focus | Ensures aria-hidden elements are not focusable nor contain focusable elements |
| aria-input-field-name | Ensures every ARIA input field has an accessible name |
| aria-meter-name | Ensures every ARIA meter node has an accessible name |
| aria-progressbar-name | Ensures every ARIA progressbar node has an accessible name |
| aria-prohibited-attr | Ensures ARIA attributes are not prohibited for an element's role |
| aria-required-attr | Ensures elements with ARIA roles have all required ARIA attributes |
| aria-required-children | Ensures elements with an ARIA role that require child roles contain them |
| aria-required-parent | Ensures elements with an ARIA role that require parent roles are contained by them |
| aria-roles | Ensures all elements with a role attribute use a valid value |
| aria-toggle-field-name | Ensures every ARIA toggle field has an accessible name |
| aria-tooltip-name | Ensures every ARIA tooltip node has an accessible name |
| aria-valid-attr-value | Ensures all ARIA attributes have valid values |
| aria-valid-attr | Ensures attributes that begin with aria- are valid ARIA attributes |
| autocomplete-valid | Ensure the autocomplete attribute is correct and suitable for the form field |
| avoid-inline-spacing | Ensure that text spacing set through style attributes can be adjusted with custom stylesheets |
| blink | Ensures <blink> elements are not used |
| button-name | Ensures buttons have discernible text |
| bypass | Ensures each page has at least one mechanism for a user to bypass navigation and jump straight to the content |
| color-contrast | Ensures the contrast between foreground and background colors meets WCAG 2 AA minimum contrast ratio thresholds |
| definition-list | Ensures <dl> elements are structured correctly |
| dlitem | Ensures <dt> and <dd> elements are contained by a <dl> |
| document-title | Ensures each HTML document contains a non-empty <title> element |
| duplicate-id-aria | Ensures every id attribute value used in ARIA and in labels is unique |
| form-field-multiple-labels | Ensures form field does not have multiple label elements |
| frame-focusable-content | Ensures <frame> and <iframe> elements with focusable content do not have tabindex=-1 |
| frame-title-unique | Ensures <iframe> and <frame> elements contain a unique title attribute |
| frame-title | Ensures <iframe> and <frame> elements have an accessible name |
| html-has-lang | Ensures every HTML document has a lang attribute |
| html-lang-valid | Ensures the lang attribute of the <html> element has a valid value |
| html-xml-lang-mismatch | Ensure that HTML elements with both valid lang and xml:lang attributes agree on the base language of the page |
| image-alt | Ensures <img> elements have alternate text or a role of none or presentation |
| input-button-name | Ensures input buttons have discernible text |
| input-image-alt | Ensures <input type="image"> elements have alternate text |
| label | Ensures every form element has a label |
| link-in-text-block | Ensure links are distinguished from surrounding text in a way that does not rely on color |
| link-name | Ensures links have discernible text |
| list | Ensures that lists are structured correctly |
| listitem | Ensures <li> elements are used semantically |
| marquee | Ensures <marquee> elements are not used |
| meta-refresh | Ensures <meta http-equiv="refresh"> is not used for delayed refresh |
| meta-viewport | Ensures <meta name="viewport"> does not disable text scaling and zooming |
| nested-interactive | Ensures interactive controls are not nested as they are not always announced by screen readers or can cause focus problems for assistive technologies |
| no-autoplay-audio | Ensures <video> or <audio> elements do not autoplay audio for more than 3 seconds without a control mechanism to stop or mute the audio |
| object-alt | Ensures <object> elements have alternate text |
| role-img-alt | Ensures [role="img"] elements have alternate text |
| scrollable-region-focusable | Ensure elements that have scrollable content are accessible by keyboard |
| select-name | Ensures select element has an accessible name |
| server-side-image-map | Ensures that server-side image maps are not used |
| svg-img-alt | Ensures <svg> elements with an img, graphics-document or graphics-symbol role have an accessible text |
| td-headers-attr | Ensure that each cell in a table that uses the headers attribute refers only to other cells in that table |
| th-has-data-cells | Ensure that <th> elements and elements with role=columnheader/rowheader have data cells they describe |
| valid-lang | Ensures lang attributes have valid values |
| video-caption | Ensures <video> elements have captions |