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features.md

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Features

A list of every a11y concern Checka11y.css will check for and highlight with links to relevant guidelines or techniques:

Errors

  • E0000: Checks for invalid interactive HTML elements elements nested inside of a <button>.
  • E0001: Checks that every <button> has meaningful content.
  • E0002: Checks that all instances of the dir attribute is only set to ltr, rtl or auto.
  • E0003: Checks that headings are not empty.
  • E0004: Checks that headings are reachable by assistive technologies.
  • E0005: Checks headings are in a semantic order.
  • E0006: Checks that the lang attribute exists on the <html> element and that is is not empty.
  • E0007: Checks for missing title attribute on <iframe> elements.
  • E0008: Checks for missing alt attributes on images.
  • E0009: Checks for invalid interactive HTML elements elements nested inside of an <a>.
  • E0010: Checks that every <a> has meaningful content.
  • E0011: Checks <li>, <script> and <template> are the only direct children of <ol> and <ul>.
  • E0012: Checks <dt> and <dd> are the only direct children of <dl>.
  • E0013: Checks if <nav> exists more than once on a page, that each nav is correctly labelled.
  • E0014: Checks for a tab index value of -1 on commonly tabbed to elements.
  • E0015: Checks for an image with a longdesc pointing to an image.
  • E0016: Checks for an image with an empty longdesc.
  • E0017: Checks for an empty <title> in the <head>.
  • E0018: Checks for an <head> without a <title> element inside.

Warnings

  • W0000: Checks for the use of accesskey and warns due to accessibility, internationalisation and browser support concerns.
  • W0001: Checks to see if any <video> and <audio> elements have the autoplay attribute set.
  • W0002: Checks and warns about using mouse event handlers on HTML elements that are potentially not reachable from the keyboard.
  • W0003: Checks that alt attributes on images have meaningful content.
  • W0004: Checks for !important inline styles thay may override end-user's custom stylesheets.
  • W0005: Checks for <span> and <em> elements that could potentially break up spoken text.
  • W0006: Checks for <a target="_blank"> and warns about links that open in a new window.
  • W0007: Checks for <u> being confused as hyperlinks.
  • W0008: Checks for the use of the title attribute due to accessibility concerns.
  • W0009: Checks for focusable elements inside aria-hidden="true" elements.
  • W0010: Checks for heading elements containing role="text" attribute.
  • W0011: Checks for anchor tags that are used as buttons.
  • W0012: Checks for heading element inside <section> element.
  • W0013: Checks for anchor tags that contain a link to a PDF, Word, Excel, or PowerPoint document.
  • W0014: Checks for anchor tags that contain a link to content site.
  • W0015: Checks for images with the longdesc attribute.
  • W0016: Checks for zoom/scale being disabled in the meta viewport.
  • W0017: Checks if interactive elements contain aria-hidden="true".