Accessibility

Checklist

  • Every page should have a meaningful title, like "BRAND, PAGE_NAME" e.g. "chessmail, Lobby"
  • Use Landmarks <header>, <nav>, <main>, <footer>...
  • Pages should have a correct heading structure
  • Every page should have an <H1>, which in worst case could be visually hidden
  • Make all interactive page elements accessible via "tab"

What is the most used screen-reader

Test your web pages with the most used screen reader, it is Apples "Voice Over". "Voice Over" is build into every Mac, iPad and iPhone.

Testing your web pages with "Voice Over", will open your eyes.

Accessible SVG

ARIA-Attributes

Does a logo needs an alt-text?

How to label links

"skip to content" link

Do screen readers read the page title?

"Visually hidden" is the new "screenreader only"

The css code for .visually-hidden

.visually-hidden {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

See also: https://webaim.org/techniques/css/invisiblecontent/

aria-hidden

Adding aria-hidden="true" to an element removes that element and all of its children from the accessibility tree. This can improve the experience for assistive technology users by hiding:

  • Purely decorative content, such as icons or images
  • Duplicated content, such as repeated text
  • Offscreen or collapsed content, such as menus

Aria labelling


<div role="dialog" aria-labelledby="dialogheader">
    <h2 id="dialogheader">Choose a File</h2>
    ... Dialog contents
    <button aria-label="close" aria-describedby="descriptionClose"
            onclick="myDialog.close()">X
    </button>
    ...
    <div id="descriptionClose">
        Beim Schließen diese Fensters werden eigegebenen Daten verworfen.
        Sie werden zur Hauptseite zurückgeleitet.
    </div>
</div>
  • aria-labelledby: id of the label
  • aria-describedby: id of the description (optional)
  • aria-label: The label, should be in the websites language

Newline in alt attribute or title

HTML

<img src="image.jpg" alt="Line 1
Line 2"/>

CSS

img {
    white-space: pre
}

Role Attribute

Definition of roles

https://www.w3.org/TR/2014/REC-wai-aria-20140320/roles#role_definitions