Technique F99:Failure of Success Criterion 2.1.4 due to implementing character key shortcuts that cannot be turned off or remapped

Applicability

This failure applies to web content that can be interacted with using a physical keyboard as input mechanism.

This technique relates to 2.1.4: Character Key Shortcuts (Failure).

Description

When keyboard shortcuts using only character keys are implemented, voice commands can inadvertently trigger functionality. Character key shortcuts use a single key such as a letter key (including upper- and lower-case letters), punctuation, number, or symbol characters.

Content must either not implement single character key shortcuts, or offer settings to either turn off these shortcuts or to map them to keyboard shortcuts that employ an additional modifier key, such Alt or Ctrl.

The use of a single key keyboard shortcut is not a failure if the shortcut is only active when a particular interface element has focus. For example, when a select element or a custom listbox has focus, the input of single character keys to navigate the list is a useful feature.

The test procedure suggests asking the author (often the developer of the site) whether keyboard shortcuts are used. If that information is trusted then the procedure can be simpler than pressing all the keys.

The success criterion does not apply when single key shortcuts are only active when interface elements have the focus, for example, a select element. Here, pressing a letter key is used for fast navigation within the select options.

Viewing page scripts and searching for typical keyboard event handlers like document.addEventListener('keydown' ...) or the presence of the .keycode attribute may establish the presence of scripts that intercept keyboard shortcuts without modification keys like ALT or Ctrl being held down at the same time. As there are several ways of implementing character key events, this method is not considered reliable.

Some browsers employ single key shortcuts with Shift. For example, Firefox opens a page search when pressing Shift + / and a search in page links when pressing Shift + '. In these cases, it will be necessary to press Esc or click an empty part of the page to remove the focus from the browser input.

Examples

An application uses the single key shortcut S to bring up a search popup. There is no setting available to turn off or modify the shortcut.

Tests