🔗ally.is.onlyTabbable

Determines if an element is considered tabbable and not focusable.

🔗Description

An element is considered tabbable and not focusable if the element is part of the document's focus navigation sequence, but cannot be focused by script.

Consult the data tables what browsers consider focusable and what ally.js fails to consider focusable to learn how HTML elements behave.

🔗Usage

var element = document.getElementById('victim');
var isOnlyTabbable = ally.is.onlyTabbable(element);

🔗Arguments

Name	Type	Default	Description
element	`HTMLElement`	required	The Element to test.

The underlying rules can also be accessed in the options argument style by calling ally.is.onlyTabbable.rules(options):

Name	Type	Default	Description
context	`<selector>`	required	The element to examine. The first element of a collection is used.
except	`<focus identification exception>`	`{}`	The Element to test.

🔗Returns

Boolean, true if the element is only tabbable.

🔗Throws

TypeError if element argument is not of type HTMLElement.

🔗Changes

Since v#master all <object> elements in Internet Explorer are not considered only tabbable anymore.
Since v#master exceptions can be passed to ally.is.onlyTabbable.rules(options).
Since v#master the state of the <iframe> or <object> element in which the currently examined element is hosted in is considered.
Since v#master elements must be visible to be considered only tabbable.

🔗Notes

See ally.is.focusRelevant

NOTE: there is no way to feature detect if an element is tabbable or not. The Element.tabIndex property gives some indication, but ultimately user agent sniffing (via platform.js) is done internally to fix mismatches.

🔗Related resources

ally.is.focusRelevant is used to identify elements that can receive focus
ally.is.focusable identifies focusable elements
ally.is.tabbable identifies keyboard focusable elements
What Browsers Consider Focusable
What ally.js fails to consider focusable