🔗ally.is.validTabindex

Determines if an element's tabindex attribute value is sound

🔗Usage

var element = document.getElementById('victim');
var isValidTabindex = ally.is.validTabindex(element);

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

Boolean, true if the element is focus relevant.

TypeError if element argument is not of type HTMLElement.

NOTE: empty tabindex [tabindex=""] parsed and exposed as [tabindex="-32768"] - Trident 1072965

WARNING: invalid tabindex value makes element focusable - Gecko 1128054

WARNING: Gecko, Blink and WebKit consider [tabindex="3x"] valid

WARNING: only Blink and WebKit respect the tabindex attribute on SVGElements (defined in SVG 2)