valid-tabindex.md

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doc-api.html	argument-list

ally.is.validTabindex

Determines if an element's tabindex attribute value is sound

Description

Usage

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

Arguments

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

Returns

Boolean, true if the element is has a valid tabindex attribute specified.

Throws

TypeError if element argument is not of type HTMLElement.

Examples

Changes

• Since v1.4.0 supports tabIndex as attribute name for SVG elements in Microsoft Edge.

Notes

::note Empty tabindex [tabindex=""] parsed and exposed as [tabindex="-32768"] - Trident 1072965. :::

:::note Invalid tabindex value makes element focusable in - 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).

Related resources

• HTML5: The tabindex attribute

Contributing

• module source
• document source
• unit test