aria-required

The aria-required attribute indicates that user input is required on the element before a form may be submitted.

When a semantic HTML <input>, <select>, or <textarea> must have a value, it should have the required attribute applied to it. The HTML required attribute disables submitting the form unless the required form controls have valid values, while ensuring those navigating with the aid of assistive technologies understand which semantic form controls need valid content.

When form controls are created using non-semantic elements, such as a <div> with a role of checkbox, the aria-required attribute should be included, with a value of true, to indicate to assistive technologies that user input is required on the element for the form to be submittable. The aria-required attribute can be used with HTML form elements; it is not limited to elements that have an ARIA role assigned.

Similar to the HTML required attribute set on semantic HTML form controls, the aria-required attribute explicitly conveys to assistive technologies that the element is required before a form may be submitted. The required attribute on a semantic HTML form control will prevent the form control from being submitted if no value is present — providing native error messaging in some browsers if a required value is invalid when the user attempts to submit the form. The aria-required attribute, like all ARIA states and properties, has no impact on element functionality. Functionality and behavior must be added in with JavaScript.

The CSS :required and :optional pseudoclasses match <input>, <select>, and <textarea> elements based on whether they are required or optional, respectively. When using non-semantic elements as form controls, you don't get this CSS pseudoclass selector benefit. You can, however, use attribute selectors if the attribute is present: [aria-required="true"] or [aria-required="false"].

If a form contains both required and optional form elements, the required elements should be indicated visually using a treatment that does not rely solely on color to convey meaning. Typically, descriptive text and/or an icon are used.

The attribute should be added to the form-control role. If the user needs to fill in an email address textbox, include aria-required="true" on the textbox.

<div id="tbLabel">Email Address (required)</>
<div role="textbox" contenteditable aria-labelledby="tblabel" aria-required="true" id="email1"></div>

In this example, JavaScript must be used to prevent the containing form from being submitted if the textbox has no content.

This could be written semantically, without the need for JavaScript:

<label for="email1">Email Address (required)</label>
<input type="email" id="email1" required />

true

The element requires a value or must be checked for the form to be submittable.

false

The element is not required.

Element.ariaRequired

The ariaRequired property, part of the Element interface, reflects the value of the aria-required attribute.

ElementInternals.ariaRequired

The ariaRequired property, part of the ElementInternals interface, reflects the value of the aria-required attribute.

Used in roles:

• checkbox
• combobox
• gridcell
• listbox
• radiogroup
• spinbutton
• textbox
• tree

Inherits into roles:

• columnheader
• rowheader
• searchbox
• switch
• treegrid

• HTML required attribute
• :optional pseudoclass
• :required pseudoclass
• aria-invalid attribute
• MDN Understanding WCAG, Guideline 3.3 explanations
• Understanding Success Criterion 3.3.2 | W3C Understanding WCAG 2.0