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HTTP/2 200 date: Tue, 07 Oct 2025 21:10:22 GMT content-type: text/html; charset=utf-8 content-encoding: gzip content-location: H36.html vary: negotiate,Accept-Encoding,Origin tcn: choice last-modified: Tue, 11 Oct 2016 20:23:50 GMT cache-control: max-age=31536000 expires: Wed, 07 Oct 2026 21:10:22 GMT access-control-allow-origin: * x-backend: www-mirrors x-request-id: 98b06283a8a7b080 strict-transport-security: max-age=15552000; includeSubdomains; preload content-security-policy: frame-ancestors 'self' https://cms.w3.org/ https://cms-dev.w3.org/; upgrade-insecure-requests cf-cache-status: BYPASS set-cookie: __cf_bm=GDpMmK_niBizz5sQoQTIoun4qfm7vUAq_PAhOtCbW1k-1759871422-1.0.1.1-hZizdpl.qYFoa4xVEaAr.uH2KOwhvR4WiCpKZVsixRH138AWQra82qOczMo2a6xS4lMwACWxQkj3uOZ3ep1Fn.iZeG7kZZaUMTAqwzgVc_s; path=/; expires=Tue, 07-Oct-25 21:40:22 GMT; domain=.w3.org; HttpOnly; Secure; SameSite=None server: cloudflare cf-ray: 98b06283a8a7b080-BLR alt-svc: h3=":443"; ma=86400 H36: Using alt attributes on images used as submit buttons | Techniques for WCAG 2.0

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H36: Using `alt` attributes on images used as submit buttons

Important Information about Techniques

See Understanding Techniques for WCAG Success Criteria for important information about the usage of these informative techniques and how they relate to the normative WCAG 2.0 success criteria. The Applicability section explains the scope of the technique, and the presence of techniques for a specific technology does not imply that the technology can be used in all situations to create content that meets WCAG 2.0.

Applicability

Applies to content using image-based submit buttons.

This technique relates to:

Success Criterion 1.1.1 (Non-text Content)
- How to Meet 1.1.1 (Non-text Content)
- Understanding Success Criterion 1.1.1 (Non-text Content)

Description

For input elements of type 'image', the alt attribute of the input element is used to provide a functional label. This label indicates the button's function, but does not attempt to describe the image. The label is especially important if there are multiple submit buttons on the page that each lead to different results.

The input element is used to create many kinds of form controls. Although the HTML and XHTML DTDs permits the alt attribute on all of these, it should be used only on image submit buttons. User agent support for this attribute on other types of form controls is not well defined, and other mechanisms are used to label these controls.

Examples

Example 1

An input element with an alt attribute

Example Code:

<form action="https://example.com/prog/text-read" method="post">
  <input type="image" name="submit" src="button.gif" alt="Submit" />
</form>

Resources

Resources are for information purposes only, no endorsement implied.

G94: Providing short text alternative for non-text content that serves the same purpose and presents the same information as the non-text content

Tests

Procedure

For all input elements that have a type attribute value of "image", check for the presence of an alt attribute.
Check that the alt attribute indicates the button's function.

Expected Results

#1 and #2 are true

If this is a sufficient technique for a success criterion, failing this test procedure does not necessarily mean that the success criterion has not been satisfied in some other way, only that this technique has not been successfully implemented and can not be used to claim conformance.

This Web page is part of Techniques and Failures for Web Content Accessibility Guidelines 2.0 (see the latest version of this document). The entire document is also available as a single HTML file. See the The WCAG 2.0 Documents for an explanation of how this document fits in with other Web Content Accessibility Guidelines (WCAG) 2.0 documents. To send public comments, please follow the Instructions for Commenting on WCAG 2.0 Documents.

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H36: Using alt attributes on images used as submit buttons