Kilotest: Diagnoses of attribute invalid violation by HTML element 221 on Sightline Institute page

Basics

About the Sightline Institute page

• URL: https://www.sightline.org/
• Tested 29 days ago by job wxv on 2026-05-03 at 17:04

About HTML element 221

• Tag name: BUTTON
• Text: All
• Start tag: <button class="gb-button gb-button-97ae4ddd gb-tabs__button gb-block-is-current" id="gb-tab-button-97ae4ddd" aria-controls="gb-tab-item-ef8e240d" aria-selected="true" tabindex="0">
• XPath: [not obtained]
• Bounding box: x = 624, y = 1196, width = 74, height = 45

About the attribute invalid issue

• Why it matters: Item behaves improperly
• Priority: highest
• Related WCAG standard: 1.3.1

Diagnoses

Here is how tools diagnose the attribute invalid issue for HTML element 221 of the Sightline Institute page.

1. The ARIA attributes "aria-selected" are not valid for the element <button> with implicit ARIA role "button"

   Tool: Accessibility Checker (IBM)

   Rule: aria_attribute_valid