Kilotest: Diagnoses of attribute invalid violation by HTML element 219 on Sightline Institute page

Here is how tools diagnose the attribute invalid issue for HTML element 219 of the Sightline Institute page.

Basics

• About the attribute invalid issue
  • Why it matters: Item behaves improperly
  • Priority: highest
  • Related WCAG standard: 1.3.1
• About the Sightline Institute page
  • URL: https://www.sightline.org/
  • Tested on 2026-04-03 at 04:04
• About HTML element 219
  • 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

Diagnoses

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