Kilotest: Diagnoses of aria attribute invalid violation by HTML element 260 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 260

• Tag name: BUTTON
• Text: Housing + Cities
• Start tag: <button class="gb-button gb-button-36f00d20 gb-tabs__button" id="gb-tab-button-36f00d20" aria-controls="gb-tab-item-d20f8bd1" aria-selected="false" tabindex="-1">
• XPath: [not obtained]
• Bounding box: x = 1124, y = 1196, width = 172, height = 45

About the aria attribute invalid issue

• Why it matters: Item behavior violates user expectations
• Priority: highest
• Related WCAG standard: 4.1.2

Diagnoses

Here is how tools diagnose the aria attribute invalid issue for HTML element 260 of the Sightline Institute page.

1. The attribute is not allowed for the element on which it is specified

   Tool: Alfa (Siteimprove)

   Rule: r18

2. Elements must only use supported ARIA attributes; ARIA attribute is not allowed: aria-selected="false"

   Tool: Axe (Deque)

   Rule: aria-allowed-attr

3. [failed] The `aria-selected` property is neither inherited nor supported by the `role` button.

   Tool: QualWeb (University of Lisbon)

   Rule: QW-ACT-R25