Kilotest: Diagnoses of attribute missing violation by HTML element 258 on Sightline Institute page

Here is how tools diagnose the attribute missing issue for HTML element 258 of the Sightline Institute page.

Basics

• About the attribute missing issue
  • Why it matters: Item behaves improperly
  • Priority: highest
  • Related WCAG standard: 4.1.2
• About the Sightline Institute page
  • URL: https://www.sightline.org/
  • Tested on 2026-04-03 at 04:04
• About HTML element 258
  • 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

Diagnoses

1. Element button is missing one or more of the following attributes: aria-checked, role, type.

   Tool: Html Checker API (World Wide Web Consortium)