Kilotest: Diagnoses of attribute invalid violation by HTML element 363 on Taproot Foundation page

Basics

About the page

• URL: https://taprootfoundation.org/
• Tested 2 days ago on 2026-10-07 at 23:08 by job 261007T2305-4se
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 11
  • Violations: 508
  • Violators: 244
  • Issues: 35
• Download the full technical report (JSON)

About the issue

• Why it matters: Item behaves improperly
• Priority: highest
• Related WCAG standard: 1.3.1
• Reported by 1 rule engine (Html Checker)
• Violations: 66
• Violators: 33

About the violator

• Tag name: BUTTON
• Text: Grantmakers
• Start tag: <button type="button" role="tab" class="section--tab__nav-item" :class="{ 'is-active': active === 3 }" :aria-selected="(active === 3).toString()" @click="active = 3" id="tabs-tab-3" aria-controls="tabs-panel-3" aria-selected="false">
• XPath: /html/body/div[2]/section[6]/div[2]/div[1]/button[4]
• Bounding box: x = 754, y = 2912, width = 133, height = 51
• Reported by Html Checker

Diagnoses

Here is how rule engines diagnose the attribute invalid issue for HTML element 363 of the Taproot Foundation page.

1. Attribute :class not allowed on element button at this point.

   Rule engine: Html Checker (World Wide Web Consortium)

2. Attribute :aria-selected not allowed on element button at this point.

   Rule engine: Html Checker (World Wide Web Consortium)

3. Attribute @click not allowed on element button at this point.

   Rule engine: Html Checker (World Wide Web Consortium)