Kilotest: Diagnoses of attribute invalid violation by HTML element 264 on Tradeoffs page

Basics

About the Tradeoffs page

• URL: https://tradeoffs.org/
• Tested 30 days ago by job 5g2 on 2026-06-20 at 13:59

About HTML element 264

• Tag name: HEADER
• Text: LISTEN READ PROJECTS … Cost of Care Health Equity Health Law Health Technology Insurance Mental Health Public Health Workforce
• Start tag: <header id="masthead" class="site-header hide-header-search" [class]="searchVisible ? 'show-header-search site-header ' : 'hide-header-search site-header'">
• XPath: /html/body/div[1]/header[1]
• Bounding box: x = 0, y = 0, width = 1920, height = 128

Take me there

About the attribute invalid issue

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

Diagnoses

Here is how rule engines diagnose the attribute invalid issue for HTML element 264 of the Tradeoffs page.

1. Attribute [class] not allowed on element header at this point.

   Tool: Html Checker API (World Wide Web Consortium)