Kilotest: Diagnoses of attribute value invalid violation by HTML element 1344 on Prometheus page

Here is how tools diagnose the attribute value invalid issue for HTML element 1344 of the Prometheus page.

Basics

• About the attribute value invalid issue
  • Why it matters: Item behaves improperly
  • Priority: highest
  • Related WCAG standard: 1.3.1
• About the Prometheus page
  • URL: https://www.joinprometheus.org/
  • Tested on 2026-04-07 at 19:19
• About HTML element 1344
  • Tag name: A
  • Text: [not applicable]
  • Start tag: <a data-testid="linkElement" href="mailto:info@joinprometheus.org?subject=Prometheus Website Contact" target="_self" class="aeyn4z">
  • XPath: [not obtained]
  • Bounding box: x = 1399, y = 3362, width = 35, height = 35

Diagnoses

1. Bad value mailto:info@joinprometheus.org?subject=Prometheus Website Contact for attribute href on element a: Illegal character in query. Space is not allowed.

   Tool: Html Checker API (World Wide Web Consortium)