Kilotest: Diagnoses of meta invalid violation by HTML element 26 on Prometheus page

Here is how tools diagnose the meta invalid issue for HTML element 26 of the Prometheus page.

Basics

• About the meta invalid issue
  • Why it matters: Document fails to include needed data
  • Priority: high
  • 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 26
  • Tag name: META
  • Text: [not applicable]
  • Start tag: <meta http-equiv="x-dns-prefetch-control" content="on">
  • XPath: /html/head[1]/meta[8]
  • Bounding box: x = 0, y = 0, width = 0, height = 0

Diagnoses

1. Bad value x-dns-prefetch-control for attribute http-equiv on element meta.

   Tool: Html Checker API (World Wide Web Consortium)