Kilotest: Diagnoses of code invalid violation by HTML element 626 on Mozilla Foundation page

Basics

About the Mozilla Foundation page

• URL: https://www.mozilla.org/en-US/
• Tested 38 days ago by job tyn on 2026-04-24 at 19:48

About HTML element 626

• Tag name: HEADER
• Text: Get Firefox news
• Start tag: <header class="mzp-c-newsletter-header">
• XPath: /html/body/div[2]/footer[1]/div[1]/div[1]/div[2]/form[1]/header[1]
• Bounding box: x = 0, y = 0, width = 0, height = 0

Take me there

About the code invalid issue

• Why it matters: Invalid code in the document may prevent a helper from working
• Priority: high
• Related WCAG standard: 4.1

Diagnoses

Here is how tools diagnose the code invalid issue for HTML element 626 of the Mozilla Foundation page.

1. The element header must not appear as a descendant of the footer element.

   Tool: Html Checker API (World Wide Web Consortium)