Kilotest: Diagnoses of box size absolute violation by HTML element 405 on Mozilla Foundation page

Here is how tools diagnose the box size absolute issue for HTML element 405 of the Mozilla Foundation page.

Basics

• About the box size absolute issue
  • Why it matters: User cannot enlarge the content of an item for readability
  • Priority: high
  • Related WCAG standard: 1.4.4
• About the Mozilla Foundation page
  • URL: https://www.mozilla.org/en-US/
  • Tested on 2026-04-03 at 03:56
• About HTML element 405
  • Tag name: SOURCE
  • Text: [not applicable]
  • Start tag: <source srcset="https://www.mozilla.org/media/img/home/2024/ai-gallery/collective-desktop-344.4bd17baadbf1.jpg 344w,https://www.mozilla.org/media/img/home/2024/ai-gallery/collective-desktop-664.e209725539fb.jpg 664w" sizes="(min-width: 1440px) 337px,calc(25vw - 64px)" width="664" height="664">
  • XPath: /html/body/div[2]/main[1]/section[1]/div[1]/div[1]/div[1]/div[1]/picture[1]/source[2]
  • Bounding box: x = 272, y = 2806, width = 0, height = 0

Diagnoses

1. [failed] The test target `width` attribute uses absolute units.

   Tool: QualWeb (University of Lisbon)

   Rule: QW-BP15