Kilotest: Diagnoses of box size absolute violation by HTML element 447 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 447

• Tag name: SOURCE
• Text: [not applicable]
• Start tag: <source srcset="https://www.mozilla.org/media/img/home/2024/ai-gallery/ventures-desktop-688.920b98ded603.jpg 688w,https://www.mozilla.org/media/img/home/2024/ai-gallery/ventures-desktop-1024.59381046c024.jpg 1024w,https://www.mozilla.org/media/img/home/2024/ai-gallery/ventures-desktop-1360.2dcfd80e7b62.jpg 1360w" sizes="(min-width: 1440px) 680px,calc((100vw - 64px) / 2)" width="1360" height="1088">
• XPath: /html/body/div[2]/main[1]/section[1]/div[1]/div[1]/div[4]/div[1]/picture[1]/source[2]
• Bounding box: x = 272, y = 3684, width = 0, height = 0

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

Diagnoses

Here is how tools diagnose the box size absolute issue for HTML element 447 of the Mozilla Foundation page.

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

   Tool: QualWeb (University of Lisbon)

   Rule: QW-BP15