Kilotest: Diagnoses of sizes attribute invalid violation by HTML element 1259 on Future Cleantech Architects (FCA) page

Basics

About the page

• URL: https://fcarchitects.org/
• Tested 3 days ago on 2026-10-07 at 21:35 by job 261007T2113-sx8
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 12
  • Violations: 736
  • Violators: 428
  • Issues: 47
• Download the full technical report (JSON)

About the issue

• Why it matters: Item behaves improperly
• Priority: highest
• Related WCAG standard: 1.3.1
• Reported by 1 rule engine (Html Checker API)
• Violations: 4
• Violators: 4

About the violator

• Tag name: IMG
• Text: Subscribe to our Newsletter
• Start tag: <img decoding="async" srcset="https://fcarchitects.org/wp-content/uploads/2020/06/nasa-Q1p7bh3SHj8-unsplash-300x200.jpg 300w, https://fcarchitects.org/wp-content/uploads/2020/06/nasa-Q1p7bh3SHj8-unsplash-1024x681.jpg 1024w, https://fcarchitects.org/wp-content/uploads/2020/06/nasa-Q1p7bh3SHj8-unsplash-768x511.jpg 768w, https://fcarchitects.org/wp-content/uploads/2020/06/nasa-Q1p7bh3SHj8-unsplash-1536x1022.jpg 1536w, https://fcarchitects.org/wp-content/uploads/2020/06/nasa-Q1p7bh3SHj8-unsplash-2048x1363.jpg 2048w" src="https://fcarchitects.org/wp-content/uploads/2020/06/nasa-Q1p7bh3SHj8-unsplash-scaled.jpg" class="card-img pix-bg-image h-100 pix-img-scale pix-opacity-10 rounded-lg " alt="Subscribe to our Newsletter">
• XPath: [not obtained]
• Bounding box: x = 1312, y = 5773, width = 208, height = 210
• Reported by Html Checker API

Diagnoses

Here is how rule engines diagnose the sizes attribute invalid issue for HTML element 1259 of the Future Cleantech Architects (FCA) page.

1. When the srcset attribute has any image candidate string with a width descriptor, the sizes attribute must also be specified.

   Rule engine: Html Checker API (World Wide Web Consortium)