Kilotest: Diagnoses of sizes attribute invalid violation by HTML element 1066 on Center for Democracy and Technology page

Basics

About the page

• URL: https://cdt.org/
• Tested 3 days ago on 2026-10-07 at 19:43 by job 261007T1941-nud
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 11
  • Violations: 1226
  • Violators: 632
  • Issues: 48
• 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: 10
• Violators: 10

About the violator

• Tag name: IMG
• Text: [not applicable]
• Start tag: <img src="https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-500x300.png" alt="" loading="lazy" class="media-figure__source media-figure__source--lazy " srcset="https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-500x300.png 500w, https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-300x180.png 300w, https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-1024x614.png 1024w, https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-768x461.png 768w, https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-1536x922.png 1536w, https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-2048x1229.png 2048w, https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-100x60.png 100w, https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-250x150.png 250w, https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-1000x600.png 1000w, https://cdt.org/wp-content/uploads/2026/07/2026-08-21-tech-prom-concept-social-print-banner-1-resized-1-1500x900.png 1500w" data-sizes-applied="false">
• XPath: [not obtained]
• Bounding box: x = 1251, y = 4690, width = 405, height = 243
• Reported by Html Checker API

Diagnoses

Here is how rule engines diagnose the sizes attribute invalid issue for HTML element 1066 of the Center for Democracy and Technology 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)