Kilotest: Diagnoses of sizes attribute invalid violation by HTML element 413 on Charity Navigator page

Basics

About the page

• URL: https://www.charitynavigator.org/
• Tested 3 days ago on 2026-10-07 at 19:56 by job 261007T1941-rxh
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 11
  • Violations: 720
  • Violators: 293
  • 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: 5
• Violators: 5

About the violator

• Tag name: IMG
• Text: [not applicable]
• Start tag: <img decoding="async" class="e-image-base e-default-img e-5702f9c1-18a0e7e" data-interaction-id="5702f9c1" data-e-type="widget" data-id="5702f9c1" id="11818" src="https://www.charitynavigator.org/uploads/2026/09/group-of-people-volunteering-outdoors-on-a-beach-2026-09-23-12-42-36-utc.jpg" width="800" height="534" srcset="https://www.charitynavigator.org/uploads/2026/09/group-of-people-volunteering-outdoors-on-a-beach-2026-09-23-12-42-36-utc.jpg 800w, https://www.charitynavigator.org/uploads/2026/09/group-of-people-volunteering-outdoors-on-a-beach-2026-09-23-12-42-36-utc-300x200.jpg 300w, https://www.charitynavigator.org/uploads/2026/09/group-of-people-volunteering-outdoors-on-a-beach-2026-09-23-12-42-36-utc-768x513.jpg 768w" alt="Group of eco volunteers picking up plastic trash on the beach">
• XPath: /html/body/main[1]/div[1]/div[1]/div[1]/div[1]/div[1]/div[2]/div[2]/img[1]
• Bounding box: x = 950, y = 160, width = 620, height = 520
• Reported by Html Checker API

Diagnoses

Here is how rule engines diagnose the sizes attribute invalid issue for HTML element 413 of the Charity Navigator 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)