Kilotest: Diagnoses of attribute value invalid violation by HTML element 779 on Prometheus page

Basics

About the Prometheus page

• URL: https://www.joinprometheus.org/
• Tested 29 days ago by job hzk on 2026-05-03 at 17:00

About HTML element 779

• Tag name: IMG
• Text: [not applicable]
• Start tag: <img loading="lazy" sizes="140px" srcset="https://static.wixstatic.com/media/2100ef_009db3264c424c27b6acb66a73b2dec3~mv2.png/v1/fill/w_140,h_90,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/Final%20Template%20for%20Website%20HomePage-2.png 1x, https://static.wixstatic.com/media/2100ef_009db3264c424c27b6acb66a73b2dec3~mv2.png/v1/fill/w_280,h_180,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/Final%20Template%20for%20Website%20HomePage-2.png 2x" id="img_comp-lh9e65s5" src="https://static.wixstatic.com/media/2100ef_009db3264c424c27b6acb66a73b2dec3~mv2.png/v1/fill/w_140,h_90,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/Final%20Template%20for%20Website%20HomePage-2.png" alt="Final Template for Website HomePage-2.png" style="object-fit:cover" class="BI8PVQ Tj01hh" width="140" height="90">
• XPath: [not obtained]
• Bounding box: x = 1148, y = 1433, width = 140, height = 90

About the attribute value invalid issue

• Why it matters: Item behaves improperly
• Priority: highest
• Related WCAG standard: 1.3.1

Diagnoses

Here is how tools diagnose the attribute value invalid issue for HTML element 779 of the Prometheus page.

1. Bad value for attribute srcset on element img: Expected width descriptor but found 1x at …ePage-2.png 1x,. (When the sizes attribute is present, all image candidate strings must specify a width.)

   Tool: Html Checker API (World Wide Web Consortium)