Kilotest: Diagnoses of attribute value invalid violation by HTML element 770 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 770

• Tag name: IMG
• Text: [not applicable]
• Start tag: <img loading="lazy" sizes="505px" srcset="https://static.wixstatic.com/media/79aa9f_547c6a0e1d9f4adc99b8b5aab304d36e~mv2.png/v1/fill/w_505,h_274,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/79aa9f_547c6a0e1d9f4adc99b8b5aab304d36e~mv2.png 1x, https://static.wixstatic.com/media/79aa9f_547c6a0e1d9f4adc99b8b5aab304d36e~mv2.png/v1/fill/w_738,h_400,al_c,lg_1,q_85,enc_avif,quality_auto/79aa9f_547c6a0e1d9f4adc99b8b5aab304d36e~mv2.png 2x" id="img_comp-lh9e86vt" src="https://static.wixstatic.com/media/79aa9f_547c6a0e1d9f4adc99b8b5aab304d36e~mv2.png/v1/fill/w_505,h_274,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/79aa9f_547c6a0e1d9f4adc99b8b5aab304d36e~mv2.png" alt="" style="object-fit:cover" class="BI8PVQ Tj01hh" width="505" height="274">
• XPath: [not obtained]
• Bounding box: x = 968, y = 1402, width = 505, height = 274

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 770 of the Prometheus page.

1. Bad value for attribute srcset on element img: Expected width descriptor but found 1x at …36e~mv2.png 1x,. (When the sizes attribute is present, all image candidate strings must specify a width.)

   Tool: Html Checker API (World Wide Web Consortium)