Kilotest: Diagnoses of attribute value invalid violation by HTML element 456 on Centre for Effective Altruism page

Basics

About the Centre for Effective Altruism page

• URL: https://www.effectivealtruism.org/
• Tested 38 days ago by job 6gw on 2026-04-24 at 21:54

About HTML element 456

• Tag name: VIDEO
• Text: [not applicable]
• Start tag: <video width="100%" height="100%" loop="" preload="metadata" src="https://videos.ctfassets.net/ohf186sfn6di/6ZgN8JLY5WtqiKd0XAeYGU/306f0c636a34089ff8e901a963c7291d/lewis_cut.mp4" class="css-1t5je8n-StoryCardImage-previewVideo">
• XPath: [not obtained]
• Bounding box: x = 2100, y = 2111, width = 320, height = 488

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 456 of the Centre for Effective Altruism page.

1. Bad value 100% for attribute width on element video: Expected a digit but saw % instead.

   Tool: Html Checker API (World Wide Web Consortium)

2. Bad value 100% for attribute height on element video: Expected a digit but saw % instead.

   Tool: Html Checker API (World Wide Web Consortium)