# Major Issues with Web Standards Compliance Most of the world's largest sites violate HTML and CSS standards. - **Source:** [www.theregister.com - Articles](https://brifing.si/source/2c34ea50-d341-4a10-925d-12c012a9ad10) - **Published:** 2026-08-17 - **Topic:** [Software & Engineering](https://brifing.si/c/engineering) - **Original article:** - **On Brifing:** https://brifing.si/s/a6a494d7-3776-498b-b273-14ddc7111651 ## Web Standards Compliance Issue The ValidateHTML project analyzed the top 5,000 most used websites worldwide. 87.2% of these sites violate HTML standards. Only 12.8% provide fully valid HTML code. This inconsistency hinders the proper rendering of web pages across different browsers and tools. The project highlighted the lack of compliance with HTML5 specifications. ## Accessibility Problems 33% of sites fail accessibility checks, posing a significant legal risk, especially with the upcoming 2025 European Accessibility Act. 20.4% lack alt text on images, and 41.6% miss ARIA labels identifying page regions. These deficiencies make it difficult for screen readers to understand the page structure. ## CSS Errors and Their Impact A total of 18,863 CSS errors were found across the analyzed sites. These errors negatively affect visual consistency and user experience. Non-compliance with CSS standards particularly disrupts proper page display on mobile devices, potentially increasing user bounce rates. ## Role of Frontend Frameworks Frontend frameworks play a significant role in the rise of HTML errors. Over 59% of sites had incorrect tag nesting. These errors often emerge during the build process of frameworks. For example, placing a style element inside a div box is a common mistake in framework-generated code. ## Role of Browsers Browsers' ability to tolerate HTML errors makes developers less meticulous about adhering to standards. Browsers like Chrome silently correct faulty code. However, this creates problems for other technologies like screen readers and AI tools, which lack the same error tolerance as browsers. ## AI and Accessibility AI tools and voice assistants rely on standards to understand web pages. Théo Ducreux states, 'Browsers don't have 20 years of guessing ability.' Therefore, ensuring pages convey consistent meaning across all tools requires writing code that adheres to standards. The way AI reads the web makes compliance even more critical. ## Project Details The ValidateHTML project is led by independent developer Théo Ducreux. It analyzes the top 5,000 websites identified by the Tranco research project. Ducreux uses his own web crawler and open-source parsers. The project operates without any team, funding, or company support. ## The Future of the Web The lack of compliance with web standards poses a significant problem, especially for accessibility. Ducreux notes, 'Invalid HTML often doesn't break anything visible.' However, it creates serious barriers for AI tools and screen readers. The future of the web demands writing code that adheres to standards. ## Sources covering this story - https://www.theregister.com/devops/2026/08/17/almost-nobody-pays-attention-to-web-standards-anymore/5288782 — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._