Web accessibility: Definition, issues and explanations

Web accessibility refers to the set of techniques and principles that enable all people, including those with disabilities, to access and use a website or online application. It aims to eliminate obstacles that might prevent certain people from browsing, reading or interacting with web content.

These functions concern different types of disability, whether visual, auditory, motor or cognitive. Accessibility is based on international standards, notably the WCAG (Web Content Accessibility Guidelines), which provide technical and ergonomic recommendations for making web content accessible.

In short, web accessibility ensures that digital content is inclusive and usable by all, whatever their situation or abilities.

Web accessibility is essential to fostering digital inclusion. It enables people with disabilities to access online content and services, which is a fundamental right and a legal requirement in many countries.

Beyond its ethical aspect, accessibility also improves the user experience for all, especially for the elderly, users with slow internet connections or varied devices.

In addition, making a site accessible can extend the reach of a service, increase its credibility and improve its natural search engine optimization (SEO), as search engines value well-structured and accessible sites.

Web accessibility is implemented via technical and ergonomic best practices integrated right from the design stage and throughout the development of a site or application.

Concretely, this includes in particular the use of alternative text for images, full keyboard navigation, clear semantic structure thanks to appropriate HTML tags, and sufficient contrasts between text and background.

Sites are often tested with specific tools and disabled users to ensure compliance with standards such as WCAG, ensuring a fluid, accessible experience for all.

Benefits:

• Digital inclusion: enables a wider audience, including people with disabilities, to access content.
• Improved overall user experience, beneficial for all.
• Legal compliance: in many countries, this is a regulatory requirement.
• Better natural referencing thanks to clear, well-structured code.
• Positive image of the brand or company, committed to social responsibility.

Disadvantages:

• Cost and extra time to integrate good accessibility practices.
• May require specific training for developers and designers.
• Increased technical complexity for certain interactive or multimedia elements.
• Compliance checks can be long and complex.

An e-commerce site that offers alternative descriptions for all images so that visually impaired users can understand products via a screen reader.

A mobile app with fully keyboard-accessible navigation and buttons large enough for people with motor difficulties.

An information site that uses subtitled videos and text transcriptions for audio content, facilitating access for deaf or hard-of-hearing people.

• W3C WCAG - Web Content Accessibility Guidelines
• MDN Web Docs - Accessibility
• WAVE - Accessibility Evaluation Tool
• WebAIM - Accessibility Resources and Tools
• Paciello Group - Accessibility Tools