Quick Summary
- 15-20% of customers are neurodivergent and face cognitive barriers that cause cart abandonment.
- Remove auto-play, simplify forms, and use clear language to reduce drop-offs by up to 35%.
- WCAG 2.2 Level AA (required by European Accessibility Act (EAA) since June 2025) includes cognitive accessibility criteria.
- Cognitive accessibility improves conversions for everyone, not just neurodivergent users.
E-commerce sites can make or break someone's purchase decision based on how easy they are to use. Checkout flows allow your customers to complete transactions, but only when designed to work for everyone.
The problem? According to Baymard Institute's research, approximately 70% of online shoppers abandon their carts, costing e-commerce businesses an estimated €18 billion annually. Many of these abandonments are directly caused by cognitive load—the mental effort required to complete a purchase.
Problems arise when designers and developers do not create e-commerce experiences that work for people with ADHD, autism, or dyslexia. Issues occur when someone can't process multiple competing stimuli, receives vague error messages, encounters unpredictable interfaces, or struggles with dense text. These cognitive barriers remain common and can make checkout impossible to complete for approximately 15-20% of your potential customers.
Why Cognitive Barriers Trigger EAA Complaints
EAA enforcement is complaint-driven and task-based. Regulators don't audit every WCAG criterion but they respond when users cannot complete essential tasks like:
- Making a purchase
- Completing checkout
- Creating an account
- Navigating product pages
Real enforcement is already happening: In the Netherlands, the ACM (Authority for Consumers & Markets) can impose fines for accessibility violations. WCAG 2.2 Level AA—required by the European Accessibility Act since June 28, 2025—includes multiple success criteria that directly address cognitive accessibility.
Our job is to remove cognitive barriers from e-commerce experiences to ensure that anyone can complete a purchase regardless of how their brain processes information. The more direct and intentional we are with designing for cognitive accessibility, the less likely someone will abandon their cart or be unable to achieve their goal.
Understand Your Neurodivergent Customers
Before you do anything else, you need to understand who you're designing for and what barriers they face. Approximately 15-20% of the global population is neurodivergent, which translates to 2.6-3.5 million potential customers in the Netherlands alone.
Research shows that ADHD affects 3-4% of UK adults, with even higher rates among younger demographics who make up a key e-commerce audience. The World Health Organization estimates approximately 1 in 100 children worldwide have autism spectrum disorder. The International Dyslexia Association reports approximately 10% of the population has dyslexia.
These aren't edge cases. These are substantial segments of your customer base who face specific cognitive barriers that prevent task completion. Understanding their needs is the first step to removing those barriers.
This step is often overlooked because many designers assume everyone processes information the same way. This approach often backfires and leads to cart abandonment since cognitive barriers make checkout too difficult for neurodivergent users.
Remove Auto-Playing Content and Distractions
Our checkout flows need to work for people with ADHD, not overwhelm them. Before a designer creates the interface, it should be built with attention management in mind. This means that sites minimize competing stimuli, avoid auto-playing content, and focus on one primary action per page.
This aligns with multiple WCAG 2.2 Level AA success criteria required by the EAA:
- (wcag: 2.2.2 label: Pause, Stop, Hide): Users can pause, stop, or hide content that auto-plays for more than 5 seconds
- (wcag: 2.2.1 label: Timing Adjustable): Users can extend or turn off time limits unless essential
Research published in Psychiatry Research (2018) found that individuals with ADHD experience significantly more severe sensory sensitivities, sensory avoidance, and sensory seeking compared to neurotypical controls. Auto-playing videos, pop-up chat widgets, promotional banners, and moving carousels all compete for attention simultaneously and create genuine sensory overload.
Proper implementation looks like this:
<!-- CORRECT: User controls video -->
<video controls preload="metadata">
<source src="product-demo.mp4" type="video/mp4">
</video>
<!-- INCORRECT: Auto-plays -->
<video autoplay loop muted>
<source src="background-video.mp4" type="video/mp4">
</video>
Make it easier for everyone to maintain focus by removing distractions and ensuring content doesn't move, flash, or play unless the user initiates it.
According to cognitive load theory, working memory is limited to processing approximately 7±2 information units at once. Every pop-up, banner, and auto-playing element consumes that limited capacity and makes checkout harder to complete.
Simplify Choices to Prevent Decision Paralysis
Product pages and checkout flows should not overwhelm users with excessive options. This addresses cognitive load for users with ADHD who struggle with decision paralysis when presented with too many choices.
Classic research by Iyengar & Lepper (2000) demonstrated that consumers exposed to limited choices (6 options) were 10 times more likely to purchase than those exposed to extensive choices (24 options). This isn't just about ADHD—it affects everyone.
How to reduce choice overload:
- Limit product variants displayed at once (show 6-8 maximum)
- Reduce shipping options to 2-3 clear choices
- Provide a recommended or default option
- Group related options together logically
- Use progressive disclosure for additional options
Never display 47 color variants, 12 shipping methods, and 5 promotional offers simultaneously. Users with ADHD will abandon the cart due to decision paralysis, not lack of interest in purchasing.
Maintain Consistent, Predictable Navigation
Nothing is more frustrating than navigating a site where buttons move, menus rearrange, or interfaces behave unpredictably. (wcag: 3.2.3 label: Consistent Navigation) requires that navigation mechanisms appear in the same relative order across pages.
Additionally, (wcag: 3.2.4 label: Consistent Identification) states that components with the same functionality must be identified consistently throughout the site.
Research shows that autistic adults prefer online shopping to avoid social interaction stress, but encounter significant barriers with unpredictable interfaces and unclear instructions. Predictability is essential for autistic users who rely on consistent patterns.
Consistent navigation means:
- Header navigation appears in same position on every page
- Primary actions (Add to Cart, Checkout) use same label and style throughout
- Search functionality always in same location
- Icons have consistent meanings
The Bottom Line
E-commerce sites frequently have cognitive accessibility issues that prevent 15-20% of potential customers from completing purchases. This often leads to cart abandonment, frustration, or both. With 70% of shoppers abandoning carts and €18 billion in annual lost revenue, cognitive barriers aren't just accessibility issues—they're directly costing you money.
WCAG 2.2 Level AA—required by the European Accessibility Act since June 28, 2025—includes multiple success criteria addressing cognitive accessibility. Compliance isn't optional. The Dutch ACM can impose fines, and enforcement is actively happening across Europe.
For a more inclusive web and better business outcomes, all of us should strive to make sure our e-commerce experiences work for neurodivergent users. This isn't just about compliance—it's about not excluding millions of potential customers from doing business with you. Research shows companies investing in accessibility see average ROI improvements of 35% through increased market reach and reduced support costs.