Cart abandonment is a major and costly challenge for ecommerce retailers. Over 70% of online shopping carts are abandoned before purchase, resulting in billions of dollars lost each year. While teams often focus on pricing, shipping, and checkout complexity, an overlooked issue is checkout inaccessibility.
Inaccessible forms, unclear error messages, broken keyboard navigation, and poor screen reader compatibility push shoppers away at the point of purchase. Improving the accessibility of ecommerce checkouts can reduce cart abandonment. It satisfies legal requirements and creates smoother, faster, and more intuitive checkout experiences for every customer.This article shares insights from UsableNet’s accessibility experts—drawn from our audit program and webinar series—to show practical ways to reduce shopping cart abandonment by fixing checkout barriers.
A key concept in accessible ecommerce design is the “curb cut effect.” Curb cuts, made to help wheelchair users, also aid people with strollers, delivery workers, cyclists, and anyone with their hands full. A fix for one group benefits many—and this applies to your checkout.
Form labels help screen reader users and make fields clearer for first-time shoppers. Keyboard navigation helps users with motor impairments and those who prefer keyboards. Error messages in text—not just color—help colorblind users and anyone distracted, tired, or using a small screen. Every accessibility improvement is a conversion optimization.
Over 1 billion people worldwide have disabilities, and many more face temporary or situational barriers. Checkout friction that affects a small group often harms many, including mobile users, those in low-bandwidth areas, and anyone checking out under time pressure.
Based on internal audit data, the five most common checkout accessibility issues that drive cart abandonment are:
These issues are especially costly because several, particularly missing accessible names and contrast problems, can be found by automated scans. Plaintiff attorneys can discover them before your team does.
WCAG 2.2, the standard since October 2023, adds several new criteria relevant to ecommerce checkout. WCAG 2.2 addresses how modern checkout designs can create barriers for specific users.
3.3.7 Redundant Entry — The Billing Address Problem
WCAG 2.2’s Redundant Entry rule (Level A) says users should not need to re-enter information during a session unless it’s required for security or other key reasons. In ecommerce, this usually applies to the billing address. If the shipping and billing addresses are the same, forcing users to retype them adds unnecessary effort.
The solution, highlighted in UsableNet’s WCAG 2.2 training, is a checkbox: “Billing address is the same as shipping address.” When checked, the billing fields are automatically filled. This approach is accessible and directly boosts conversions. Forcing users to recall and re-enter information increases errors and abandonment, especially for those with cognitive or motor impairments.
3.3.8 Accessible Authentication — Login Barriers at Checkout
For ecommerce sites that require account login before checkout, or that offer “Save my details” functionality, WCAG 2.2’s Accessible Authentication criterion (Level AA) is one of the most technically complex new requirements. It prohibits checkout flows from relying solely on cognitive function tests—such as remembering a password or solving a CAPTCHA—without providing accessible alternatives.
Practical solutions include: supporting password managers and autofill, offering magic link authentication via email, enabling biometric login (fingerprint or face recognition), and allowing sign-in via Google or Apple accounts. For users with cognitive impairments, the ability to copy and paste a verification code—rather than manually transcribe it from another device—is often the difference between completing a checkout and abandoning it.
UsableNet’s audit team consistently identifies accessible authentication as the most technically complex WCAG 2.2 criterion for ecommerce, since compliance often requires back-end changes that go well beyond the design or front-end layer.
2.5.8 Target Size Minimum — Small Buttons, Big Abandonment
WCAG 2.2 now requires that buttons, links, and other interactives have a minimum size (24×24 CSS pixels) and spacing to prevent mistaken taps. In checkout flows, this applies to payment method selectors, quantity steppers, and “Place Order” buttons. Small targets lead to failed interactions, retries, and increased abandonment, especially for those with motor issues or using small screens.
2.4.11 Focus Not Obscured — Sticky Elements Hiding the Checkout
Many ecommerce sites use sticky headers, order summary bars, or persistent chat widgets during checkout. WCAG 2.2’s Focus Not Obscured rule (Level AA) requires keyboard focus to stay visible—not hidden behind fixed elements. Users who can’t see the active field lose their place and may abandon the form. Scroll-padding in CSS keeps focused fields in view.
Meeting WCAG requirements is important, but the design of checkout forms directly affects completion rates. UsableNet’s design team has identified several principles that reduce accessibility issues and abandonment at once:
Labels, not placeholders
Placeholder text disappears when users start typing, making it hard to remember what the field requires. Every input should have a persistent, programmatically associated label. This helps screen reader users, autofill, and anyone interrupted while filling out forms.
Forgiving, asynchronous validation
Form interactions should assist users in filling out fields correctly and be forgiving enough to anticipate common mistakes, such as entering spaces in a credit card number field or formatting a phone number differently than expected. Asynchronous validation that checks inputs as they are completed, rather than only on form submission, provides more immediate feedback and dramatically reduces the frustration of submitting a form only to discover multiple errors at once.
Accessible error messages
When checkout validation fails, the error message is the last opportunity to recover the sale. Error messages must identify the specific field, describe the problem in plain language, and be announced via ARIA live regions so screen reader users hear them without needing to navigate back to the top of the form. Replacing generic messages like “Please check your information” with specific ones like “Card number must be 16 digits” measurably reduces re-submission errors and dropout.
Accessible cart updates and feedback
When users add items to their cart, apply a discount code, or see shipping costs update dynamically, these changes must be announced to screen reader users, not just rendered visually. ARIA live regions ensure that users who cannot see the update are still informed. Without this, a blind or low-vision user may proceed to payment unaware of a price change, only to abandon when they reach a final total they did not expect.
Checkout accessibility issues that are not uniform across platforms. The barriers that most commonly cause cart abandonment vary depending on a retailer's level of control over their checkout environment.
On Shopify, the core checkout is managed by Shopify and is generally well-maintained against baseline WCAG standards. However, theme customizations, third-party apps, and, on Shopify Plus, checkout extensibility features introduce the majority of accessibility regressions. The sticky cart drawer pattern common in Shopify themes is a frequent source of WCAG 2.4.11 focus-obscuring failures.
Magento and Adobe Commerce give merchants full checkout control—which means full responsibility for remediation. Custom checkout builds frequently introduce focus management failures, missing ARIA attributes, and inaccessible modal dialogs during platform or module updates. BigCommerce provides a baseline-accessible checkout but requires careful auditing of all theme customizations and app integrations.
Headless and composable commerce architectures often present risk if accessibility is not built in from the start. Custom JavaScript components built from scratch frequently miss focus trapping, live region announcements, and keyboard interaction patterns. For headless builds, accessibility should be designed in at the component level—not retrofitted after launch.
Yes—significantly. Embedded payment widgets from Stripe, PayPal, Braintree, Apple Pay, and similar providers introduce their own accessibility layers that retailers cannot control directly through their codebase. These iframes should be explicitly tested with screen readers and keyboard-only navigation in every major browser.
Common gateway failures include iframes without accessible titles, payment confirmation dialogs that trap or lose keyboard focus, and 3D Secure authentication flows that rely on inaccessible CAPTCHA challenges without alternatives. If a payment iframe blocks keyboard navigation or fails to announce validation errors to screen reader users, the customer cannot complete the transaction—regardless of how accessible the rest of the checkout is.
If an embedded payment widget cannot be remediated, consider whether a redirect-based integration (where the user is taken to the gateway’s own page) better supports assistive technology compatibility. Work with your payment provider to understand their WCAG conformance posture and request accessible authentication alternatives.
Peak seasons—Black Friday, Cyber Monday, holiday shopping—amplify every checkout barrier. Traffic surges stress-test JavaScript-dependent validation, slow dynamic cart updates, and stretch session timeouts. Users who already face accessibility barriers have even lower tolerance for friction when faster alternatives are widely available.
UsableNet recommends a pre-season accessibility audit of your checkout flow four to six weeks before any major peak period. This gives development teams enough time to remediate critical failures before traffic spikes. The audit should combine automated scanning with AQA to surface code-level issues and manual testing with real assistive technologies to catch interaction failures that automation cannot detect.
For high-traffic resilience specifically, progressive enhancement—ensuring checkout functions even when JavaScript is slow to load—is both an accessibility strategy and a performance strategy. Accessible timeout warnings (using ARIA alerts), session extension options, and clear “Something went wrong” states that describe the problem and offer a path forward all reduce abandonment across your entire customer base during peak periods.
Cart abandonment recovery—email reminders, SMS nudges, retargeting—is most effective when the experience the customer returns to is itself accessible. An abandoned cart email that links back to a checkout with broken keyboard navigation or an inaccessible payment widget will fail to convert the user it was designed to recover.
Best practices for accessible cart recovery include preserving cart state so returning users do not need to re-enter information already provided (directly supporting WCAG 3.3.7 Redundant Entry), ensuring recovery email templates meet basic accessibility standards—semantic markup, sufficient contrast, meaningful link text, and responsive layout—and confirming that SMS links resolve to an accessible mobile checkout experience.
AI-powered chat and support tools integrated into the checkout flow can also reduce initial abandonment by guiding users through complex form requirements, answering questions about shipping or payment options, and proactively surfacing help when users appear stuck. Critically, these chat interfaces must themselves meet WCAG keyboard and screen reader requirements—the customers most likely to need in-checkout support are often those who also rely on assistive technology.
UsableNet has more than two decades of experience helping ecommerce brands—across retail, travel, financial services, and beyond—identify and fix the checkout accessibility issues that silently cost conversions. Our programs combine automated testing, expert manual audits with real assistive technologies, and developer training to build checkout flows that are accessible, resilient, and conversion-ready.
The following questions come directly from ecommerce teams engaging with UsableNet on checkout accessibility and cart abandonment.
What are the most common checkout accessibility issues found on ecommerce sites?
Based on UsableNet’s Q3 audit data across ecommerce, airlines, financial services, and other industries, the five most frequently cited failures are: missing accessible names on UI components (WCAG 4.1.2), non-descriptive link and button text (WCAG 2.4.4), images without alt text (WCAG 1.1.1), incorrect heading structure (WCAG 1.3.1 and 2.4.6), and insufficient color contrast (WCAG 1.4.3). For checkout flows specifically, missing form labels, inaccessible error messages, and broken keyboard navigation in payment dialogs are the most direct causes of abandonment.
Do third-party payment gateways affect checkout accessibility?
Yes. Embedded payment widgets from providers like Stripe, PayPal, and Braintree introduce their own accessibility layers outside your direct control. These iframes must be tested explicitly with screen readers and keyboard navigation. Common failures include iframes without accessible titles, payment dialogs that trap keyboard focus, and 3D Secure authentication steps with an inaccessible CAPTCHA. If the gateway iframe cannot be remediated, a redirect-based integration may better support assistive technology users.
Is checkout accessibility different on Shopify, Magento, or BigCommerce?Yes. On Shopify, the core checkout is Shopify-managed and generally accessible at a baseline level, but theme customizations and third-party apps are the primary sources of regressions. Shopify Plus merchants can modify the checkout directly using checkout extensibility features, which requires its own accessibility review. Magento and Adobe Commerce give teams full checkout control and full remediation responsibility—module updates frequently introduce accessibility failures. BigCommerce provides a baseline-accessible checkout, but it requires auditing all customizations. Headless builds on any platform carry the highest risk and require accessibility to be built in from the component level. UsableNet offers platform-specific guidance for each of these environments.
The most effective ways to reduce shopping cart abandonment are not always the most visible. Price testing and checkout flow simplification draw attention. Checkout accessibility barriers, do not—until an audit, a lawsuit, or a sustained conversion drop forces the conversation. But the two are inseparable: every barrier that blocks a user with a disability is also friction that slows down everyone else.
Retailers who invest in accessible checkout design—fixing form labels, improving error handling, ensuring keyboard operability, and auditing third-party components—build checkout experiences that convert more broadly, hold up under peak-season load, and recover better through cart abandonment campaigns. The curb cut effect applies here as fully as anywhere: design for those who need it most, and you build something better for everyone.
Whether you’re on Shopify, Magento, BigCommerce, or a custom headless stack, UsableNet’s ecommerce accessibility services can help you identify the checkout barriers costing you conversions—and fix them before they cost you another peak season.
Ready to find and fix the checkout accessibility issues that are reducing your conversion rate? Schedule a free consultation with UsableNet →