Who It Affects — Everyone, eventually

Situational and Temporary Barriers

A broken arm, bright sunlight, a noisy train, a bad connection, a borrowed laptop. The accommodation is identical to the permanent one.

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What It's Like

The business case is not empathy. It's that these are the same fixes, and everyone hits them.

Someone holding a baby is a one-handed user. Someone on a train with no headphones needs captions. Someone outdoors at noon needs contrast. Someone on hotel wifi needs your site to work when the fonts and the hero video do not load. Someone who just had eye surgery needs 300% zoom for two weeks. None of them identify as disabled, none will file a complaint, and all of them are served by exactly the same work.

Scale: Situational and temporary limitations affect the entire user base at some point — which is why accessibility improvements reliably show up in conversion and support metrics rather than only in compliance reports. (Source: Universal design research. Survey-based disability figures undercount — treat this as a floor.)

What they're using

Whatever the user already has, used in worse conditions
Captions watched with the sound off in public
Keyboard navigation because the trackpad is unusable on a train
Zoom because the screen is small and the sun is bright

What Breaks

5 barriers we find most often, and the criteria behind them.

Contrast that only works indoors

Light gray text is legible on a designer's monitor and invisible on a phone in sunlight.

Success criteria: 1.4.3 Contrast (Minimum) AA · 1.4.11 Non-text Contrast AA

Sound-dependent content

Video without captions is unusable in any public place, which is where most mobile viewing happens.

Success criteria: 1.2.2 Captions (Prerecorded) A

Interfaces that require two hands or fine motor control

Drag interactions, multipoint gestures, and small targets fail for anyone holding something, standing on a moving train, or using a device one-handed.

Success criteria: 2.5.1 Pointer Gestures A · 2.5.7 Dragging Movements AA · 2.5.8 Target Size (Minimum) AA

Pages that break when something does not load

Icon fonts, hero video, and script-dependent content on a slow or filtered connection leave a page that renders but cannot be used.

Success criteria: 1.1.1 Non-text Content A · 1.3.1 Info and Relationships A

Timeouts that assume ideal conditions

A session limit calibrated for an undistracted user at a desk fails anyone who got interrupted.

Success criteria: 2.2.1 Timing Adjustable A

What Fixes It

The changes that actually remove the barrier.

Treat the permanent case as the design target

Build for the screen reader user and the one-handed user, and the situational cases resolve themselves.

Degrade gracefully

Real text instead of icon fonts, server-rendered content where it matters, and a page that still works when the third-party script fails.

Caption by default

The majority of social video is watched muted. Captions are a distribution decision as much as an accessibility one.

Measure the payoff

Form completion, support ticket volume, and mobile conversion are where this work shows up. Instrument them before you start so you can prove it afterward.

Check It Yourself

Three tests you can run before you call anyone.

Use your own site outdoors on a phone at midday.
Complete a purchase one-handed while standing.
Throttle the connection to slow 3G and block third-party scripts, then try the main task.

If any of those go badly, you have your answer and you did not need a vendor to get it. What a vendor is for is the part after: knowing which of the 55 criteria that maps to, how deep it goes, and what it costs to fix properly rather than patch.

Run the Free Checker

Where this shows up in practice

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