Mobile and accessibility
The mobile-first verification pass, why 375px is the width that matters, and the four defects that make a technically correct site feel broken on a phone.
3 min read · updated 2026-07-26· last reviewed 2026-07-26
A large share of this audience reads technical content on a phone, usually in a spare five minutes rather than at a desk. Building on a 27 inch display and checking mobile at the end means every layout decision was made under conditions no visitor experiences.
Build at 375px. Check the desktop afterwards. The reverse order produces a site that is technically responsive and practically unusable.
The rest of "Mobile and accessibility"
681 words covering 2 sections, with the implementation code for 2 checks. The table of contents below is the full outline, so you can see exactly what is behind this.
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What this chapter covers
- Verify small screens first, not last
- The principle
- The four defects
- The implementation
- Keyboard operability
- The principle
- The specific traps
- The implementation
Checks this chapter covers
Each one has a command you can run against your own site.