CHK-014Checkout · formsHigh

Inline validation on blur, not only on submit

Inline validation on blur (not on keystroke, not only on submit).

Check my store for this rule →Cite this

Free · no card · runs all rules at once · judged on 38 stores · updated 23 Sep 2026

3%of the audited stores we could judge fail this rule

37 pass0 partial1 failPublished audits · September 2026

Stores judged

of 40 published audits

Score weight

1.5pts

of the 100-point score

Page share

50%

of the score is the checkout

What earns each verdict

Same outcomes on every UXFix rule · how verdicts work

✓ Pass37

Error appears on blur.

~ Partial0

Real-time on-keystroke validation (annoying, but not the worst).

✕ Fail1

Error only appears on final submit.

not assessable is recorded when the rule applied but the store could not be judged on it (bot protection, a region lock, a step we could not reach), and not applicable when the store has nothing for the rule to judge. Those stores are left out of every number on this page, never guessed. Why we do that

Why it matters

Form fields only show errors after the buyer submits, not while they type or when they leave a field.

Inline validation catches typos at the moment they happen. Submit-only validation returns a wall of red at the end, which feels like failure and triggers abandonment.

That sentence is the one a failing store sees in its own UXFix report.How rules are weighted and scored →

38 audited stores, one dot each

1 fail

PassPartialFail

Every published UXFix audit this rule could be judged on, as of 23 Sep 2026. A count of real stores, not a simulation of yours.

How we test it

Scripted walk, fresh signed-out browser · the full walk

1Fresh browserSigned out, cookies cleared, desktop and mobile viewports, the store's live theme.
2Open a productA real, in-stock product page, found the way a shopper finds one.
3Add to cartDefault variant, quantity one, then the cart page itself.
4Walk the checkoutFrom the cart to the payment step. Nothing is ever bought.
5Judge this ruleAgainst the standard above, on what a shopper can see.
6Record the verdictPass, partial or fail, saved with the screenshot it was judged on.

What the agent looks for

Inline validation on blur (not on keystroke, not only on submit).

Confidence

The rulebook rates this check’s confidence unstated. When the agent is not sure, the rule is recorded as not assessable rather than guessed.

Not judged

2 of 40 published audits: the rule did not apply or could not be judged. Dropped, never guessed.

The numbers behind the rule

Published UXFix audits · more statistics

Published audits failing this rule

1Archeryworldarcheryworld.co.uk52

No pictures here: this rule is judged by doing something, a click or a typed error, and a still picture of the page before it would show nothing. Audits run from 20 September 2026 capture the moment itself where the probe can reach it.

37 stores that do it right →All published audits

Where this rule sits among 103 UX rules

Most-failed rank

#73

Score weight rank

#10

Fail rate

Score weight: a fail costs 1.5 pts of of the 100-point score; a partial costs half that. Most-failed rank is among the 79 rules with enough published audits to report a rate.

The fix

The same steps a failing store sees in its report

A pass means: Error appears on blur.

Severity

High

Score gain

+1.5pts

Page

Checkout

Score gain is roughly what a fail-to-pass change adds; rules that could not be judged are left out, which can move it a little. Re-run a free audit after the change ships to confirm the verdict moved.

Checklist for the pass

0 of 3

Tick each step as you ship it. The audit judges the live store, so re-run it once all of them are done.