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muji.us →CRT-022Cart · mobileMedium
Cart usable on mobile without horizontal scroll
Cart usable on mobile without horizontal scroll.
Free · no card · runs all rules at once · judged on 39 stores · updated
5%of the audited stores we could judge fail this rule
27 pass10 partial2 failPublished audits · September 2026
Stores judged
39
of 40 published audits
Score weight
0.9pts
of the 100-point score
Page share
20%
of the score is the cart
What earns each verdict
Same outcomes on every UXFix rule · how verdicts work✓ Pass27
No horizontal overflow.
✕ Fail2
Horizontal scrollbar or content off-screen.
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
The cart page is broken on mobile: content overflows the viewport, requires horizontal scrolling, or has buttons that fall off the screen.
More than 60% of ecommerce traffic is mobile. A cart that requires horizontal scrolling doesn't lose 60% of buyers, it loses closer to 90% of the mobile ones. This is fatal and easy to check with a phone.
That sentence is the one a failing store sees in its own UXFix report.How rules are weighted and scored →
39 audited stores, one dot each
2 failPassPartialFail
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.
- 4Judge this ruleAgainst the standard above, on what a shopper can see.
- 5Record the verdictPass, partial or fail, saved with the screenshot it was judged on.
What the agent looks for
Cart usable on mobile without horizontal scroll.
Confidence
The rulebook rates this check’s confidence High. When the agent is not sure, the rule is recorded as not assessable rather than guessed.
Not judged
1 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 statisticsWhere this rule sits among 103 UX rules
Most-failed rank#70
Score weight rank#69
Fail rate5%
Score weight: a fail costs 0.9 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 issue, on real stores
from each store's own published audit1 of the stores that fail this rule, each shown on the screen it was judged on, with the problem area marked. The picture is the store's own capture on the date shown, and stores change.
The fix
The same steps a failing store sees in its reportA pass means: No horizontal overflow.
Severity
Medium
Score gain
+0.9pts
Page
Cart
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 3Tick each step as you ship it. The audit judges the live store, so re-run it once all of them are done.
Every store that fails this rule
| # | Store | Score | Audited | Published audit |
|---|---|---|---|---|
| 1 | Mujimuji.us | 61 | Open audit | |
| 2 | Reebokreebok.com | 57 | Open audit |
What our auditors say about this rule
A cart that scrolls sideways on a phone was never opened on a phone.
Written by the person who audits this rule, and reviewed every quarter.
Keep going
All rules →RuleCRT-001
Cart shows full cost breakdown: items, shipping estimate, tax estimateCart · Critical ›RuleCRT-002
Shipping estimator (ZIP/country) available in cartCart · High ›RuleCRT-003
Tax shown or clearly labeled as calculated at checkoutCart · High ›RuleCRT-005
Delivery estimate for each item visible in cartCart · Medium ›RuleCRT-006
Discount/promo application shows explicit line item, not silent adjustmentCart · Medium ›RuleCRT-007
Line items editable in place (qty, variant, remove) without page reloadCart · High ›RuleCRT-010
Primary checkout CTA visually dominant on the pageCart · High ›RuleCRT-011
Express wallet options (Apple/Google/Shop Pay) present in cartCart · High ›