Interface interference · European Union
Hidden information
Hidden information places material facts where users are unlikely to notice them before deciding, for example, behind vague links or late in checkout. Existing EU consumer rules already require important information in many transactions and prohibit misleading omissions. Whether a particular layout breaches a rule depends on what was omitted, the medium, timing and likely effect on the consumer's decision.
- Family
- Interface interference
- Also known as
- Journey stages
Definition
What is this pattern?
Information relevant to the decision is absent or presented so ineffectively that it is unlikely to inform the user at the decision point. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.
How it works
Information relevant to the decision is absent or presented so ineffectively that it is unlikely to inform the user at the decision point. A consequence that could change the decision is moved out of the comparison or commitment view, reduced in salience or split across remote disclosures.
Warning signs
- The information is plausibly material to a concrete decision.
- It is missing, hidden, low-salience, unclear, inaccessible, untimely or overwhelming.
- The deficiency is tied to a likely influence mechanism or detriment.
Potential harms
- A traveller may select an unsuitable fare because a material restriction is absent from the comparison decision.
- A customer may buy unsuitable cover because a material limitation cannot inform the decision.
Learn by comparison
What does this look like?
These fictional examples make the design mechanism easier to recognise. They do not depict a real company and do not establish that an individual interface is unlawful.
Illustrative example 1 · Rail fare comparison
A fictional rail booking page labels a fare “Flexible Saver” but places the fact that it is non-refundable inside a collapsed section reached only after passenger details.
Potential consumer harm: A traveller may select an unsuitable fare because a material restriction is absent from the comparison decision.
Illustrative example 2 · Home-services plan
A fictional repair plan headlines “Every appliance covered” but splits an exclusion for boilers across three collapsed help tabs reached only after booking.
Potential consumer harm: A customer may buy unsuitable cover because a material limitation cannot inform the decision.
Illustrative example 3 · Travel checkout
A booking flow shows a headline fare, while a non-refundable condition appears only inside an accordion labelled ‘More’ after the traveller has entered passenger details.
Potential consumer harm: The traveller may invest time and proceed without appreciating a material restriction on changing the booking.
Illustrative example 4 · Software subscription
A monthly price is prominent, but the minimum twelve-month commitment appears only in muted text beneath the final payment control.
Potential consumer harm: The user may understand the offer as cancellable monthly and make a different transactional decision.
What is a fairer alternative?
Put material price, duration, renewal, limitation and cancellation information beside the relevant decision, using specific headings and readable contrast. Progressive disclosure can organise detail, but the first layer should expose facts likely to change the decision.
Legal and information status
Legal position at a glance
Not every collapsed section is problematic. The central questions are whether the fact is material, whether the consumer receives it before being bound, how clearly it is expressed and whether the overall presentation is likely to cause a transactional decision they otherwise would not take.
UCPD Articles 6 to 7
Express rule
Misleading actions and omissions can include unclear, unintelligible, ambiguous or untimely presentation of material information.
CRD Articles 6 and 8
Express rule
Distance-contract information duties require specified information in a clear and comprehensible manner before the consumer is bound.
Evidence layers and open questions
Applicable law, enforcement records, policy preparation, stakeholder input, editorial analysis and unknown future details remain visibly distinct.
Current lawCurrent law
UCPD Article 7 addresses omitted, hidden, unclear, unintelligible, ambiguous, or untimely material information where the transactional-decision test is met. CRD Articles 6 and 8 contain specific pre-contract and ordering information rules for covered distance/off-premises contracts. UCTD Article 5 concerns plain and intelligible terms. GDPR Articles 12 to 14 apply to personal-data information.
Current enforcementCurrent law
The 2022 CPC sweep reported 70 screened websites hiding or reducing the visibility of important information. Authorities described sweep results as potential UCPD issues; individual final outcomes require separate verification.
Officially announcedOfficially announced
The announced DFA includes dark patterns, digital contracts, and price marketing among preparation areas and may also simplify selected information requirements. Topic identification in preparation material is not a published DFA duty.
Under considerationUnder consideration
The DFA call for evidence considers possible policy responses relevant to hidden information but expressly does not prejudge the Commission's decision. It establishes no pattern-specific duty, threshold or remedy.
Stakeholder proposalStakeholder proposal
The factual consultation report records respondent submissions. It is not a Commission position. Any respondent proposal addressing hidden information remains stakeholder input unless it is later adopted in published Commission text.
Editorial analysisEditorial analysis
Commission studies and the Fitness Check identify information overload as well as concealment as problems. More text is not automatically a fairer interface; salience, timing, and comprehension matter.
UnknownUnknown
No published DFA proposal establishes a final definition, actor scope, legal threshold, duty, remedy, transition rule or application date for hidden information. Those details remain unknown pending primary legislative text.
Context matters
Context and boundary cases
- The information is plausibly material to a concrete decision.
- It is missing, hidden, low-salience, unclear, inaccessible, untimely or overwhelming.
- The deficiency is tied to a likely influence mechanism or detriment.
- Exclude or qualify the label where purely optional detail with no plausible decision relevance.
- Exclude or qualify the label where late mandatory charge or subscription term already classified under the more specific sneaking pattern for the same evidence.
When a similar design can serve a legitimate purpose
- A similar design should not be classified this way where purely optional detail with no plausible decision relevance.
- A similar design should not be classified this way where late mandatory charge or subscription term already classified under the more specific sneaking pattern for the same evidence.
Operational review
What teams should review
- Teams
- Do “Choose €64 fare” and “Review fare conditions” receive comparable prominence and explain their consequences before activation?
- Place the compared prices, billing periods and material terms on one evidence sheet; where does it support “The information is plausibly material to a concrete decision”?
- What neutral rendering or comprehension result would falsify the classification, particularly in light of “Purely optional detail with no plausible decision relevance”?
- Do “See full terms” and “Review coverage” receive comparable prominence and explain their consequences before activation?
- Capture the collapsed and expanded states plus the associated decision control; is “It is missing, hidden, low-salience, unclear, inaccessible, untimely or overwhelming” visible at the right time?
- What neutral rendering or comprehension result would falsify the classification, particularly in light of “late mandatory charge or subscription term already classified under the more specific sneaking pattern for the same evidence”?
- Which complete journey evidence supports or contradicts the hidden or low-salience material information classification?
Evidence to retain
- Versioned captures of the Pricing states before, during and after the relevant decision
- Configuration, content and event records supporting the observed hidden or low-salience material information mechanism
- Responsive, keyboard and assistive-technology review of every material option and consequence
- Price-component, offer-version and calculation records linked to the captured screen
Legal map and implementation tools
Evidence base
Sources
- Dark commercial patternsOrganisation for Economic Co-operation and Development · Secondary · checked 2026-09-14 · OECD Digital Economy Papers No. 336
- Unfair Commercial Practices DirectiveEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Directive 2005/29/EC; CELEX 02005L0029-20220528
- Consumer Rights DirectiveEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Directive 2011/83/EU; CELEX 02011L0083-20220528
- Digital Fairness Act: call for evidence for an impact assessmentEuropean Commission · Primary · checked 2026-08-09 · Initiative 14622; Ares(2025)6275573
- Unfair Contract Terms DirectiveCouncil of the European Communities · Primary · checked 2026-08-09 · Council Directive 93/13/EEC; CELEX 01993L0013-20220528
- General Data Protection RegulationEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Regulation (EU) 2016/679; CELEX 32016R0679
- Consumer Protection Cooperation Network sweepsEuropean Commission · Primary · checked 2026-09-14
- Review of EU consumer lawEuropean Commission, Directorate-General for Justice and Consumers · Primary · checked 2026-09-14
- 2030 Consumer Agenda and action plan for consumers in the Single MarketEuropean Commission · Primary · checked 2026-08-09 · COM(2025) 848 final; CELEX 52025DC0848
- Digital Fairness Act: factual summary report of the public consultationEuropean Commission · Primary · checked 2026-08-09 · Ares(2025)11434262
- Fitness Check of EU consumer law on digital fairnessEuropean Commission · Primary · checked 2026-09-14 · SWD(2024) 230 final
- Commission work programme 2026: Europe's Independence MomentEuropean Commission · Primary · checked 2026-09-14 · COM(2025) 870 final; CELEX 52025DC0870; Annex I item 30