Sneak into basket
Removed accessory returns after cart refresh
A fictional store adds a cable bundle to a laptop order, lets the shopper remove it, then silently restores it when the delivery postcode changes.
Individual HTML example · Sneaking
Donation added without a deliberate choice
A fictional grocery service inserts a $2 charity donation into the basket when the shopper chooses a delivery slot, without showing a selection control.
This is an original fictional comparison. It depicts no real business and is not a regulator finding, statutory category or legal safe harbour.
Donation added without a deliberate choice
A fictional grocery service inserts a $2 charity donation into the basket when the shopper chooses a delivery slot, without showing a selection control.
Order total · $64. A $2 donation appears after delivery selection without an add action.. Donation included. Add $2 donation
Order total · $62. Donation choices are optional, unselected and visible before the total changes.. Amount affected: $2. Add $2 donation. Donation included. Payable total and selected items, expanded: The summary shows the line items and total before “Add $2 donation” is activated.
Why the first version can mislead: The final commercial state diverges from the choice represented earlier in the journey. The problematic state records: “A $2 donation appears after delivery selection without an add action.” Review the timing and affirmative selection needed before “Donation included” changes price, product or recurring liability. The shopper may pay an additional amount that was never deliberately added.
What a fairer design does: Leave donations out of the basket until the shopper selects a clearly priced option.
Show annotated differences (4)
Potentially problematic version
- A $2 donation appears after delivery selection without an add action.Why this state matters: The final commercial state diverges from the choice represented earlier in the journey. The problematic state records: “A $2 donation appears after delivery selection without an add action.” Review the timing and affirmative selection needed before “Donation included” changes price, product or recurring liability. The shopper may pay an additional amount that was never deliberately added.
- Add $2 donationReview prompt: Which affirmative action authorises “Donation included”, and where is the resulting price, product or recurring state shown before commitment?
Neutral alternative
- Donation choices are optional, unselected and visible before the total changes.Fairer design: Leave donations out of the basket until the shopper selects a clearly priced option.
- Payable total and selected items, expanded: The summary shows the line items and total before “Add $2 donation” is activated.Review prompt: Compare the basket before and after the action, including total and line items; does the mutation satisfy “A line item or quantity appears after a transition”?
Review questions (3)
- Which affirmative action authorises “Donation included”, and where is the resulting price, product or recurring state shown before commitment?
- Compare the basket before and after the action, including total and line items; does the mutation satisfy “A line item or quantity appears after a transition”?
- Which specific affirmative event creates the final commercial state, and could “Tax or unavoidable charge represented separately” explain the observed outcome instead?
Complete practice context
How this example relates to Sneak into basket
A paid or consequential item is added to a basket or transaction without a clear, deliberate and specific user choice. This is a design and research taxonomy for learning and evidence review, not a statutory offence label or an automatic finding that an interface is unlawful.
The full guide explains inclusion and exclusion criteria, potential harms, fairer design, evidence questions and separate Australian legal information layers. The example page isolates one scenario so it can be shared and discussed without reproducing the complete library on one page.
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Sources and provenance for this example
Evidence base
Sources
- Dark commercial patternsOrganisation for Economic Co-operation and Development · Secondary · checked 2026-09-14 · OECD Digital Economy Papers No. 336
- Competition and Consumer Amendment (Unfair Trading Practices) Act 2026Federal Register of Legislation · Primary · checked 2026-09-14 · C2026A00064