# Out-of-stock notification form — dev spec
Site: allbirds.com · Priority 7 · High · Effort: Medium (2-5 days)

## Problem
The product page for the Anytime Ankle Sock shows a 'Get Notified' CTA, indicating an out-of-stock state, but the form likely only captures an email, missing the opportunity to capture intent and follow up with alternatives.

## Evidence (from the live site)
> The product page CTAs include 'Get Notified' and 'Learn More', and the page title is 'Anytime Ankle Sock | Allbirds'. The inventory shows no add-to-cart button on this page, suggesting it's out of stock.

## Current state
h1: Anytime Ankle Sock; cta: Get Notified; notes: Out-of-stock product with a notification form, likely single email field.

## Required change
h1: Anytime Ankle Sock; cta: Notify Me When Back in Stock; notes: Enhance the notification form to also offer 'Email me alternatives' or 'Notify me of similar products' to retain customer interest and capture broader intent.

## Acceptance criteria
- GIVEN a first-time visitor on the affected page
- WHEN the change is live
- THEN Enhance the notification form to also offer 'Email me alternatives' or 'Notify me of similar products' to retain customer interest and capture broader intent.
- AND no layout regression at 375px / 768px / 1280px
- AND the changed control is keyboard-reachable with an accessible name

## Tracking
- Fire `cro_out_of_stock_notification_form` on interaction with the changed element
- Verify the event fires in BOTH variants before opening traffic

## Test plan
- Two-proportion z-test, 95% significance, 80% power
- 299,882 visitors per variant to detect a 5.0% relative lift
- Run at least one full business cycle; not testable at current traffic

## Rollback
Feature-flag the change; revert if the primary metric drops for 3 consecutive days.