# No author credibility display — dev spec
Site: yahoo.com · Priority 10 · High · Effort: Medium (2-5 days)

## Problem
Readers may doubt article accuracy without visible author credentials or review counts, reducing engagement and trust.

## Evidence (from the live site)
> Article page shows multiple H1s and CTAs like 'Watch' and 'Get Fantasy Plus', but no author bio, byline, or review count visible in the body sample.

## Current state
h1: Carson Wentz, J.J. McCarthy Get Brutal Verdict After Vikings Loss; cta: Watch; notes: No author information or credibility signals near the article content.

## Required change
h1: Carson Wentz, J.J. McCarthy Get Brutal Verdict After Vikings Loss; cta: Watch; notes: Add author byline with credentials and a 'Read more from this author' link to build trust.

## Acceptance criteria
- GIVEN a first-time visitor on the affected page
- WHEN the change is live
- THEN Add author byline with credentials and a 'Read more from this author' link to build trust.
- AND no layout regression at 375px / 768px / 1280px
- AND the changed control is keyboard-reachable with an accessible name

## Tracking
- Fire `cro_no_author_credibility_display` 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
- 315,206 visitors per variant to detect a 5.0% relative lift
- Run at least one full business cycle; duration depends on traffic

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