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browser-screenshot-diff

Compare two recorded browser sessions at matching step IDs using screenshots and accessibility snapshots, which describe page elements. Report the first difference and overall similarity to check interface changes or verify replayed sessions.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

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Visual + DOM diff between two recorded sessions at matching trajectory step ids; used for visual regression and replay verification

ruvnet/ruflo
설치 방법 보기

이럴 때 유용합니다

  • Checking visual regressions after interface changes
  • Verifying a replay against its original session
  • Comparing A/B variants of a form workflow
  • Locating the first difference between recorded sessions

포함된 파일(1)

  • SKILL.md2.4 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

Browser Screenshot Diff

Compare two recorded sessions step-by-step. Pairs each step in session A to the same step-id in session B, diffs the captured screenshot and accessibility snapshot, reports the first divergence and an aggregate similarity score.

When to use

  • Visual regression after a UI change (record before, record after, diff).
  • Verifying a browser-replay run matches the parent session within tolerance.
  • Comparing two A/B variants of the same form flow.

Steps

  1. Locate both RVF containers: 
    npx -y ruvector@0.2.27 rvf status <session-id-a>.rvf
npx -y ruvector@0.2.27 rvf status <session-id-b>.rvf
  2. Load both trajectories from trajectory.ndjson. Build a step-id → (screenshot_path, snapshot_path) map for each.
  3. Pair steps by step-id. Steps that exist on only one side are flagged as unmatched and contribute to the divergence score.
  4. Pixel diff (--mode pixel|both): compare the two PNGs at each step. Report mse, psnr, and the bounding box of the largest diff cluster. Threshold default 0.02 (2% of pixels).
  5. DOM diff (--mode dom|both): compare the accessibility snapshots node-by-node. Report added / removed / changed nodes with their accessible names.
  6. Aggregate similarity: weighted average across matched steps, weighted by step duration. Verdict goes into a new findings.md under a fresh RVF container so the diff itself is replayable.
  7. Persist the diff verdict in browser-sessions under both source ids' tags so future searches surface "ran a diff against session X".

Caveats

  • Pixel diff is sensitive to font hinting, antialiasing, and scrollbar position. Keep viewport pinned across both sessions.
  • DOM diff over Playwright's accessibility tree is more stable than HTML diff. Prefer it.
  • This skill does not handle dynamic content (clocks, ads); add ignore regions to the field map or pre-process snapshots before diffing.
  • The browser_screenshot_diff MCP tool is not planned (ADR-0001 §7); the skill operates against locally-saved RVF artifacts and uses browser_eval only for live verification.

리뷰

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