[Umbrella] Improve developer and agent feedback loops for Flutter Web #191313

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1. harryterkelsen

   added

   engineflutter/engine related. See also e: labels.flutter/engine related. See also e: labels.

   platform-webWeb applications specificallyWeb applications specifically

   team-webOwned by Web platform teamOwned by Web platform team

   on Aug 18, 2026
2. harryterkelsen

   self-assigned this

   on Aug 19, 2026
3. harryterkelsen

   added

   P1High-priority issues at the top of the work listHigh-priority issues at the top of the work list

   triaged-webTriaged by Web platform teamTriaged by Web platform team

   on Aug 19, 2026
4. yashas-hm

   added a commit that references this issue on Sep 9, 2026

   [web] Support local golden testing in flutter test (flutter#191386)

   ...

   5e10dbd
5. pull

   added a commit that references this issue on Sep 9, 2026

   [web] Support local screenshot and golden testing in felt test (flutt…

   ...

   c778297
6. harryterkelsen commented on Oct 28, 2026

   

   harryterkelsen

   on Oct 28, 2026

   ContributorAuthor

   More actions

   Progress update on the Flutter Web feedback loop umbrella:

   Three of the four major initiatives have been completed and landed:

   1. Web Engine Local Goldens ([Web Engine] Support local screenshot and golden testing in felt test #191314): Landed in [web] Support local screenshot and golden testing in felt test #191318. felt test downloads Skia Gold baselines via REST, caches them locally, performs in-memory pixel diffing, and emits failure diff images.
   2. Framework Web Local Goldens & DPR Alignment ([Web Golden Testing] Support local golden testing and DPR alignment in flutter_tools and framework #191371): Landed in [web] Support local golden testing in flutter test #191386. flutter_tools and package:flutter_goldens align DPR to 3.0 and support local baseline diffing in flutter test --platform=chrome.
   3. Web Benchmarks Standalone Runner ([Web Benchmarks] Headless single-command runner for local web benchmarks #191316): Landed across Web Benchmarks Part 2: Benchmark Targeting & Fail-Fast Filtering #194400, Add web benchmark baseline comparison, ANSI summary table, and structured JSON helpers #194609, Web Benchmarks Part 4: Standalone Local CLI Runner #194782, and [web] Add opt-in raw samples, measured sample count and warm-up phase hook to the web benchmark recorder #195118. Developers and agents can run benchmarks headlessly via dart dev/devicelab/bin/run_local_web_benchmark.dart with targeting, baseline comparison, ANSI summary tables, structured JSON output, and local engine artifact support.

   Remaining Focus:

   • Web Integration Tests ([Web Tools] Automated runner and tooling for Web integration tests #191315): Providing a zero-daemon single-command runner for package:integration_test on Web with automated chromedriver lifecycle and headless configuration.