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048-the-coockie-factory-new/docs/adr/adr-0003-docker-headless-browser.md

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# ADR-0003 Browser runs and screenshots in a Docker container
## Metadata
| Key | Value |
| --- | --- |
| ID | ADR-0003 |
| CrossReference | [BC-001], [MIL-002], [MIL-003] |
## Version History
| Date | Status | Author | Reviewer | Change | Commit |
| --- | --- | --- | --- | --- | --- |
| 2026-10-28 | Accepted | Jens Tirsvad Nielsen | AI as stand-in for S02 | Initial version | [cadc5ef] |
Allowed Status values: `Proposed`, `Accepted`, `Rejected`, `Deprecated`, `Superseded by ADR-NNNN`.
---
## Context
The bot drives a real browser and every lecture step needs a screenshot. The framework forbids testing a GUI on the host desktop because it takes the user's mouse and keyboard (`framework/process/gui-testing.md`). Options:
1. Run Chrome on the host desktop.
2. Run headless Chromium in a Docker container (Linux).
3. Run in Windows Sandbox.
## Decision
Option 2. A Dockerfile builds an image with Python, Chromium and its driver; a helper script runs the bot or a screenshot job in it. The bot takes a headless option so the same code runs on the host for users who want it.
## Consequences
**Positive:**
- No interference with the user's desktop; reproducible runs for S02.
- Screenshots are made the same way each time.
**Negative:**
- Docker is needed for the real-browser runs and screenshots (unit tests need no Docker).
- The image download is large.
## Affected Artifacts
- [BC-001] — risk of non-reproducible runs
- [MIL-002] — builds the image
- [MIL-003] — first container run
---
[BC-001]: ../business-case.md
[MIL-002]: ../milestones/mil-002-scaffold.md
[MIL-003]: ../milestones/mil-003-click-bot.md
[cadc5ef]: https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/048-the-coockie-factory-new/commit/cadc5eff21d9afc09799d4bc2e3f6ac17ab2612a