[Minwook Shin (minwookshin)]

Pull Request

📖 Description

Document reserved declarative syntax and how to display literal code samples. Link template-structure errors to the guide and cover both diagnostics in browser tests.

🎫 Issues

Fixes #7310.

📑 Test Plan

• Built all 9 workspaces, including the website, and regenerated both export-size reports from the merged source.
• Ran the source (4,661), declarative-fixture (618) and harness (138) browser tests, plus the Node suites. All passed on the October 27 merge; 7 existing source tests were skipped.
• npm run format:check, npm run checkchange and npm run test:validation passed after the merge.

✅ Checklist

General

• I have included a change request file using $ npm run change
• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Agents

• I have linked to an existing issue in this project that this change addresses
• I have read the skills
• I have read the DESIGN.md file(s) in packages relevant to my changes
• I have updated the DESIGN.md file(s) in packages relevant to my changes

[azure-pipelines]

Azure Pipelines:
There may be pipelines that require an authorized user to comment /azp run to run.

[Minwook Shin (minwookshin)]

Merged main, keeping the new HTML comment warning and the reserved syntax guide. The full build, Node and browser tests, formatting and change-file checks pass.

[Minwook Shin (minwookshin)]

Merged main and regenerated the conflicting size reports. All 9 workspace builds, 5,417 browser tests, Node suites, formatting and change-file checks pass. Could a maintainer approve the new CI runs?