[Browser Run] Document Vitest Browser Mode provider

[irvinebroque]

Summary

Adds a Browser Run CDP how-to for running Vitest Browser Mode tests on Browser Run hosted Chromium with @cloudflare/vitest-browser-run-provider.

Also adds cross-links from Browser Run CDP/examples/integration methods, Workers testing and Vitest integration docs, and the Cloudflare Vite plugin tunnel reference. Adds both a global changelog post and a Browser Run release note entry.

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/changelog/	@cloudflare/pm-changelogs, @cloudflare/product-owners
/src/content/docs/browser-run/	@mchenco, @cloudflare/product-owners, @celso, @kathayl, @dcpena, @meddulla, @simonabadoiu, @jonnyparris, @ruifigueira, @Refaerds, @omarmosid
/src/content/docs/workers/	@cloudflare/workers-docs, @GregBrimble, @irvinebroque, @mikenomitch, @korinne, @WalshyDev, @cloudflare/deploy-config, @cloudflare/product-owners, @cloudflare/wrangler, @MattieTK, @cloudflare/dev-plat-leads, @vy-ton
/src/content/partials/browser-run/	@mchenco, @cloudflare/product-owners, @celso, @kathayl, @dcpena, @meddulla, @simonabadoiu, @jonnyparris, @ruifigueira, @Refaerds, @omarmosid
/src/content/release-notes/browser-run.yaml	@mchenco, @cloudflare/product-owners, @celso, @kathayl, @dcpena, @meddulla, @simonabadoiu, @jonnyparris, @ruifigueira, @Refaerds, @omarmosid

[ask-bonk]

UnknownError: The operation timed out.

github run

[ask-bonk]

Clean addition. Two items to address before merge.

[ask-bonk]

Page titles must use imperative mood, not gerund phrases (style guide: 'Install Wrangler' not 'Installing Wrangler').

[ask-bonk]

This cross-link breaks the flow of the Assertions example. Move it to the end of the section, after the code block and before the heading.

[ask-bonk]

Posted 2 suggestions and applied labels (documentation, content:new) on PR #31883.

Summary of changes

• Adds a new how-to page (/browser-run/cdp/vitest-browser-mode/) for running Vitest Browser Mode tests on Browser Run hosted Chromium via CDP.
• Adds a global changelog entry and a Browser Run release note for the @cloudflare/vitest-browser-run-provider launch.
• Cross-links the new page from Browser Run CDP, examples, and integration-method pages; from Workers testing docs; and from the Vite plugin tunnel reference.

Issues that need attention

• MEDIUM — src/content/docs/browser-run/cdp/vitest-browser-mode.mdx line 3: Page title uses a gerund phrase (Using with Vitest Browser Mode (CDP)). The style guide requires imperative mood for page titles (e.g., Use Vitest Browser Mode (CDP)). Posted an inline suggestion.

• MEDIUM — src/content/docs/browser-run/playwright/index.mdx line 159: The Vitest Browser Mode cross-link is inserted between the Assertions intro paragraph and its code example, breaking the flow. Move it to the end of the section, after the code block and before the ### Storage state heading.

github run

[github-actions]

Preview URL: https://0fa63d67.preview.developers.cloudflare.com
Preview Branch URL: https://docs-vitest-browser-run.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/browser-run/cdp/vitest-browser-mode/	https://docs-vitest-browser-run.preview.developers.cloudflare.com/browser-run/cdp/vitest-browser-mode/
https://developers.cloudflare.com/changelog/post/2026-07-03-vitest-browser-mode-provider/	https://docs-vitest-browser-run.preview.developers.cloudflare.com/changelog/post/2026-07-03-vitest-browser-mode-provider/
https://developers.cloudflare.com/browser-run/cdp/	https://docs-vitest-browser-run.preview.developers.cloudflare.com/browser-run/cdp/
https://developers.cloudflare.com/browser-run/examples/	https://docs-vitest-browser-run.preview.developers.cloudflare.com/browser-run/examples/
https://developers.cloudflare.com/browser-run/playwright/	https://docs-vitest-browser-run.preview.developers.cloudflare.com/browser-run/playwright/
https://developers.cloudflare.com/workers/testing/	https://docs-vitest-browser-run.preview.developers.cloudflare.com/workers/testing/
https://developers.cloudflare.com/workers/testing/vitest-integration/	https://docs-vitest-browser-run.preview.developers.cloudflare.com/workers/testing/vitest-integration/
https://developers.cloudflare.com/workers/vite-plugin/reference/api/	https://docs-vitest-browser-run.preview.developers.cloudflare.com/workers/vite-plugin/reference/api/
https://developers.cloudflare.com/workers/testing/vitest-integration/write-your-first-test/	https://docs-vitest-browser-run.preview.developers.cloudflare.com/workers/testing/vitest-integration/write-your-first-test/

[github-actions]

CI run failed: build logs

[irvinebroque]

/bonk address all feedback

[ask-bonk]

Done. Addressed both review items on PR #31883:

1. Page title (vitest-browser-mode.mdx): Changed from the gerund phrase Using with Vitest Browser Mode (CDP) to the imperative Use Vitest Browser Mode (CDP).

2. Cross-link placement (playwright/index.mdx): Moved the Vitest Browser Mode cross-link from between the Assertions intro paragraph and its code example to the end of the section, after the code block and before the ### Storage state heading. Also updated the link text to match the new imperative title.

github run