feat(ui): Add flush appearance option

[alexcarpenter]

Description

Introduce new elevation appearance option that allows rendering components "flush" on the page vs being wrapped in a card. Options include raised|flush with raised being the default for backwards compat.

Note this only applies to page-mounted components modals/popovers always use raised.

Raised	Flush

Docs: clerk/clerk-docs#3355

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	May 18, 2026 10:30pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 0103a71

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@clerk/ui	Minor
@clerk/chrome-extension	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

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📝 Walkthrough

Walkthrough

Adds an elevation appearance option for card-based UI with values 'raised' (default) and 'flush'. CardRoot reads modal context, an explicit prop, or parsed appearance options to determine elevation; flush injects element overrides and sets data-elevation="flush". Popover and profile cards (and modals) are forced to raised. The shadcn theme uses the attribute to drop shadow/border. The sandbox gets elevation and devWarnings controls with sessionStorage persistence and applies appearance updates during init.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Possibly related PRs

• clerk/javascript#8521: Adds another appearance option (autoFocus) and updates internal/appearance.ts and customizables/parseAppearance.ts, touching similar appearance-system code.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat(ui): Add flush appearance option' directly and clearly summarizes the main feature addition: introducing a new flush elevation appearance option for UI components.
Description check	✅ Passed	The description is well-related to the changeset, explaining the elevation appearance option, its raised/flush values, backwards compatibility, scope of application, and includes visual comparisons.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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commit: 0103a71

[wobsoriano]

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