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Playwright ARIA snapshots let you assert that a page or component exposes the accessible roles, names, text, hierarchy, and selected states or properties your test expects. Use a page snapshot when the page-wide structure is the contract; use a locator snapshot for a focused component. These are structural checks, not proof that an interface is fully accessible.
How do I use ARIA snapshots in Playwright?
Write a template for the accessible structure that matters, then pass it to toMatchAriaSnapshot(). For a small page-level check:
import { test, expect } from '@playwright/test';
test('account settings expose the expected controls', async ({ page }) => {
await page.goto('/account/settings');
await expect(page.getByRole('main')).toMatchAriaSnapshot(`
- heading "Account settings"
- button "Save changes"
`);
});The template is YAML-like: each line describes an accessible node and its relationship to other nodes. Here, the assertion checks that the main region contains the named heading and button in the represented order. The matcher is documented as available from Playwright v1.60; confirm your installed version and language binding in the Playwright API reference before adopting it.
Use the scope your test owns
A page-level assertion makes sense when the intended contract spans the page. A locator-scoped assertion narrows the contract to a component or region, making the test less sensitive to unrelated parts of the interface.
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await expect(page.getByRole('dialog', { name: 'Confirm deletion' }))
.toMatchAriaSnapshot(`
- dialog "Confirm deletion":
- paragraph: "This action cannot be undone."
- button "Cancel"
- button "Delete"
`);For a dialog test, first put the interface into the relevant state—such as opening the dialog—then assert its accessible structure. The same principle applies to selected tabs, expanded menus, and other stateful components.
How should I choose what the snapshot matches?
Snapshots are order-sensitive, and the template can be more or less strict. Decide which accessible details form the behavior contract, rather than copying every exposed detail into a brittle baseline.
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- Names and attributes: Include them when they matter to the user-facing contract. Omitting a name or attribute leaves that detail unconstrained by the template.
- Child matching: The documented child modes are
contain(the default),equal, anddeep-equal. Use containment when unrelated children may be added without changing the contract. Use equality when the complete child list matters;deep-equalapplies stricter matching through the descendant structure. - Hierarchy and order: Reflect relationships users and assistive technologies rely on, but avoid asserting incidental structure with no product meaning.
For a small assertion, keep the template inline beside the test. If a longer baseline is easier to review separately, Playwright supports named .aria.yml snapshot files. The official ARIA snapshots guide describes snapshot syntax, matching, and generation approaches.
How do I generate and update an ARIA snapshot?
- Set up the relevant UI state. Navigate to the page and perform the user action needed to expose the state under test.
- Choose a scope. Use the page or a locator that represents the page region or component your test owns.
- Inspect or generate a starting template. Playwright’s code generator can generate a starter snapshot. You can also call
page.ariaSnapshot()orlocator.ariaSnapshot()to inspect the current accessible structure, or start with an empty template. - Run the test and examine the mismatch. Determine whether the actual change is intentional and user-relevant, or a regression.
- Update only after review. For an intentional accessible-structure change, run
npx playwright test --update-snapshots, then inspect the resulting patch before accepting it. Playwright documents patch, three-way, and overwrite update-source methods; choose the approach supported by your project and review the diff rather than treating generated output as approval.
Snapshot generation gives you a proposal based on the current UI, not evidence that the UI is correct. Blindly accepting an updated baseline can encode a regression as the new expectation.
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What does a Playwright ARIA snapshot test actually check?
A passing assertion means the accessible structure represented to Playwright matched the template under the selected matching rules. It can check exposed roles, accessible names, hierarchy, text, and states or properties included in the snapshot. That makes it useful for catching structural changes that ordinary visual checks may not describe.
It does not, by itself, establish that keyboard interaction works, focus is managed correctly, visual presentation is usable, a particular screen reader announces the interface as intended, or every applicable accessibility requirement is met. Pair structural assertions with interaction tests and appropriate accessibility evaluation. The W3C WAI-ARIA 1.2 Recommendation explains that ARIA semantics are conveyed through user agents to assistive technologies; a snapshot of represented structure is only one part of that experience.
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Prefer native semantics where appropriate
ARIA snapshots can expose whether the intended semantics appear in the accessible structure, but they do not make unnecessary ARIA a good fix. W3C guidance says to use native host-language semantics when an equivalent feature is available and appropriate, and to use ARIA where host languages lack semantics or need enhancement. As the Recommendation puts it, “WAI-ARIA (Accessible Rich Internet Applications) is intended to provide missing semantics so that the intent of the author may be conveyed to assistive technologies.”
Common problems and fixes
- The matcher is unavailable: Check the installed Playwright version; the page assertion reference identifies
toMatchAriaSnapshotas added in v1.60. Also check the matching locator API for your language and version. - The assertion fails after an unrelated page edit: Scope the assertion to the component or region whose contract the test owns, or loosen child matching if unrelated additions are allowed.
- The assertion misses a meaningful change: Add the name, state, property, or parent-child relationship that defines the contract. A template that omits a detail does not constrain it.
- The diff is unexpectedly large: Inspect the actual UI state, scope, ordering, and generated structure before updating. Confirm that the correct dialog, selected tab, or other state is active.
- A snapshot passes but users still encounter accessibility issues: Add keyboard and focus interaction checks, and evaluate visual and assistive-technology behavior as appropriate. A structural snapshot is not a complete accessibility test.
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For screenshots of the same page during visual review, ScreenshotNeo provides a website screenshot API and MCP server. It does not replace Playwright ARIA assertions: screenshots show rendered appearance, while these assertions check accessible structure.
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