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Yes. Chromatic can capture responsive layouts at custom screen sizes. For Storybook, use the current Modes API to set a viewport width and height, then apply the mode to the stories you want to test. Vitest, Playwright, and Cypress use their supported viewport configuration or test context; in Cypress, Chromatic currently does not support cy.viewport().
Choose the setup that matches your test runner
Chromatic captures the DOM at the viewport size configured for a test. Storybook projects can define named viewport modes and apply them to stories. Vitest, Playwright, and Cypress instead use the viewport settings supported by their respective test integrations. See Chromatic’s Viewports guide for runner-specific setup.
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Storybook: define and apply a custom mode
For new Storybook configurations, use the Modes API. Define modes in .storybook/modes.js or .storybook/modes.ts, then select the mode on a story or component with parameters.chromatic.modes. Modes can also be configured at project level in .storybook/preview.js or .storybook/preview.ts.
// .storybook/modes.js
export const modes = {
tablet: {
viewport: { width: 800, height: 600 },
},
};// In a story file
export default {
title: 'Example/Card',
component: Card,
parameters: {
chromatic: {
modes: {
tablet: modes.tablet,
},
},
},
};Import modes from the configuration file if it is not in scope. The exact story and component exports depend on your Storybook setup; the important parts are the named mode’s viewport and selecting that mode in Chromatic parameters. A mode can also specify other global render conditions, such as theme or locale, so a responsive snapshot can represent a meaningful combination rather than width alone. See Configure viewports for stories and Modes for testing themes, viewports, locales & more.
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Vitest: configure the browser viewport
Set the viewport in the Vitest browser configuration, or set it in the test using the supported page API:
await page.viewport(800, 600);Use the configuration route when the dimensions should apply consistently to a group of tests; use the test context when a particular test needs a distinct size. Consult Chromatic’s runner guidance alongside your Vitest configuration, since the available setup depends on the browser integration in use.
Playwright: set a project or test viewport
Set a project’s viewport in Playwright configuration, or use test.use for a test or test group:
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test.use({ viewport: { width: 800, height: 600 } });A configured project viewport is suitable when a set of tests shares dimensions. A test-level viewport is useful when the size is specific to one scenario.
Cypress: use supported configuration, not cy.viewport()
Chromatic supports Cypress viewport dimensions through project-level viewportWidth and viewportHeight, or through supported test-level viewport options. Its documentation says cy.viewport() is currently unsupported by Chromatic, so do not rely on calling that command to change the dimensions for a Chromatic snapshot. Use the documented configuration or test options instead.
Set both dimensions, and decide whether to crop
A Storybook mode’s viewport can be an integer width, a width-and-height object, a width-only or height-only object, or integer strings with an optional px suffix. For example, viewport: { width: 800, height: 600 } sets both dimensions. Chromatic documents a default viewport of 1200 × 900 pixels when none is specified.
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Viewport height and snapshot height are related but not identical. Setting a viewport height sizes the browser; it does not by itself guarantee that the saved snapshot is clipped at that height. To crop to the viewport, set parameters.chromatic.cropToViewport: true. With cropping enabled, content extending below the viewport is clipped, while content shorter than the viewport is trimmed to its intrinsic height. Without a specified height, Chromatic captures to the rendered root container’s intrinsic height.
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Check size limits before adding modes
- Chromatic’s documented width and height limits for configured viewports are 200–2560 pixels per dimension.
- The maximum snapshot area is 25,000,000 pixels.
- For Safari and Firefox captures, either image dimension has a 32,767-pixel limit. Chromatic says it automatically retries at device pixel ratio 1.0 when this limit is reached.
These constraints are documented in Chromatic’s viewport configuration guidance. Consider both the viewport bounds and the total snapshot area when choosing dimensions; increasing width and height together can exceed the area limit.
Plan for separate snapshots and review
Each selected mode and viewport combination produces its own snapshot and baseline, with its own approval. Testing more sizes can expose regressions that appear only at particular breakpoints, but it also increases the number of visual changes the team must review. Use modes for the responsive states that matter to the component or story rather than multiplying snapshots without a specific check in mind.
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Chromatic advises that project-level modes are not recommended in most cases because each viewport is reviewed independently. Apply modes at the narrowest suitable scope when only certain stories need extra responsive coverage. Chromatic’s Snapshots documentation describes how snapshot variations are handled.
Prefer Modes over the legacy Storybook viewport API
Chromatic’s older chromatic.viewports API remains documented as legacy. It supports widths only and is converted into modes during capture; Chromatic plans to deprecate it. For new Storybook work—especially when height or other render conditions matter—configure the viewport with Modes instead. See Viewports (legacy).
Troubleshoot unexpected responsive snapshots
- The snapshot uses an unexpected size: Confirm the mode is selected through
parameters.chromatic.modeson the intended story or component, or check that the runner’s configured viewport is the one used for the test. - The image is taller than the browser viewport: A viewport height does not automatically crop the snapshot. Enable
parameters.chromatic.cropToViewport: trueif clipping to the viewport is intended. - A Cypress size change has no effect: Chromatic currently does not support
cy.viewport(). Set dimensions through Cypress’s supported project configuration or test-level viewport options. - A configured viewport is rejected or capture exceeds a limit: Check each dimension against the documented 200–2560-pixel range and keep the snapshot area at or below 25,000,000 pixels. Safari and Firefox also have the documented 32,767-image-pixel per-dimension limit.
- A small content page looks shorter than the chosen height: With viewport cropping enabled, content shorter than the viewport is trimmed to its intrinsic height; the viewport setting is not a promise of a fixed-height output image.
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Frequently Asked Questions
Does a Storybook viewport mode have to include both width and height?
No. Chromatic’s Modes viewport accepts a width, a width-and-height object, a width-only or height-only object, or integer strings with an optional px suffix.
Do Modes work with settings besides viewport size?
Yes. Modes can combine viewport settings with other global render settings, including theme and locale.
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