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A white Cypress screen is a symptom, not one specific failure. First identify which layer is blank: the Cypress runner, the application under test (AUT), or the component under test (CUT). Then capture the first preparation error or browser-console exception before changing configuration. That evidence usually points to the responsible file, request, bundler, provider, browser process, or environment difference.
Use the workflow below in order: classify the blank layer, inspect the first error, separate spec preparation from application runtime, verify Component Testing setup and styles, then investigate browser/CDP and headed-versus-headless differences. Avoid globally suppressing exceptions; doing so can hide the defect that produced the blank view.
1. Identify what is actually blank
Look at the whole Cypress window, not just the page-shaped preview. The location of the blank area determines the next diagnostic step.
| What you see | Likely layer | First evidence to collect |
|---|---|---|
| The Cypress app, spec list, or command log never becomes usable | Runner or browser process | Cypress terminal output, browser launch behavior, and CDP errors |
| The runner is usable, but a visited site is empty | Application under test (AUT) | Browser Console, Network panel, and the first failed request |
| The component-test canvas is empty while the runner is usable | Component index, dev server, support file, or mount | Dev-server terminal, component index HTML, support imports, and the mount call |
| DOM nodes exist but the canvas appears white or unstyled | CSS or missing page-level setup | Elements panel and computed styles |
Use the Elements panel to distinguish “nothing mounted” from “mounted but invisible.” A DOM tree with elements, zero-sized containers, white-on-white text, or missing layout styles is a rendering/setup problem rather than a failed import.
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2. Capture the first error before changing anything
- Reload the failing spec. Record the first red message in the Cypress error panel, including exception name, source file, line number, and failed request.
- Open browser Developer Tools. Read the first uncaught exception and rejected promise in Console, then inspect Network for the request that failed before the page went blank.
- Save terminal output. Keep the command, browser name, Cypress version, and any dev-server or browser-launch messages with the failure.
- Repeat once without suppressing errors. Cypress fails a test on an uncaught application exception by default; that failure is useful evidence, not noise.
Do not begin with a global uncaught:exception handler that returns false. That can make the runner look healthy while the application still throws during startup.
3. Repair spec and support-file preparation failures
If Cypress says it could not prepare the test file, the browser may show an empty preview because the spec never compiled or loaded. Check these items in order:
- The spec and support files exist at the paths configured for the project.
- JavaScript, TypeScript, JSX, or TSX syntax is valid.
- Every relative and package import resolves from the project directory.
- Dependencies are installed in the environment running Cypress.
- The configured preprocessor or bundler can handle the file extension and module syntax.
Fix the first preparation error, then rerun the spec. A later browser symptom is often just a consequence of an earlier compile or dependency failure.
4. Trace the Component Testing load chain
Component Testing has more moving parts than a simple page visit. Cypress starts the configured Vite or Webpack dev server, compiles the spec and support file, serves the component index, loads that index in the browser, and dynamically imports the test. A failure at any point can leave the CUT area empty.
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Confirm that the framework and bundler match the project. For example, a React project using Vite needs a component configuration that names React and Vite rather than a Webpack adapter. Treat this as a pattern and adapt it to your installed Cypress version and framework:
import { defineConfig } from 'cypress'
export default defineConfig({
component: {
devServer: {
framework: 'react',
bundler: 'vite'
},
specPattern: 'cypress/component/**/*.cy.{js,jsx,ts,tsx}'
}
})Run the component command and watch the terminal that owns the dev server. Missing plugins, unresolved aliases, port conflicts, and compile errors should appear there even when the browser canvas is white.
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Check the component index and support file
Open cypress/support/component-index.html and verify that its root markup is compatible with the component. Check cypress/support/component.* for imports that fail during startup, especially global CSS, fonts, polyfills, and test-only providers.
Recreate required providers in cy.mount()
Cypress mounts a component into a blank canvas. It does not automatically reproduce every production router, state provider, theme, root selector, or context. If the component reads a context value during render, provide that value in the test:
import { mount } from 'cypress/react'
import { ThemeProvider } from '../src/theme'
import { App } from '../../src/App'
it('renders the app shell', () => {
mount(
<ThemeProvider>
<App />
</ThemeProvider>
)
})Use the equivalent mount helper for your framework. A missing provider commonly produces an immediate runtime exception rather than a useful visual message.
Import global styles deliberately
Production entry points often import resets, component CSS, and theme variables. Component tests may bypass that entry point. Import the required stylesheet from the component support file or the component index, and confirm that selectors such as #app match the test index. If elements exist in the DOM but have no dimensions or colors, fix this setup before changing the component code.
5. Fix application runtime and cross-origin errors
For an AUT that goes blank after cy.visit() or a CUT that disappears immediately after mounting, read the browser Console stack trace. Common causes include an exception during render, an initialization promise that rejects, or a failed API response that the application does not handle.
Cross-origin scripts
When an exception originates in a cross-origin script, the detailed error is printed in Developer Tools rather than fully surfaced in the Cypress panel. Adding a suitable crossorigin attribute and compatible CORS response header can make the stack trace available for debugging. Apply that change to the asset or server you control; do not hide the failure with a blanket exception handler.
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Expected exceptions only
If a test intentionally verifies that an operation throws, scope the exception listener to that test and assert the expected error. Returning false for every uncaught exception can turn a real blank-screen defect into a false pass.
cy.on('uncaught:exception', (err) => {
expect(err.message).to.contain('expected validation error')
return false
})Use this pattern only when the exception is part of the behavior under test. Remove it while diagnosing an unexplained white screen.
6. Investigate a browser that will not render or connect
If the entire browser view is empty, closes, or never becomes controllable, treat it as a launch or connection problem rather than an application problem.
Check CDP and the browser process
Cypress retries its Chrome DevTools Protocol connection for up to 50 seconds after launching a browser. A timeout means the process started but Cypress could not reach its debugging port. Check:
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- Available memory and whether the operating system killed the browser.
- GPU drivers and hardware acceleration issues.
- Endpoint-security or antivirus rules that terminate or inject into the browser.
- Proxy or VPN handling of
localhostand127.0.0.1. - Custom arguments in
before:browser:launchthat disable or change remote debugging.
Inspect enterprise browser policy
On managed Chrome or Edge, open chrome://policy or edge://policy and inspect RemoteDebuggingAllowed. Cypress requires that policy to be undefined or enabled. As an isolation test, try Electron. Chrome for Testing is another option for pinned, reproducible automation and is generally outside branded-Chrome enterprise policy.
7. Compare headed and headless execution
A blank result that occurs only in CI or headless mode usually indicates an environment difference, not a random Cypress failure. Reproduce it visibly:
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npx cypress run --headed --no-exit --browser chromeWith the browser open, inspect the final DOM, Console, and Network state at the failing step. Compare the same spec in Electron, Chrome for Testing, and the browser used by CI. Cypress documents 1280×720 with device-pixel ratio (DPR) 1 as headless defaults, so viewport-sensitive CSS, breakpoint logic, and canvas rendering can differ from a local headed run.
- Record the browser family and exact executable used by local and CI runs.
- Set an explicit viewport when the application depends on breakpoints.
- Compare environment variables, base URLs, authentication state, and proxy settings.
- Use a screenshot, video, or Test Replay to see whether the page was blank from the first paint or became blank after a command.
8. Reset stale installation state and enable diagnostics
Clear the Cypress cache when binaries or installation state are suspect
After an upgrade, interrupted install, or browser-binary change, clear the Cypress cache and relaunch. Then run:
npx cypress infoUse its output to verify detected browsers and paths. If auto-detection chooses the wrong browser, pass an explicit executable with --browser <path>.
Turn on Cypress debug logs
In the Cypress browser console, enable verbose logging:
localStorage.debug = 'cypress*'Reload the runner and inspect the additional messages. Remove the setting after diagnosis:
delete localStorage.debug9. Reduce the failure to a minimal reproduction
- Split a large spec so that one test mounts or visits only one target.
- Remove unrelated commands, intercepts, fixtures, and plugins.
- Run the smallest case in another browser and in the environment where it fails.
- Keep the first exception, terminal output, browser details, and a screenshot or video.
- Reintroduce providers, styles, network calls, and custom launch arguments one at a time.
A minimal reproduction tells you whether the blank follows the application, the spec, the bundler, the browser family, or the CI environment.
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10. Decision guide by symptom
| Symptom | Most likely cause | Action |
|---|---|---|
| Cypress reports that it cannot prepare the file | Spec/support compilation or dependency graph | Fix syntax, import paths, or missing dependencies; rerun. |
| CUT area is empty but runner controls work | Component index, dev server, support file, or mount setup | Read dev-server output and verify component.devServer, index, support imports, and providers. |
| DOM exists but appears white or unstyled | Missing CSS, root selector, or page-level setup | Inspect computed styles and import the required global CSS/providers. |
| Console shows an exception immediately after visit or mount | Application runtime error | Fix the thrown error; suppress only an intentionally asserted exception. |
| Browser closes or CDP times out | Process, policy, proxy, security software, memory, or GPU | Check policies and localhost access; try Electron or Chrome for Testing. |
| Only CI or headless mode is blank | Viewport, browser, or environment difference | Run headed, compare browsers and viewport, and inspect artifacts. |
| Failure starts after an install or update | Stale cache or changed browser binary | Clear the cache, run cypress info, and pin the browser. |
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FAQ
Why does the same spec pass in Electron but fail in Chrome?
That result isolates browser-family or managed-policy exposure; it does not prove the application is correct. Compare Console output, viewport, launch arguments, and enterprise policy, then reproduce with the browser used in CI.
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It indicates that mounting likely succeeded and the remaining problem is visual setup: imported CSS, root selectors, dimensions, theme variables, or other page-level providers.
Frequently Asked Questions
Why does the same spec pass in Electron but fail in Chrome?
That result isolates browser-family or managed-policy exposure; it does not prove the application is correct. Compare Console output, viewport, launch arguments, and enterprise policy, then reproduce with the browser used in CI.
What does a blank canvas with a populated DOM indicate?
It indicates that mounting likely succeeded and the remaining problem is visual setup: imported CSS, root selectors, dimensions, theme variables, or other page-level providers.
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