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Why Playwright screenshots can show a different font
Playwright does not independently choose a CSS font. The browser applies the page’s styles and renders with the fonts available to it. A font can therefore look wrong because the intended font is absent from the runtime, a web font has not loaded when the screenshot is taken, or the screenshot and baseline were rendered in different environments.
Playwright notes that screenshot rendering can vary with the host operating system, browser version, settings, hardware, power source, and headless mode. Fonts are among the sources of visual differences across browsers and platforms. These factors make a local-versus-CI mismatch a reason to compare environments, not proof that the page’s CSS changed. See Playwright’s visual comparisons guidance.
Diagnose the failing run before changing settings
Record the environment
Write down the Playwright package version, browser project, headless or headed mode, operating system or container image, and whether the failure occurs locally, in CI, or in both. Compare the failing run with the environment that generated the expected screenshot. This narrows the investigation: a container-only failure points toward the runtime image or its fonts, while a failure that follows a page change may point toward styles or font loading.
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Check the page’s font declaration and fallback chain
Inspect the relevant CSS font-family rule and identify the intended font and its fallback fonts. Check that any custom web-font files are served successfully and that the screenshot is not captured while the page is still using a fallback. In the browser, inspect the affected element’s computed styles and font/network diagnostics as debugging steps; a computed font-family declaration alone does not prove that the named font was available and rendered.
Check the actual Linux or container runtime
When the issue appears only in Linux, Docker, or CI, investigate fonts in the image where Playwright launches the browser—not just fonts installed on a developer’s workstation. Confirm whether the image contains the required family and whether the browser can use it. The required font may be application-specific, so there is no single package that fixes every project.
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Install browser dependencies when the Linux runtime needs them
Playwright documents installing Chromium and its system dependencies together with:
npx playwright install --with-deps chromiumUse the corresponding browser argument if the project runs Firefox or WebKit. This installs browser dependencies; do not assume it supplies every font your application needs, especially proprietary or application-specific fonts. Identify and install the required font separately when it is missing, following the rules that apply to that font and the base distribution.
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Pin Docker image and package versions together
Playwright’s Docker documentation says its image includes browser binaries and system dependencies, while the Playwright package must still be installed in the project. Keep the image version aligned with the project’s Playwright version: a mismatch can stop Playwright from locating browser executables. Check the documentation and tag for the version you actually use rather than copying a version-specific tag from an example. The Docker guidance cited here is on Playwright’s Docker page.
Make web-font loading part of page readiness
Wait for the application state and content needed by the screenshot. If the page uses a remote or locally served web font, verify in the running application that the font request succeeds and the intended typeface is ready before capture. Browser APIs can help with font readiness, but confirm their current behavior against browser documentation and your application; do not treat screenshot stabilization as proof that the font loaded.
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Playwright’s toHaveScreenshot() assertion waits for two consecutive screenshots to match before comparing the final image. That can help with transient visual changes, but it cannot install a missing font or make two different host environments equivalent. See the PageAssertions documentation. The Page API documentation describes screenshot capture options.
Keep visual baselines reproducible
Generate and compare screenshots in the same operating-system and browser environment where practical; Playwright recommends using the environment in which the baseline was generated. If the project deliberately tests multiple platforms or browsers, maintain separate baselines for those combinations instead of expecting identical font rasterization. This makes a genuine rendering change easier to distinguish from an environment mismatch.
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| Approach | When it fits | Trade-off |
|---|---|---|
| Use a pinned container image for baseline generation and comparison | You want repeatable browser and dependency versions across developer and CI runs. | The image and project package must be kept in sync, and required application fonts still need to be present. |
| Use a host-managed runner | The host environment is intentional and you can keep its browser and font setup consistent. | Host changes can introduce rendering differences; record and control the environment. |
| Keep one canonical OS/browser baseline | You need a single agreed rendering target. | It does not represent every platform your users may use. |
| Maintain per-platform or per-browser baselines | Cross-platform rendering is part of what the tests need to cover. | More baselines require more maintenance and should be reviewed for the environment they represent. |
| Use an application-served web font | The intended font should travel with the application rather than depend on a machine’s installed fonts. | Font loading must be ready before capture, and licensing or redistribution terms still apply. |
| Use a locally installed font | The runtime is controlled and the font can be installed there appropriately. | Every relevant runtime must have the correct font; licensing or redistribution constraints may apply. |
Tune screenshot comparisons only after fixing the font
Once the intended font is available, loaded, and rendered in the same environment as the baseline, investigate legitimate rendering changes and screenshot assertion options. Playwright supports comparison options and styling to suppress volatile elements. Adjusting pixel thresholds before checking font availability can mask the symptom rather than resolve it.
Troubleshoot common failure patterns
- It fails only in Docker or Linux CI: inspect fonts and browser dependencies inside the actual image. Install the required font if it is absent; browser dependency installation is not a guarantee that every application font is included.
- It fails only in CI, but the font is present: compare the CI image, operating system, browser, Playwright version, and headless mode with the baseline-generation environment. Align them or maintain a baseline for the intended CI environment.
- The screenshot sometimes uses the fallback font: check whether the font request succeeds and whether capture happens before the page is ready. Add an application-level readiness condition appropriate to the page, then verify it in the failing runtime.
- The CSS names the right family, but the text still looks different: confirm the font is actually available to the browser and inspect the font request and rendered result. A CSS declaration can name a font that the runtime cannot use.
- Playwright cannot locate a browser executable after a Docker change: check that the Docker image tag matches the project’s Playwright version, and install the Playwright package in the project as required.
- Raising the diff threshold makes the test pass: first verify font availability, font readiness, and environment consistency. A wider threshold may hide a font substitution or rasterization mismatch.
Or skip the browser setup
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Frequently Asked Questions
Does screenshot stabilization guarantee the web font has loaded?
No. It can wait for consecutive captures to match, but verify font loading and page readiness separately.
Should visual baselines match across operating systems?
Not necessarily. For cross-platform testing, use baselines for the relevant platform and browser combinations.
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