If Playwright screenshots fail because a web font loads too late, wait for the page’s used fonts before the assertion. If a specific face or set of glyphs is required, explicitly load it and let the test fail if that load fails. Then verify that the intended font—not a fallback—is rendering, and compare screenshots in consistent browser and operating-system environments.
Wait for fonts before taking the screenshot
After navigation, await the document’s font readiness promise before running the visual assertion:
await page.goto('/page-under-test');
await page.evaluate(() => document.fonts.ready);
await expect(page).toHaveScreenshot();document.fonts.ready fulfills when loading and layout operations for the document’s fonts in use are complete. It does not guarantee that every font declared in CSS has loaded: faces the page does not use may remain unloaded. See MDN’s documentation for Document.fonts.
Wait after the content that matters has appeared. If a click, route change, or other UI action introduces text that uses another face, wait again after that action:
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await page.goto('/page-under-test');
await page.getByRole('button', { name: 'Show receipt' }).click();
await page.evaluate(() => document.fonts.ready);
await expect(page).toHaveScreenshot();Use the actual control and accessible name from your page. The important order is: make the screenshot content visible, wait for its fonts, then capture.
Explicitly load a required font when readiness is not enough
If the screenshot depends on a particular face or glyph set, request it directly with document.fonts.load(). Pass a CSS font shorthand and representative text that appears in the capture:
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await page.evaluate(async () => {
await document.fonts.load('16px "Brand Sans"', 'Checkout total');
});
await page.evaluate(() => document.fonts.ready);
await expect(page).toHaveScreenshot();FontFaceSet.load() forces matching faces to load and returns a promise that rejects if a font fails. The representative text helps select faces covering the characters you intend to render. See MDN’s FontFaceSet.load() reference. If the test’s text includes different scripts, symbols, or weights, use representative text and a CSS shorthand that match those screenshot requirements.
Explicit loading is especially useful when ordinary visible text does not trigger the face needed by the screenshot, or when a missing required font should be a clear test failure rather than a subtle visual difference.
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Diagnose whether the font is late, missing, or simply different
Use the actual, expected, and diff images to classify the failure before changing assertion tolerances. Playwright’s Trace Viewer can help review screenshot comparisons and the captured page state.
- Check for a timing race. Add
document.fonts.readyafter navigation and after actions that reveal new text, then rerun the test. - Check a required face directly. Call
document.fonts.load()with the intended shorthand and representative screenshot text. A rejected promise indicates that the requested font load failed. - Investigate delivery and declarations if loading fails. Inspect the font URL and its response, the relevant
@font-facefamily, weight, and style declarations, and browser console or network errors. This is a practical next step when an explicit font load rejects; the exact cause depends on the application. - Verify the intended face is available. A fallback can render successfully and still make the image differ. Do not treat
document.fonts.check()by itself as proof that a named custom family exists or loaded. MDN explains that it can return true when that family is absent from the font set because no unloaded face from that set is needed to render. See the MDN content source for FontFaceSet.check(). - Compare the rendering environments. Keep browser version, operating system, browser settings, hardware, power source, and headless mode consistent where practical. Playwright identifies these as potential sources of rendering variation; separate baselines may be appropriate for intentionally different browser or platform projects. See Playwright’s visual comparison guidance.
- Adjust pixel tolerance only after those checks. A threshold can permit small rendering differences, but it does not make a missing or late font load correctly.
Why screenshot stabilization alone may not fix a font race
Playwright’s toHaveScreenshot() assertion retries until consecutive screenshots match, then compares the result with the baseline. Its documentation describes visual stabilization, not a guarantee that web fonts are ready. When a font timing race is suspected, add the font-specific wait before the assertion. See Playwright’s PageAssertions reference.
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A generic networkidle wait is not a better substitute: Playwright discourages using it as a testing readiness criterion and recommends web assertions. A font-specific promise directly addresses font readiness, while an arbitrary fixed delay merely waits for a guessed duration. See the Playwright Page API.
Troubleshoot common font screenshot failures
| Symptom | Likely issue | What to do |
|---|---|---|
| Screenshot text has different widths or wraps differently from the baseline. | The intended face may not be ready, or a fallback may be rendering. | Wait for document.fonts.ready after the relevant content appears. If the face is required, explicitly call document.fonts.load() and inspect its result. |
| The explicit font-load promise rejects. | The matching face could not be loaded. | Inspect the font URL response, @font-face family/weight/style declarations, and browser console or network errors. |
document.fonts.check() returns true, but the screenshot still uses a fallback. |
The check is not proof that the named family exists or was loaded. | Use an explicit load for the required face and representative text; verify delivery and declarations. |
| The screenshot still differs after fonts are ready. | The difference may come from browser, OS, settings, or other rendering variation rather than font timing. | Compare baseline and test environments, then use baselines suited to intentionally different projects. |
| Increasing the screenshot threshold makes the test pass, but text still looks wrong. | The assertion tolerance is masking a real font or environment problem. | Confirm the intended font and comparable rendering environment before tuning thresholds. |
A fixed timeout or networkidle wait is unreliable. |
Neither establishes that the particular font needed by the screenshot is ready. | Use document.fonts.ready or, for a specific required face, document.fonts.load(). |
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Frequently Asked Questions
Does `document.fonts.ready` load every font declared in the stylesheet?
No. It waits for loading and layout operations for fonts used by the document; unused declared faces may remain unloaded.
Does `toHaveScreenshot()` guarantee that web fonts have loaded?
Its documentation describes waiting for consecutive screenshots to stabilize, not a font-readiness guarantee. Add a font-specific wait when font timing is at issue.
Should I use `networkidle` or a fixed timeout to wait for fonts?
Neither is a font-specific readiness signal. Use `document.fonts.ready`, or explicitly load a required face with `document.fonts.load()`.
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