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To make Loki screenshots reliable for an Indian-language Storybook, load the intended script-specific font in Storybook’s preview iframe, wait until fonts and layout are ready before capture where necessary, and compare screenshots against reviewed reference images. The exact language, framework, and Loki version matter: use the matching font stack and verify commands against the versions in your project.
How Loki screenshot tests fit together
Loki compares captured Storybook stories with reference images. The core cycle is: initialize Loki, start Storybook, create references with loki update, run loki test, inspect differences, and update references only when a visual change is intentional.
Storybook renders stories in a preview iframe, also called Canvas, inside the larger application. Font styles loaded only in the manager UI may not reach that iframe. Add preview-specific font links and styles in .storybook/preview-head.html.
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Check prerequisites and versions
Start with the Loki and Storybook versions already installed in the repository. Loki’s getting-started documentation describes Node.js 16+ and recommends Chrome in Docker for web projects; local Chrome is also supported. Documentation can lag releases, so check the installed version and its available options before adopting commands or flags.
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The documented initialization flow is:
- Install Loki as a development dependency:
yarn add loki --dev. - Initialize it:
yarn loki init. Loki detects the project type and adds defaults topackage.json. - Start the Storybook server or serve its static build. Loki does not start Storybook for you.
For the web target, use the browser target supported by your project and CI environment. The examples below use Yarn because that is the package manager in Loki’s documented commands; adapt them if your repository uses another package manager.
Prepare stories and establish baselines
Choose representative language states
Add a small set of stories that reflects the interface you need to protect: actual product strings, representative punctuation and numerals, relevant text sizes, and layouts likely to wrap or expand. Use approved product copy. A few screenshots do not establish complete language coverage, so select cases based on the parts of the interface where text rendering and layout matter.
Create and review references
- Start Storybook in the way your project normally serves it.
- Capture initial references with
yarn loki update. - Run comparisons with
yarn loki test. - Inspect current screenshots and differences before accepting any update. Confirm that the expected script, font, shaping, line breaks, and layout appear correctly.
- Commit approved reference changes with the project. Loki stores current screenshots and differences in
loki/currentandloki/difference; Git LFS is an optional way to manage reference images.
Load the right font in the preview iframe
Put preview font links in .storybook/preview-head.html, rather than relying on styles that apply only to Storybook’s manager. For example, if your font files are served from a configured static directory, link the stylesheet there using the path appropriate to your project:
<link rel="stylesheet" href="/fonts/app-fonts.css">A preload link may make a local font available earlier, but preload alone does not prove that the intended family rendered. In the test browser, check that the stylesheet and font requests succeed and verify the rendered family. This is especially important when CSS fallback could make text appear plausible despite a missing preferred font.
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Choose a stack for the actual script
Use a font family designed for the writing system present in the story, then provide deliberate fallbacks. Noto’s documented Hindi sans-serif stack includes Noto Sans Devanagari, Noto Sans, Noto Sans Symbols 2, and a generic sans-serif. Its Tamil example includes Noto Sans Tamil as well. These are examples, not a universal stack for every Indian language: select the family and fallback order for your product’s language and design.
/* Example only: adapt to the language and font files your app uses. */
.language-hi {
font-family: "Noto Sans Devanagari", "Noto Sans", "Noto Sans Symbols 2", sans-serif;
}
.language-ta {
font-family: "Noto Sans Tamil", "Noto Sans", "Noto Sans Symbols 2", sans-serif;
}CSS tries later families when earlier ones lack the needed characters. That fallback behavior is useful for coverage, but can conceal a missing intended font. Make the test state and browser checks diagnostic enough to distinguish correct font loading from fallback rendering.
Wait for fonts before a custom capture
A screenshot taken before web fonts load may capture fallback text or a layout that changes after capture. The browser’s document.fonts.ready promise fulfills after loading and layout operations for used fonts are done. If custom code controls the capture timing, a readiness gate can be as simple as awaiting that promise in the page context:
await page.evaluate(() => document.fonts.ready);This is browser-level implementation guidance, not a documented universal Loki configuration key. Loki’s own loading behavior may handle many cases, but projects using external or asynchronous fonts should verify readiness in their actual browser target. If the installed Loki release does not offer a convenient hook for the gate you need, make the stories deterministic and ensure local font assets load before invoking Loki.
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Storybook’s test-runner documentation also describes waitForPageReady(page) before a screenshot; it waits for assets such as fonts. That is a Storybook test-runner pattern, not a Loki option. Do not assume that adding a wait to a separate test runner changes Loki’s capture behavior.
Run comparisons in CI
Loki’s documented static-build example builds Storybook and requires a reference for every comparison:
build-storybook && loki --requireReference --reactUri file:./storybook-staticThe --requireReference flag makes a missing baseline fail instead of silently creating one during CI. Confirm that the URI option matches your Storybook framework and installed Loki release. Keep browser target, viewport configuration, font assets, language content, and story state consistent between baseline creation and CI runs.
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Loki documents disabling common CSS transitions and animations and requestAnimationFrame by default. It also identifies limitations such as looping animation frames, GIFs, SVG animations, and React Native Animated. For stories that are unsuitable for capture, Loki supports loki: { skip: true }. For asynchronous stories that need to signal completion, its documentation provides a callback pattern.
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- Prefer local or deterministic data over changing network responses.
- Keep the browser target and viewport stable when comparing references.
- Do not approve a repeatable difference until you have checked the font, script shaping, text wrapping, and layout against the intended interface.
- If multiple browser or device targets matter to users, verify the correct font and layout on each target your product actually supports; do not assume a single target proves cross-browser behavior.
Troubleshooting common failures
Text appears as boxes or unexpected glyphs
Check whether the chosen font covers the story’s script, whether its CSS family is applied in the preview iframe, and whether the font request succeeds. Inspect the fallback chain: a generic fallback may render some characters while failing to match the intended design.
Text renders, but the screenshot has the wrong font or line breaks
Verify the computed family in the test browser and confirm the font has finished loading before capture. Check that the same font files, stylesheet paths, and viewport are used when creating and comparing references.
CI fails because it cannot find a reference
That is the expected result when --requireReference is enabled and the baseline is absent. Create and review the reference in the appropriate workflow, then commit it; do not turn off the check merely to make CI pass.
Captures differ on every run
Check for asynchronous story state, remote data, animations, and changing assets. Use deterministic data and an appropriate completion signal for asynchronous stories. Skip stories that cannot yield a meaningful stable capture rather than accepting arbitrary differences.
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A Loki command or option is rejected
Compare the command with the installed Loki release and your Storybook framework. Loki’s getting-started and CI documentation examples may not match every current project configuration; use the option names supported by your installed version.
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Sources and version notes
- Loki: Getting started describes initialization, browser targets, reference updates, and tests.
- Loki: Continuous integration documents the static-build pattern and requiring references.
- Loki: Configuration covers configuration and story behavior.
- Storybook: Story rendering explains the preview iframe and its head configuration.
- Storybook: Test runner documents page readiness helpers.
- Google Fonts: Noto provides script-specific font guidance.
- MDN: Document.fonts describes the browser font readiness promise.
The examples are adaptable guidance, not a tested recipe for a particular language, typeface, framework, or version. Confirm commands and configuration against your repository and installed releases.
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