WeasyPrint 70.0 is the clearest documented choice if CSS custom properties are essential: its current stable API reference explicitly confirms support for custom properties and var(). DocRaptor using Prince 13, Pipeline 8 is another documented option, but that support was announced in 2020 and you must verify that your account or API request uses the relevant pipeline. Neither feature claim guarantees that an entire browser-oriented stylesheet will render as intended.
What to use if CSS variables must appear in the PDF
Start with WeasyPrint 70.0 when you want a currently documented, explicit statement of CSS custom-property support. Its API reference says custom properties and var() notation are supported: WeasyPrint stable API reference.
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DocRaptor is a second documented choice when its Prince 13 Pipeline 8 is selected. DocRaptor’s release note dated October 21, 2020, says Prince 13 added support for CSS variables and explains that the pipeline must be selected; existing users were advised to test and upgrade rather than assume automatic migration: DocRaptor’s Prince 13 release note.
| Converter | What is documented | What to verify |
|---|---|---|
| WeasyPrint 70.0 | Its current stable API reference explicitly confirms custom properties and var(). |
Test the rest of your stylesheet: the same documentation describes limits in areas including right-to-left/bidirectional text and aspects of flexbox and grid. |
| DocRaptor with Prince 13 / Pipeline 8 | DocRaptor’s October 21, 2020 release note says Prince 13 introduced CSS-variable support in Pipeline 8. | Confirm the pipeline selected for your account or API requests. Do not assume an existing integration uses it. |
| Prince | The official Prince 15 guide describes HTML/XML-to-PDF conversion using CSS. | The guide excerpt does not independently establish which Prince version introduced custom-property support. Use DocRaptor’s dated note for the Prince 13 claim. |
| PDFreactor 12.7.1 | The reviewed manual documents HTML5 parsing, HTML-and-CSS rendering, and configurable CSS validation/support-query behavior. | The reviewed material does not explicitly verify custom-property support. Check the relevant current support entry or test it; do not infer support from general CSS rendering. |
Sources: Prince 15 user guide and PDFreactor manual.
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How CSS variables work—and what a converter must support
CSS custom properties are commonly declared with names such as --brand-color and used through var(--brand-color). They participate in the cascade and can inherit. A fallback such as var(--brand-color, #2457a7) supplies a value when the property is missing or invalid in an implementation that supports custom properties. A fallback does not make an unsupported renderer understand var(). See MDN’s guide to using custom properties.
For example, this is a useful minimal check, not proof that a complex production layout will work:
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:root {
--brand-color: #2457a7;
}
h1 {
color: var(--brand-color, #333333);
}Test the actual template with its real variable scopes and fallback patterns. Also include linked stylesheets, fonts, print-media rules, page breaks, and the layout features the document depends on. This is a practical compatibility check, not a cross-product benchmark: the sources cited here do not establish comparative rendering results.
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Choose WeasyPrint when explicit current documentation matters
WeasyPrint 70.0 has the most direct current documentation for the specific requirement in this comparison: its stable API reference expressly names custom properties and var(). Treat that as a feature-level confirmation, not a promise of browser-equivalent output. Check its current feature documentation against your use of grid, flexbox, text direction, fonts, and other layout behavior.
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Choose DocRaptor only after confirming its pipeline
DocRaptor’s Prince 13 / Pipeline 8 announcement is specific and useful, but dated. Verify the engine pipeline in the current account configuration or API request, and render a representative document before switching production traffic. The release note says existing users needed to test and upgrade; the feature should not be assumed for every DocRaptor job.
Keep Prince and PDFreactor claims within what is documented
The Prince 15 guide establishes that Prince converts HTML and XML to PDF with CSS, but the reviewed guide excerpt does not independently date its custom-property support. The reviewed PDFreactor 12.7.1 manual establishes HTML5 and CSS rendering and configurable validation/support queries, but does not explicitly confirm custom properties. For either, consult the current feature entry or run a focused test before relying on variables.
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Compare operational fit separately
Variable support is only one selection criterion. Establish whether you need a local renderer or hosted service, which runtime and integration model fit your system, and whether your security and scale requirements are met. The material cited here does not establish a comprehensive current price or performance comparison, so obtain those details from vendors rather than inferring them.
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Validate the PDF before deployment
- Pin the renderer and configuration. Record the exact WeasyPrint version or, for DocRaptor, the selected Prince pipeline. This makes later rendering differences diagnosable.
- Build a representative fixture. Include inherited and locally scoped custom properties, missing-variable fallbacks, linked CSS and fonts, print rules, page breaks, and production layout features.
- Render and inspect the PDF. Check not only whether the variable-driven color or value appears, but also pagination, font loading, directionality, and layout.
- Test changes before rollout. Re-render the same fixture after an engine or template change and compare the output against the expected result.
Why CSS variables may be missing from a PDF
- The renderer does not implement custom properties. A
var()fallback only helps when the implementation supports custom properties; it cannot add support to an incompatible engine. - The property is unavailable in the relevant cascade or inheritance scope. Check where the
--nameis declared and whether the element usingvar(--name)inherits it. MDN documents the cascade, inheritance, and fallback behavior in its custom properties guide. - The expected DocRaptor pipeline is not active. Verify the configured pipeline rather than assuming an existing account or request was upgraded.
- A different part of the stylesheet is unsupported or behaves differently in print output. Isolate the variable test, then check the renderer’s feature documentation for the grid, flexbox, text-direction, font, or pagination behavior your document uses.
Or skip the browser setup
ScreenshotNeo is a screenshot API, not an HTML-to-PDF renderer, so it is an alternative when the deliverable can be a webpage screenshot rather than a paginated PDF. A single request captures a URL as PNG, JPEG, WebP, or PDF. For PDF work that specifically depends on CSS-variable fidelity, keep using a PDF renderer and validate the output as described above.
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Frequently Asked Questions
Does a fallback in var() make a CSS-variable-incompatible converter work?
No. A fallback provides a value only in an implementation that supports custom properties; it does not add that feature to an incompatible renderer.
Is ScreenshotNeo a direct replacement for an HTML-to-PDF converter?
Not when you need a paginated PDF whose output depends on CSS custom properties. ScreenshotNeo is useful when a screenshot or URL-to-PDF capture meets the need; it does not replace validation in a dedicated PDF renderer.
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