ReflowPDF has released its CSS conformance test results, reporting a 94.62% pass rate across the Web Platform Tests suite for its browser-less HTML-to-PDF engine. The company published detailed breakdowns by CSS specification and property to provide transparency into its rendering capabilities.
The publication of these results addresses a long-standing lack of standardized performance metrics for HTML-to-PDF engines, which have largely relied on outdated Acid2 markers or private feature lists. By adopting the Web Platform Tests used by major browsers, ReflowPDF provides engineers with a verifiable baseline for layout fidelity in document generation. This move pressures competitors like Prince and PDFreactor to move beyond static feature checklists toward automated, transparent conformance reporting. As streaming professionals increasingly automate high-fidelity reporting and billing documents, these metrics offer a technical safeguard against rendering regressions. Watch for whether other document-generation vendors adopt similar open-source test suites to validate their CSS implementations.
ReflowPDF has published CSS conformance results for its browser-less HTML-to-PDF engine, achieving a 94.62% pass rate across the Web Platform Tests suite. By adopting these standardized metrics, the company provides engineers with a verifiable baseline for layout fidelity, pressuring competitors to move toward more transparent, automated reporting for document generation.
The ReflowPDF engine achieved a 94.62% mean score across 29,309 tests, with 27,565 files passing every subtest.
Approximately 1,487 files were excluded from the primary score because the engine lacks a JavaScript runtime, which is required for those specific tests.
Internal testing for paged media, which includes features like footnotes and running headers, achieved a 100% pass rate across 106 reftests.
These results provide a standardized, verifiable baseline for layout fidelity, replacing outdated markers and pressuring competitors to adopt transparent, automated conformance reporting.
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