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ProductWebBench: Evaluating Website Continuity Beyond Task Completion

Jiajun Wu, Jian Yang, Yaxin Du, Shukai Liu, Linzheng Chai, Tuney Zheng, Wei Zhang, Haitao Yang · 2026 · arXiv

DOI: 10.48550/arXiv.2610.31118 · open-access PDF

Spanish

Los agentes de codificación frontend generalmente se clasifican en una pregunta: ¿se ha construido el objetivo solicitado? Los cambios de ingeniería reales tienen una segunda obligación, porque el resto del sitio tiene que seguir trabajando. Llamamos a esa segunda obligación continuidad del sitio web, e introducimos ProductWebBench, un índice que marca tanto en los repositorios frontend vivos: 320 Tareas de cambio sobre el código existente y 80 tareas de construcción de horizonte largo. Cada tarea congela una imagen instantánea del repositorio, requisitos de etapa, pruebas del navegador y comprobaciones deterministas antes de la evaluación, y solo entra una vez que una referencia pasa cada cheque y plausible-

Machine translation (Meta M2M100); the English original follows.

Abstract

Frontend coding agents are usually graded on one question: did the requested target get built. Real engineering changes carry a second obligation, because the rest of the site has to keep working. We call that second obligation website continuity, and introduce ProductWebBench, a benchmark that scores both on living frontend repositories: 320 Change tasks over existing code and 80 long-horizon Build tasks. Every task freezes a repository snapshot, staged requirements, browser evidence and deterministic checks before evaluation, and enters only once a reference passes every check and plausible-

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