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LLM-generated CSS selectors require validation for web scraping

An attempt to use LLMs for generating CSS selectors for web scraping proved unreliable, with initial attempts failing 30-40% of the time. The solution involved first checking JSON-LD data and then validating each generated selector against the actual DOM before use. AI

IMPACT Highlights the need for validation layers when integrating LLM outputs into automated systems.

RANK_REASON The item describes a practical application and limitation of LLMs in a specific tooling context (web scraping CSS selectors).

Read on Mastodon — fosstodon.org →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

LLM-generated CSS selectors require validation for web scraping

COVERAGE [1]

  1. Mastodon — fosstodon.org TIER_1 English(EN) · [email protected] ·

    Turns out you can't just ask an LLM for CSS selectors and ship them. In our scraping system, first-attempt selectors returned nothing 30 to 40% of the time. The

    Turns out you can't just ask an LLM for CSS selectors and ship them. In our scraping system, first-attempt selectors returned nothing 30 to 40% of the time. The trick that made it work: check JSON-LD first, then run every generated selector through a validation loop against the r…