Hi!

Welcome to this space where I share learnings about different topics related to the Front-end world, especially Web Performance.

Recent Posts

• WebMCP on a static site: the GeeksCAT Conf 2026 website, ready for agents

  Published:16 Sept 2026

  The GeeksCAT Conf 2026 website is a static Astro site that exposes its schedule, speakers and event details to AI agents through WebMCP. Three layers: a manifest in /.well-known, JSON endpoints generated at build time, and tool registration with document.modelContext.

• HTTP cache partitioning: the same image, downloaded twice

  Published:25 Aug 2026

  A page with a cross-site iframe requests the same image from the iframe and from the parent. Chrome downloads it twice; Firefox and Safari, once. Why the cache key differs across the three engines, why sharing a partition does not guarantee a hit, and what Cross-Origin Storage proposes to fix it.

• A skill that knows nothing: the architecture of Modern Web Guidance

  Published:13 Aug 2026

  Modern Web Guidance doesn't keep the knowledge in the skill, it teaches the agent to retrieve it. Local semantic search with MiniLM and TensorFlow.js, guides with their own grader, and empirical calibration of the content.

• The CrUX 28-day rolling window

  Published:11 Aug 2026

  How the CrUX 28-day rolling window actually works, what each source publishes, and why p75 takes so long to move even though the data is only two days old.