Alanamultiskillagent
Back to skills

core-web-vitals

testing

Diagnoses and fixes Core Web Vitals issues across LCP, INP, and CLS. Covers image preloading, main thread optimization, layout shift prevention, and field measurement with the web-vitals library. Incl

addyosmaniaddyosmani
|View all addyosmani skills →

Setup & Installation

npx skills add https://github.com/addyosmani/core-web-vitals --skill core-web-vitals
or paste the link and ask your coding assistant to install it
https://github.com/addyosmani/core-web-vitals
View on GitHub

What This Skill Does

Diagnoses and fixes Core Web Vitals issues across LCP, INP, and CLS. Covers image preloading, main thread optimization, layout shift prevention, and field measurement with the web-vitals library. Includes framework-specific patterns for Next.js, React, and Vue. Lighthouse tells you a metric is bad but not which element or line to fix, this skill maps each metric to the actual code patterns that cause regressions.

When to use it

  • Working with core web vitals functionality
  • Implementing core web vitals features
  • Debugging core web vitals related issues

Similar Skills

azure-microsoft-playwright-testing-ts

Runs Playwright tests on cloud-hosted browsers through Azure Playwright Workspaces. Handles parallel test execution across up to 20+ workers, publishes results to the Azure portal, and integrates with

azure-resource-manager-playwright-dotnet

Management plane SDK for Azure's Microsoft Playwright Testing service, written for .NET. Handles workspace provisioning, quota inspection, and name availability checks via Azure Resource Manager. Does

benchmark

Measures web page performance by collecting real PerformanceAPI data from a running browser session. Captures metric baselines before changes, then compares TTFB, FCP, LCP, bundle sizes, and request c

browse

A headless Chromium controller for testing and verifying web apps. Supports navigation, form interaction, element state checks, responsive screenshots, file uploads, and diff comparisons. Runs at roug