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Master HTML5 semantic markup and CSS layouts (Flexbox, Grid). Learn responsive design and accessibility best practices for modern web development.

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1Download skill
2Enable skills in Claude

Open claude.ai/settings/capabilities and find the "Skills" section

3Upload to Claude

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SKILL.md

name html-css-essentials
description Master HTML5 semantic markup and CSS layouts (Flexbox, Grid). Learn responsive design and accessibility best practices for modern web development.

HTML & CSS Essentials

Master the foundational markup and styling languages that power the web. HTML5 provides semantic structure, CSS creates visual design and responsive layouts.

Learning Objectives

  • Create semantically correct HTML documents
  • Master CSS layout techniques (Flexbox, Grid)
  • Build responsive designs
  • Apply accessibility best practices
  • Optimize styling performance

Key Topics

HTML5 Semantic Markup

  • Document structure (<!DOCTYPE>, <html>, <head>, <body>)
  • Semantic elements (<header>, <nav>, <main>, <article>, <footer>)
  • Forms and inputs with validation
  • Accessibility attributes (ARIA, alt text)
  • Data attributes and custom elements

CSS Fundamentals

  • Selectors and specificity
  • Box model and display properties
  • Units (px, em, rem, %, vw, vh)
  • Colors and gradients
  • Typography and fonts

Responsive Design

  • Mobile-first approach
  • Media queries and breakpoints
  • Flexible layouts
  • Responsive images
  • Touch-friendly interfaces

CSS Layouts

  • Flexbox: Flexible box model for 1D layouts
  • CSS Grid: 2D grid layouts
  • Positioning: Static, relative, absolute, fixed, sticky
  • Modern layout tricks: Subgrid, aspect-ratio

Resources


Status: Active | Version: 1.0.0