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更新日2026年1月14日 21:00

Write semantic, accessible, performant HTML with modern best practices. Use when asked to (1) create HTML pages or documents, (2) write semantic markup, (3) improve accessibility, (4) optimize HTML structure and performance, (5) implement forms, tables, or complex layouts, or when phrases like "HTML page", "web page", "markup", "semantic HTML", "accessibility" appear.

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jaredlander

jaredlander/freshbooks-speed

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Expert HTML Development

Write clean, semantic, accessible HTML that follows modern web standards and best practices.

MCP Integration - Context7

CRITICAL: Before writing or editing ANY HTML code, ALWAYS use the Context7 MCP server to check for relevant context.

Context7 provides access to a knowledge base that may contain:

Project-specific HTML patterns and conventions
Custom component libraries and templates
Style guide requirements
Accessibility standards for the project
Performance benchmarks and requirements
Team preferences and coding standards

Workflow:

Before writing code: Query Context7 for relevant patterns, conventions, or examples
During editing: Check Context7 for project-specific requirements that might affect your changes
After writing: Verify your code aligns with any Context7 guidance

Use Context7 to search for topics like:

"HTML conventions"
"accessibility requirements"
"component templates"
"form patterns"
"performance standards"
Specific component or pattern names

Never skip the Context7 check - it ensures your HTML aligns with project standards and leverages existing patterns.

Core Principles

Semantic first - Use elements for their intended meaning, not just appearance
Accessibility by default - Every user deserves a great experience
Progressive enhancement - Start with working HTML, layer on CSS/JS
Performance matters - Optimize for speed and efficiency

Document Structure

Minimal Valid HTML5 Document

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Page Title - Site Name</title>
  <meta name="description" content="Clear, concise page description (150-160 chars)">
  <link rel="stylesheet" href="styles.css">
</head>
<body>
  <header>
    <nav aria-label="Main navigation">
      <!-- Navigation -->
    </nav>
  </header>
  
  <main>
    <!-- Primary content -->
  </main>
  
  <footer>
    <!-- Footer content -->
  </footer>
  
  <script src="script.js" defer></script>
</body>
</html>

Essential Meta Tags

<head>
  <!-- Character encoding (must be first) -->
  <meta charset="UTF-8">
  
  <!-- Viewport for responsive design -->
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  
  <!-- SEO basics -->
  <title>Specific, Descriptive Title | Brand</title>
  <meta name="description" content="Clear description for search results">
  <link rel="canonical" href="https://example.com/page">
  
  <!-- Open Graph for social sharing -->
  <meta property="og:title" content="Title for Social Media">
  <meta property="og:description" content="Description for social cards">
  <meta property="og:image" content="https://example.com/image.jpg">
  <meta property="og:url" content="https://example.com/page">
  <meta property="og:type" content="website">
  
  <!-- Twitter Card -->
  <meta name="twitter:card" content="summary_large_image">
  <meta name="twitter:title" content="Title for Twitter">
  <meta name="twitter:description" content="Description for Twitter">
  <meta name="twitter:image" content="https://example.com/image.jpg">
  
  <!-- Favicon (use multiple sizes for best support) -->
  <link rel="icon" type="image/svg+xml" href="/favicon.svg">
  <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
  <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
  
  <!-- Preload critical resources -->
  <link rel="preload" href="critical-font.woff2" as="font" type="font/woff2" crossorigin>
  
  <!-- Theme color for browser UI -->
  <meta name="theme-color" content="#000000" media="(prefers-color-scheme: dark)">
  <meta name="theme-color" content="#ffffff" media="(prefers-color-scheme: light)">
</head>

Semantic HTML Elements

Use the Right Element for the Job

<!-- ❌ Generic divs for everything -->
<div class="header">
  <div class="nav">
    <div class="nav-item">Home</div>
  </div>
</div>
<div class="content">
  <div class="article">
    <div class="title">Article Title</div>
    <div class="text">Article content...</div>
  </div>
</div>

<!-- ✅ Semantic elements with clear meaning -->
<header>
  <nav aria-label="Main navigation">
    <a href="/">Home</a>
  </nav>
</header>
<main>
  <article>
    <h1>Article Title</h1>
    <p>Article content...</p>
  </article>
</main>

Sectioning Elements

Element	Purpose	When to Use
`<header>`	Introductory content	Site/section header, not just "top of page"
`<nav>`	Navigation links	Primary navigation, table of contents, breadcrumbs
`<main>`	Primary content	One per page, skips to main content
`<article>`	Self-contained content	Blog posts, news items, forum posts
`<section>`	Thematic grouping	Chapters, tabs, themed sections (always has heading)
`<aside>`	Tangentially related	Sidebars, pull quotes, related links
`<footer>`	Footer content	Site/section footer, not just "bottom of page"

Heading Hierarchy

<!-- ✅ Logical hierarchy (never skip levels) -->
<h1>Page Title</h1>
  <h2>Main Section</h2>
    <h3>Subsection</h3>
    <h3>Another Subsection</h3>
  <h2>Another Main Section</h2>

<!-- ❌ Bad: skipping levels -->
<h1>Page Title</h1>
  <h4>Skipped h2 and h3</h4>

Accessibility Best Practices

ARIA Labels and Roles

<!-- Landmark labels for navigation -->
<nav aria-label="Main navigation">
  <ul>
    <li><a href="/">Home</a></li>
  </ul>
</nav>

<nav aria-label="Footer navigation">
  <!-- Footer links -->
</nav>

<!-- Button with accessible name -->
<button aria-label="Close dialog">
  <svg aria-hidden="true"><!-- X icon --></svg>
</button>

<!-- Hide decorative content from screen readers -->
<img src="decorative.png" alt="" role="presentation">
<span aria-hidden="true">📧</span>

<!-- Associate labels with inputs -->
<label for="email">Email Address</label>
<input type="email" id="email" name="email" required>

<!-- Or wrap inputs in labels -->
<label>
  Email Address
  <input type="email" name="email" required>
</label>

Focus Management

<!-- Skip to main content link (first interactive element) -->
<a href="#main" class="skip-link">Skip to main content</a>

<main id="main" tabindex="-1">
  <!-- Content -->
</main>

<!-- Ensure custom interactive elements are keyboard accessible -->
<div role="button" tabindex="0" onclick="handleClick()" onkeydown="handleKeyPress(event)">
  Custom Button
</div>

Alternative Text

<!-- ✅ Descriptive alt text -->
<img src="chart.png" alt="Bar chart showing 40% increase in sales from Q1 to Q2 2024">

<!-- ✅ Empty alt for decorative images -->
<img src="decorative-border.png" alt="">

<!-- ✅ Complex images with long descriptions -->
<img src="complex-diagram.png" alt="Network topology diagram" aria-describedby="diagram-desc">
<div id="diagram-desc">
  Detailed description of the network topology showing...
</div>

<!-- ❌ Bad alt text -->
<img src="chart.png" alt="image">
<img src="chart.png" alt="chart.png">

ARIA Live Regions

<!-- Announce dynamic content updates -->
<div role="status" aria-live="polite" aria-atomic="true">
  <span id="status-message">Loading...</span>
</div>

<!-- Alert for critical messages -->
<div role="alert" aria-live="assertive">
  Error: Please correct the form errors below.
</div>

Forms

Accessible Form Structure

<form method="post" action="/submit" novalidate>
  <fieldset>
    <legend>Personal Information</legend>
    
    <!-- Text input with validation -->
    <label for="name">Full Name</label>
    <input 
      type="text" 
      id="name" 
      name="name" 
      required 
      aria-required="true"
      aria-describedby="name-hint"
      autocomplete="name"
    >
    <small id="name-hint">Enter your first and last name</small>
    
    <!-- Email with pattern validation -->
    <label for="email">Email</label>
    <input 
      type="email" 
      id="email" 
      name="email" 
      required
      aria-required="true"
      autocomplete="email"
      aria-invalid="false"
    >
    <span id="email-error" class="error" role="alert"></span>
    
    <!-- Select with grouped options -->
    <label for="country">Country</label>
    <select id="country" name="country" required>
      <option value="">Select a country</option>
      <optgroup label="North America">
        <option value="us">United States</option>
        <option value="ca">Canada</option>
      </optgroup>
      <optgroup label="Europe">
        <option value="uk">United Kingdom</option>
        <option value="de">Germany</option>
      </optgroup>
    </select>
    
    <!-- Radio buttons (same name groups them) -->
    <fieldset>
      <legend>Preferred Contact Method</legend>
      <label>
        <input type="radio" name="contact" value="email" checked>
        Email
      </label>
      <label>
        <input type="radio" name="contact" value="phone">
        Phone
      </label>
    </fieldset>
    
    <!-- Checkboxes for multiple selection -->
    <fieldset>
      <legend>Newsletter Subscriptions</legend>
      <label>
        <input type="checkbox" name="newsletters" value="weekly">
        Weekly Updates
      </label>
      <label>
        <input type="checkbox" name="newsletters" value="monthly">
        Monthly Digest
      </label>
    </fieldset>
    
    <!-- Textarea with character counter -->
    <label for="message">Message</label>
    <textarea 
      id="message" 
      name="message" 
      rows="5" 
      maxlength="500"
      aria-describedby="char-count"
    ></textarea>
    <small id="char-count">0 / 500 characters</small>
  </fieldset>
  
  <button type="submit">Submit Form</button>
  <button type="reset">Clear Form</button>
</form>

HTML5 Input Types

<!-- Use specific input types for better UX and validation -->
<input type="email" name="email" autocomplete="email">
<input type="tel" name="phone" autocomplete="tel">
<input type="url" name="website">
<input type="number" name="quantity" min="1" max="100" step="1">
<input type="range" name="volume" min="0" max="100" value="50">
<input type="date" name="dob" autocomplete="bday">
<input type="time" name="appointment">
<input type="datetime-local" name="event-time">
<input type="color" name="theme-color" value="#000000">
<input type="file" name="upload" accept="image/*,.pdf" multiple>
<input type="search" name="query" autocomplete="off">

Input Attributes for Better UX

<!-- Autocomplete for faster input -->
<input type="text" name="given-name" autocomplete="given-name">
<input type="text" name="family-name" autocomplete="family-name">
<input type="text" name="address-line1" autocomplete="address-line1">
<input type="text" name="postal-code" autocomplete="postal-code">

<!-- Pattern validation with custom message -->
<input 
  type="text" 
  name="username" 
  pattern="[a-zA-Z0-9_]{3,16}"
  title="Username must be 3-16 characters, letters, numbers, and underscores only"
>

<!-- Autofocus (use sparingly, only once per page) -->
<input type="text" name="search" autofocus>

<!-- Input mode for mobile keyboards -->
<input type="text" inputmode="numeric" name="credit-card">
<input type="text" inputmode="decimal" name="price">
<input type="text" inputmode="email" name="email">

Tables

Accessible Data Tables

<!-- Simple table with headers -->
<table>
  <caption>Quarterly Sales Report for 2024</caption>
  <thead>
    <tr>
      <th scope="col">Quarter</th>
      <th scope="col">Revenue</th>
      <th scope="col">Growth</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">Q1</th>
      <td>$1.2M</td>
      <td>+5%</td>
    </tr>
    <tr>
      <th scope="row">Q2</th>
      <td>$1.5M</td>
      <td>+25%</td>
    </tr>
  </tbody>
  <tfoot>
    <tr>
      <th scope="row">Total</th>
      <td>$2.7M</td>
      <td>+15%</td>
    </tr>
  </tfoot>
</table>

<!-- Complex table with headers for rows and columns -->
<table>
  <caption>Course Schedule by Instructor and Day</caption>
  <thead>
    <tr>
      <th scope="col">Instructor</th>
      <th scope="col">Monday</th>
      <th scope="col">Tuesday</th>
      <th scope="col">Wednesday</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">Dr. Smith</th>
      <td headers="smith monday">Biology 101</td>
      <td headers="smith tuesday">Biology 201</td>
      <td headers="smith wednesday">Lab</td>
    </tr>
  </tbody>
</table>

Lists

Choosing the Right List Type

<!-- Unordered list (order doesn't matter) -->
<ul>
  <li>Apples</li>
  <li>Bananas</li>
  <li>Oranges</li>
</ul>

<!-- Ordered list (sequence matters) -->
<ol>
  <li>Preheat oven to 350°F</li>
  <li>Mix dry ingredients</li>
  <li>Add wet ingredients</li>
  <li>Bake for 25 minutes</li>
</ol>

<!-- Description list (key-value pairs) -->
<dl>
  <dt>HTML</dt>
  <dd>HyperText Markup Language, the standard markup language for web pages.</dd>
  
  <dt>CSS</dt>
  <dd>Cascading Style Sheets, used to style HTML elements.</dd>
</dl>

<!-- Nested lists -->
<ul>
  <li>Fruits
    <ul>
      <li>Tropical
        <ul>
          <li>Mango</li>
          <li>Papaya</li>
        </ul>
      </li>
      <li>Citrus
        <ul>
          <li>Orange</li>
          <li>Lemon</li>
        </ul>
      </li>
    </ul>
  </li>
</ul>

Performance Optimization

Image Optimization

<!-- Responsive images with srcset -->
<img 
  src="image-800w.jpg"
  srcset="
    image-400w.jpg 400w,
    image-800w.jpg 800w,
    image-1200w.jpg 1200w,
    image-1600w.jpg 1600w
  "
  sizes="(max-width: 600px) 100vw, (max-width: 1200px) 50vw, 800px"
  alt="Descriptive alt text"
  loading="lazy"
  decoding="async"
  width="800"
  height="600"
>

<!-- Art direction with picture element -->
<picture>
  <source media="(max-width: 799px)" srcset="mobile-image.jpg">
  <source media="(min-width: 800px)" srcset="desktop-image.jpg">
  <img src="fallback-image.jpg" alt="Descriptive alt text">
</picture>

<!-- Modern image formats with fallback -->
<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Descriptive alt text">
</picture>

<!-- Lazy loading (native) -->
<img src="below-fold-image.jpg" alt="Alt text" loading="lazy">

<!-- Eager loading for above-fold critical images -->
<img src="hero-image.jpg" alt="Alt text" loading="eager" fetchpriority="high">

Resource Loading Strategies

<head>
  <!-- Preconnect to external domains -->
  <link rel="preconnect" href="https://fonts.googleapis.com">
  <link rel="preconnect" href="https://cdn.example.com">
  
  <!-- DNS prefetch for less critical connections -->
  <link rel="dns-prefetch" href="https://analytics.example.com">
  
  <!-- Preload critical resources -->
  <link rel="preload" href="critical-font.woff2" as="font" type="font/woff2" crossorigin>
  <link rel="preload" href="hero-image.jpg" as="image">
  <link rel="preload" href="critical-styles.css" as="style">
  
  <!-- Prefetch for likely next navigation -->
  <link rel="prefetch" href="/next-page.html">
  <link rel="prefetch" href="next-page-image.jpg" as="image">
</head>

<body>
  <!-- Defer non-critical JavaScript -->
  <script src="analytics.js" defer></script>
  
  <!-- Async for independent scripts -->
  <script src="widget.js" async></script>
  
  <!-- Module scripts (deferred by default) -->
  <script type="module" src="app.js"></script>
  
  <!-- Inline critical CSS, load rest async -->
  <style>
    /* Critical above-fold CSS */
  </style>
  <link rel="stylesheet" href="non-critical.css" media="print" onload="this.media='all'">
  <noscript><link rel="stylesheet" href="non-critical.css"></noscript>
</body>

HTML Size Optimization

<!-- ❌ Unnecessary whitespace and comments -->
<div class="container">
  <!-- This is a comment -->
  <p>
    Some text here
  </p>
</div>

<!-- ✅ Minified HTML (use build tools) -->
<div class="container"><p>Some text here</p></div>

<!-- Remove unused attributes -->
<!-- ❌ --> <div id="unused-id" class="unused-class"></div>
<!-- ✅ --> <div></div>

<!-- Combine inline styles (or better, use CSS) -->
<!-- ❌ --> <p style="color: red;"><span style="font-weight: bold;">Text</span></p>
<!-- ✅ --> <p class="error-text">Text</p>

Modern HTML Features

Details and Summary (Native Disclosure)

<details>
  <summary>Click to expand</summary>
  <p>Hidden content that can be toggled.</p>
</details>

<!-- Open by default -->
<details open>
  <summary>FAQ Question</summary>
  <p>Answer to the question.</p>
</details>

Dialog Element (Native Modal)

<dialog id="myDialog">
  <form method="dialog">
    <h2>Dialog Title</h2>
    <p>Dialog content goes here.</p>
    <button value="cancel">Cancel</button>
    <button value="confirm" autofocus>Confirm</button>
  </form>
</dialog>

<button onclick="document.getElementById('myDialog').showModal()">
  Open Dialog
</button>

Data Attributes

<!-- Store custom data -->
<article data-post-id="12345" data-author="jane-doe" data-category="tech">
  <h2>Article Title</h2>
</article>

<!-- Access in JavaScript: element.dataset.postId -->
<!-- Style in CSS: [data-category="tech"] { } -->

Template Element

<!-- Define reusable markup -->
<template id="item-template">
  <li class="item">
    <h3 class="item-title"></h3>
    <p class="item-description"></p>
  </li>
</template>

<!-- Clone and use with JavaScript -->
<script>
  const template = document.getElementById('item-template');
  const clone = template.content.cloneNode(true);
  // Populate and append
</script>

Content Embedding

Videos

<!-- Native video with controls -->
<video 
  controls 
  width="640" 
  height="360"
  poster="video-thumbnail.jpg"
  preload="metadata"
>
  <source src="video.webm" type="video/webm">
  <source src="video.mp4" type="video/mp4">
  <track 
    kind="subtitles" 
    src="subtitles-en.vtt" 
    srclang="en" 
    label="English"
  >
  <track 
    kind="captions" 
    src="captions-en.vtt" 
    srclang="en" 
    label="English CC"
    default
  >
  <p>Your browser doesn't support HTML5 video. 
     <a href="video.mp4">Download the video</a> instead.</p>
</video>

<!-- YouTube embed with title for accessibility -->
<iframe 
  width="560" 
  height="315" 
  src="https://www.youtube.com/embed/VIDEO_ID" 
  title="Video Title for Accessibility"
  frameborder="0" 
  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" 
  allowfullscreen
  loading="lazy"
></iframe>

Audio

<audio controls preload="metadata">
  <source src="audio.mp3" type="audio/mpeg">
  <source src="audio.ogg" type="audio/ogg">
  <p>Your browser doesn't support HTML5 audio. 
     <a href="audio.mp3">Download the audio</a> instead.</p>
</audio>

Iframes

<!-- Iframe with proper attributes -->
<iframe 
  src="https://example.com/embed"
  title="Descriptive title for screen readers"
  width="600"
  height="400"
  loading="lazy"
  sandbox="allow-scripts allow-same-origin"
></iframe>

Validation and Quality

HTML Validation Checklist

Common HTML Mistakes to Avoid

<!-- ❌ Block element inside inline element -->
<a href="#"><div>Link content</div></a>

<!-- ✅ Inline element or make the link a block -->
<a href="#" style="display: block"><div>Link content</div></a>

<!-- ❌ Using <br> for spacing -->
<p>First paragraph</p>
<br><br>
<p>Second paragraph</p>

<!-- ✅ Use CSS margins -->
<p>First paragraph</p>
<p style="margin-top: 2rem;">Second paragraph</p>

<!-- ❌ Divitis (unnecessary divs) -->
<div>
  <div>
    <div>
      <p>Content</p>
    </div>
  </div>
</div>

<!-- ✅ Minimal markup -->
<p>Content</p>

<!-- ❌ Empty elements with no purpose -->
<div></div>
<span></span>

<!-- ✅ Remove or add content/styling purpose -->

<!-- ❌ Using tables for layout -->
<table>
  <tr>
    <td>Sidebar</td>
    <td>Main content</td>
  </tr>
</table>

<!-- ✅ Use CSS Grid or Flexbox -->
<div class="layout">
  <aside>Sidebar</aside>
  <main>Main content</main>
</div>

Security Best Practices

Input Sanitization Context

<!-- Never trust user input - always sanitize on server -->

<!-- ❌ Dangerous: directly embedding user input -->
<div>{{userInput}}</div>

<!-- ✅ Escape HTML entities -->
<div>&lt;script&gt;alert('safe')&lt;/script&gt;</div>

<!-- Use Content Security Policy -->
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' https://trusted.cdn.com">

External Resources

<!-- Add integrity checks for external resources -->
<script 
  src="https://cdn.example.com/library.js"
  integrity="sha384-HASH_HERE"
  crossorigin="anonymous"
></script>

<!-- Use rel="noopener" for external links -->
<a href="https://external-site.com" target="_blank" rel="noopener noreferrer">
  External Link
</a>

Progressive Enhancement

Build from HTML Up

<!-- 1. Start with working HTML -->
<details>
  <summary>Expandable Section</summary>
  <p>Content revealed when expanded.</p>
</details>

<!-- 2. Enhance with CSS (optional) -->
<style>
  details { border: 1px solid #ccc; padding: 1rem; }
  summary { cursor: pointer; font-weight: bold; }
</style>

<!-- 3. Add JavaScript enhancements (optional) -->
<script>
  // Add analytics, animations, or custom behavior
  document.querySelectorAll('details').forEach(detail => {
    detail.addEventListener('toggle', () => {
      if (detail.open) {
        // Track expansion
      }
    });
  });
</script>

Tools and Workflow

Recommended Tools

Purpose	Tool	Why
Validation	W3C Validator	Check HTML validity
Accessibility	axe DevTools	Find a11y issues
Performance	Lighthouse	Audit performance
HTML Minification	html-minifier	Reduce file size
Linting	HTMLHint	Catch common mistakes

HTML in Build Pipelines

# Validate HTML
npx html-validate src/**/*.html

# Minify HTML
npx html-minifier --collapse-whitespace --remove-comments input.html -o output.html

# Check accessibility
npx pa11y http://localhost:3000

Quick Reference

Common Character Entities

Character	Entity	Numeric
<	`<`	`<`
>	`>`	`>`
&	`&`	`&`
"	`"`	`"`
'	`'`	`'`
©	`©`	`©`
®	`®`	`®`
™	`™`	`™`
non-breaking space	` `	` `
— (em dash)	`—`	`—`
– (en dash)	`–`	`–`

Global Attributes

Available on all HTML elements:

id - Unique identifier
class - CSS class names (space-separated)
style - Inline CSS styles
title - Advisory information (tooltip)
lang - Language of element content
dir - Text directionality (ltr, rtl, auto)
hidden - Hide element
tabindex - Tab order (-1, 0, positive numbers)
contenteditable - Make element editable
data-* - Custom data attributes
draggable - Enable drag and drop
spellcheck - Enable spell checking

Best Practices Summary

Always check Context7 MCP before writing/editing code - Leverage project-specific patterns and requirements
Always use semantic HTML - Choose elements based on meaning, not appearance
Validate your HTML - Use W3C validator to catch errors
Prioritize accessibility - Use ARIA attributes, alt text, and keyboard navigation
Optimize for performance - Lazy load images, defer scripts, minimize HTML
Use progressive enhancement - Start with HTML, layer on CSS and JavaScript
Keep it simple - Don't over-engineer with unnecessary divs and complexity
Test across browsers - Ensure compatibility with all major browsers
Think mobile-first - Design for small screens, enhance for larger ones
Use meaningful names - IDs and classes should describe purpose, not appearance
Comment sparingly - Code should be self-documenting, comments for complex logic only

name	html
description	Write semantic, accessible, performant HTML with modern best practices. Use when asked to (1) create HTML pages or documents, (2) write semantic markup, (3) improve accessibility, (4) optimize HTML structure and performance, (5) implement forms, tables, or complex layouts, or when phrases like "HTML page", "web page", "markup", "semantic HTML", "accessibility" appear.

html

このリポジトリの他の Skills

このリポジトリの他の Skills

Expert HTML Development

MCP Integration - Context7

Core Principles

Document Structure

Minimal Valid HTML5 Document

Essential Meta Tags

Semantic HTML Elements

Use the Right Element for the Job

Sectioning Elements

Heading Hierarchy

Accessibility Best Practices

ARIA Labels and Roles

Focus Management

Alternative Text

ARIA Live Regions

Forms

Accessible Form Structure

HTML5 Input Types

Input Attributes for Better UX

Tables

Accessible Data Tables

Lists

Choosing the Right List Type

Performance Optimization

Image Optimization

Resource Loading Strategies

HTML Size Optimization

Modern HTML Features

Details and Summary (Native Disclosure)

Dialog Element (Native Modal)

Data Attributes

Template Element

Content Embedding

Videos

Audio

Iframes

Validation and Quality

HTML Validation Checklist

Common HTML Mistakes to Avoid

Security Best Practices

Input Sanitization Context

External Resources

Progressive Enhancement

Build from HTML Up

Tools and Workflow

Recommended Tools

HTML in Build Pipelines

Quick Reference

Common Character Entities

Global Attributes

Best Practices Summary

Expert HTML Development

MCP Integration - Context7

Core Principles

Document Structure

Minimal Valid HTML5 Document

Essential Meta Tags

Semantic HTML Elements

Use the Right Element for the Job

Sectioning Elements

Heading Hierarchy

Accessibility Best Practices

ARIA Labels and Roles

Focus Management

Alternative Text

ARIA Live Regions

Forms

Accessible Form Structure

HTML5 Input Types

Input Attributes for Better UX

Tables

Accessible Data Tables

Lists

Choosing the Right List Type

Performance Optimization

Image Optimization

Resource Loading Strategies