HTML

HTML Cheat Sheets

Use this HTML cheat sheet to create web pages faster and more efficiently.

Basic HTML Structure

// HTML Document Structure

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

</body>
</html>
Basic HTML5 document structure

Elements and Attributes

// Common HTML Elements

<a>
Defines a hyperlink
<p>
Defines a paragraph
<div>
Defines a division or section
<span>
Defines a section in a document
<img>
Embeds an image

Forms and Input

// Form Element

<form action="/submit" method="post">
    <label for="name">Name:</label>
    <input type="text" id="name" name="name">
    <input type="submit" value="Submit">
</form>
Creating a basic form

Semantic HTML

// Semantic Elements

<header>
Defines a header for a document or section
<nav>
Defines navigation links
<section>
Defines a section in a document
<article>
Defines an independent piece of content
<footer>
Defines a footer for a document or section

Multimedia

// Embedding Video

<video width="320" height="240" controls>
    <source src="movie.mp4" type="video/mp4">
    Your browser does not support the video tag.
</video>
Using the <video> element

Best Practices

// HTML Best Practices

Use Semantic Elements
Improve accessibility and SEO
Validate HTML
Ensure cross-browser compatibility

Advanced HTML5 Features

// Canvas Element

<canvas id="myCanvas" width="200" height="100" style="border:1px solid #000000;">
Your browser does not support the canvas element.
</canvas>
Drawing graphics with canvas

Accessibility

// Accessibility Best Practices

Use ARIA Roles
Enhance accessibility for screen readers
Alt Text for Images
Provide text alternatives for images

SEO Best Practices

// SEO Tips

Use Meta Tags
Improve search engine visibility
Semantic HTML
Enhance content structure for SEO

Responsive Design

// Media Queries

@media only screen and (max-width: 600px) {
    body {
        background-color: lightblue;
    }
}
Adapting layout to different screen sizes

HTML5 APIs

// Geolocation API

navigator.geolocation.getCurrentPosition(function(position) {
    console.log("Latitude: " + position.coords.latitude + 
    "
Longitude: " + position.coords.longitude);
});
Accessing user location

Progressive Web Apps (PWAs)

// Service Workers

self.addEventListener("install", function(event) {
    event.waitUntil(
        caches.open("v1").then(function(cache) {
            return cache.addAll([
                "/",
                "/styles/main.css",
                "/script/main.js"
            ]);
        })
    );
});
Caching and offline capabilities

HTML5 Security

// Security Best Practices

Content Security Policy
Prevent XSS attacks
Secure Cookies
Use HttpOnly and Secure flags

Advanced Multimedia

// Audio API

var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
var oscillator = audioCtx.createOscillator();
oscillator.type = "square";
oscillator.frequency.setValueAtTime(440, audioCtx.currentTime);
oscillator.connect(audioCtx.destination);
oscillator.start();
Manipulating audio content

HTML5 Game Development

// Game Loop

function gameLoop() {
    requestAnimationFrame(gameLoop);
    // Update game state
    // Render game
}
gameLoop();
Basic game loop structure

HTML5 Graphics

// SVG Basics

<svg width="100" height="100">
    <circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
</svg>
Scalable Vector Graphics

Web Components

// Custom Elements

class MyElement extends HTMLElement {
    constructor() {
        super();
        this.attachShadow({ mode: "open" });
    }
}
customElements.define("my-element", MyElement);
Defining new HTML elements

Internationalization

// i18n Best Practices

Use lang Attribute
Specify language of content
Character Encoding
Use UTF-8 for universal compatibility

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