HTML Introduction
Overview
HyperText Markup Language (HTML) is the absolute foundation of the World Wide Web. It is not a programming language; it is a markup language that dictates the strict structure and semantic meaning of web content. Browsers read HTML documents and render them into visible web pages. Understanding modern HTML5 is critical because properly structured HTML inherently improves SEO (Search Engine Optimization), accessibility for visually impaired users, and serves as the sturdy scaffolding upon which CSS styling and JavaScript logic are built.
Syntax
<!-- The absolute minimum valid HTML5 Document -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>My First Webpage</title>
</head>
<body>
<h1>Welcome to the Web</h1>
<p>This is a paragraph of text.</p>
</body>
</html>Common Pitfalls
- Forgetting the
<!DOCTYPE html>declaration. Without it, older browsers will enter 'Quirks Mode', which applies legacy rules that will catastrophically break your modern CSS layouts. - Omitting the closing tags on elements (e.g.,
<p>Textinstead of<p>Text</p>). While modern browsers are remarkably good at guessing where tags should close, this often leads to deeply nested, broken layouts.
Interview Questions
No. HTML is a 'Markup Language'. It is purely declarative, meaning it lacks conditional logic (if/else), variables, and loops. It simply describes the structure of data.
Real-World Example
A cleanly structured, SEO-friendly article header.
<article>
<header>
<h1>The Future of Web Development</h1>
<p>Published on: <time datetime="2026-10-15">October 15, 2026</time></p>
</header>
<p>Web development is evolving rapidly...</p>
</article>Check Your Knowledge
Test your understanding of HTML Introduction with these quick questions.