HTML Introduction

HTML is the skeleton of every web page — meet the language that powers the entire internet.

What is HTML?

HTML stands for HyperText Markup Language. It is the standard language used to create web pages — every site you visit (Google, YouTube, Facebook) is built on HTML.

Let's break the name down:

Hyper

Refers to the ability to link different web pages together.
Enables navigation using links (click and jump).

Text

Refers to the content of a webpage.
Includes words, paragraphs, headings, etc.

Markup

Means adding tags or symbols to text.
Defines the structure and presentation of content.

Language

A system of rules used to communicate with computers.
HTML uses a specific syntax to create web pages.

Anatomy of an HTML Element

In a Nutshell

HTML structures content like text, images, links, forms, and videos.
HTML uses tags and elements to display content in a browser.
It is not a programming language, but a markup language.
Web browsers read HTML code and render it as a webpage.

What is Markup?

Markup means adding special symbols or tags to text to define its structure and presentation. These tags tell the browser how to display the content.

html
<p>This is a paragraph.</p>

Here, <p> is a tag that marks the text as a paragraph.

HTML Tags

HTML tags are special keywords written inside angle brackets < >.
They define how content should be displayed.
Most tags come in pairs: an opening tag and a closing tag.

HTML Elements

An HTML element includes the opening tag + content + closing tag.
It represents a complete part of a webpage.
Most tags come in pairs: opening tag and closing tag.

html
<p>This is paragraph content.</p>

The whole line is an HTML element, while <p> is a tag.

Why Learn HTML?

HTML is the foundation of all websites.
Essential for web development (frontend & backend).
Easy to learn and beginner-friendly.
Required before learning CSS and JavaScript.
Helps build websites, blogs, and web apps.
Used in almost every tech industry.

History and Creator of HTML

HTML was created by Tim Berners-Lee in 1991.
He developed HTML while working at CERN (European Organization for Nuclear Research).

First Web Browser

The first web browser was also created by Tim Berners-Lee.
It was called WorldWideWeb (later renamed Nexus).
It was used to view and edit web pages.

Evolution of HTML

Version	Highlight
HTML 1.0	Basic version
HTML 2.0	Standardisation
HTML 4.01	Advanced features
HTML5	Latest version (used today) — semantic tags, multimedia, modern forms

Common Mistakes

Thinking HTML is a "programming language" — it's a markup language. No logic, no loops.
Forgetting the closing tag — <p>Hello instead of <p>Hello</p> makes the browser guess.
Confusing HTML with CSS — colours, fonts, layouts belong in CSS, not inline HTML attributes.
Skipping <!DOCTYPE html> — browsers fall back to "quirks mode" without it.
Using uppercase tags (<P>) — works, but lowercase is the modern convention.

Interview Questions

Practice Exercises

Hello page — Save the snippet from above as index.html and open it in your browser. Change the heading to your name. Hint: edit the text inside <h1>.
Multi-paragraph — Add three more <p> paragraphs about yourself: name, age, hobby. Hint: each paragraph is <p>...</p>.
Title test — Change the <title> and reload. Notice the browser tab updates. Hint: title appears on the tab, not the page.
Spot the bug — Why doesn't this render correctly? <h1>Welcome <p>to my site</h1></p> Hint: tags must close in the order they open.

Think Like a Programmer: HTML is the foundation. Master it deeply before jumping to React or Vue — every modern UI library still produces HTML at the end of the day.

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