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What each technology does
Most confusion at the start comes from treating the three technologies as interchangeable. They are not. MDN’s overview of web standards uses a house analogy: HTML is the structure, CSS is the decoration and layout, and JavaScript supplies the useful functions. The analogy is useful for a few minutes, but the definitions below are what you should carry forward.
HTML: structure and meaning
HTML wraps content in elements such as headings, paragraphs, lists, links, and images. Each element tells the browser what a piece of content is. A <h1> is the main heading of a page, a <p> is a paragraph, and an <img> is an image. Without CSS, an HTML page still displays, just in the browser’s plain default styling.
CSS: presentation and layout
CSS consists of rules. Each rule has a selector, which picks which elements to style, and declarations, which set properties such as color, spacing, or width. Changing the CSS changes how the page looks without changing its content.
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JavaScript: behavior
JavaScript runs in the browser and responds to events, such as a click, a keypress, or a form submission. It can read and change the page while it is open. A button that updates text on the screen is a complete example of JavaScript doing its job.
What you need before you start
- A computer with a modern browser. Any current version of Chrome, Firefox, Edge, or Safari is enough for the exercises below.
- A code editor. Any plain-text editor that saves
.html,.css, and.jsfiles will work. Editors with syntax highlighting make mistakes easier to spot, but they are not required. - Basic file handling. You need to create a folder, create files inside it, and open a file in your browser. That is the whole requirement.
- Willingness to edit and reload. Most of the learning happens when you change a line, save, reload, and see what broke.
MDN’s environment setup guide covers installing software, file systems, and command-line basics. You can read it when you need it, but the first page does not require terminal work. The MDN beginner route assumes no prior web-technology knowledge, and its first lessons do not require prior coding experience.
Your first project, step by step
The project is a single personal page with a heading, a paragraph, a link, an image, a few style changes, and one button. MDN’s guidance for a first website is to start small, and the official line is worth keeping in mind: “It’s a lot of work to create a professional website, so if you’re new to web development, we encourage you to start small.” (MDN Web Docs, Your first website)
Step 1: Create a project folder
Create a folder on your computer, for example my-first-page. Inside it, you will eventually have three files: index.html, styles.css, and script.js. Keep all three in the same folder so the relative links between them work without extra configuration.
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Step 2: Plan the page on paper
Before you type any code, write down what the page should show: one heading, two or three sentences about yourself or a hobby, one link, one picture, and one button. Narrow topics work best. A favorite book, a local event, or a short introduction are all good first subjects, and MDN’s first-website tutorial uses this planning step before any code is written.
Step 3: Write the HTML
Create index.html and paste in this skeleton. It is the minimum a browser needs to display a page that is correctly declared as HTML and linked to a stylesheet and a script:
<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset='utf-8'>
<meta name='viewport' content='width=device-width, initial-scale=1'>
<title>My First Page</title>
<link rel='stylesheet' href='styles.css'>
</head>
<body>
<h1>Hello, I'm learning to build websites</h1>
<p>This page is my first attempt. My favorite book is <a href='https://developer.mozilla.org/en-US/docs/Learn_web_development'>a learning guide I use often</a>.</p>
<img src='photo.jpg' alt='A stack of books on a wooden desk'>
<button id='greet'>Say hello</button>
<p id='message'></p>
<script src='script.js'></script>
</body>
</html>Three details matter at this stage. The <head> holds information about the page that is not shown as content, such as the title and the stylesheet link. The alt attribute on the image describes the picture for people who cannot see it, so write it as a short, real description. And the href on the link points to a full web address; for a link to another page on your own site, you would use a relative filename instead. You can use any image file you have; if you do not have one yet, use a placeholder name and add the picture later, though the image will show as broken until the file exists.
Step 4: Add CSS
Create styles.css in the same folder. CSS rules select elements by name and apply declarations to them. Start with a few changes you can see immediately:
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body {
font-family: Georgia, serif;
line-height: 1.5;
max-width: 40rem;
margin: 2rem auto;
padding: 0 1rem;
}
h1 {
color: #1d4f91;
}
img {
max-width: 100%;
height: auto;
}Reload the page after each change. If the text does not change, check that the file name in the <link> tag matches exactly, including capitalization. Those mismatches are among the most common causes of a stylesheet that appears to do nothing.
Step 5: Add one JavaScript behavior
Create script.js with the following code. It introduces three ideas in one place: a variable (const), a function, and an event handler. The handler is the part that runs when the button is clicked.
const button = document.querySelector('#greet');
const message = document.querySelector('#message');
button.addEventListener('click', function () {
message.textContent = 'Thanks for visiting!';
});Click the button in the browser. The text under it should change. If nothing happens, open the browser’s developer tools (in Chrome, Edge, or Firefox on Windows and Linux, press Ctrl+Shift+I; on macOS, press Cmd+Option+I) and look at the Console tab. A message such as an error about a missing element usually points to a mistyped ID, and the ID in the HTML must match the one in the selector exactly.
Step 6: Preview, revise, and publish the file
For a static page like this one, you can preview it by opening index.html directly in your browser. Save your files after every change and reload the tab. Work through a few small revisions: change the heading, change the color, change the button text. Each reload is a quick test of your understanding.
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Publishing a page to a public address is a separate step, and it is covered in the deployment material that follows the core curriculum. You do not have to publish anything to finish this project. A working page on your own computer is a complete first website.
How to practice without getting stuck
- Change one thing at a time. If a page breaks after several edits, you will not know which edit caused it. Undo the last change and reload.
- Use the Console and Elements panels. The Elements panel shows the HTML the browser actually built, which is useful when your CSS selector does not match what you expected.
- Use MDN’s practice material. MDN’s Learn pages include exercises and playground-style examples that you can copy into a local file or an online editor and modify.
- Keep a copy of the working version. Save the page once it works, then experiment on a copy.
Where to learn next, and how the options compare
The sequence after your first page is fairly well defined. MDN suggests the Getting started module for a true beginner and then the Core modules, which expand into semantic HTML, CSS, JavaScript, accessibility, and managing and deploying code. Extensions follow Core as you develop additional skills. Frameworks are later tools, and you do not need one to understand the basics.
Two main routes are relevant for a beginner. The first is MDN’s free, self-paced documentation and modules. The second is a guided interactive course. The table compares them on the factors that usually matter when choosing:
| Factor | MDN Learn web development (free modules) | Scrimba interactive course (named as an MDN learning partner) |
|---|---|---|
| Cost | Free to read and use, per MDN’s Learn section | Not stated in the sources reviewed for this guide; check the course page for current pricing and terms |
| Structure | Defined sequence from Getting started through Core, with Extensions afterward | Guided course; MDN describes its Frontend Developer Career Path as a learning partner offering interactive lessons and challenges |
| Hands-on feedback | Practice exercises and playground examples you run yourself | Interactive lessons and challenges, with some components available in standalone free versions (per MDN) |
| Best fit | A flexible reference you can revisit and a self-directed path | A learner who wants a scheduled, guided path with built-in exercises |
Use MDN’s Learn web development pathway as your main reference. A paid course is optional. MDN itself describes its Learn curriculum as taking a learner from beginner to comfortable, not to professional readiness, and completing introductory material alone should not be treated as a job qualification.
Is a printed book worth buying?
A physical book can help, but it is not required. Jon Duckett’s HTML and CSS: Design and Build Websites is published by Wiley as a 512-page paperback, first edition November 2011, ISBN 978-1-118-00818-8. The publisher describes it as a full-color introduction intended to make HTML and CSS accessible (see the publisher’s listing).
Because the edition dates from 2011, and because it covers HTML and CSS rather than JavaScript, treat it as a visual reference for layout and markup concepts. Pair it with the current MDN pages for JavaScript and for any browser behavior that has changed since 2011.
Where to go after the first page
Once your page works, a sensible next move is to rebuild it with more care rather than to jump to a framework. Replace generic containers with semantic elements such as <header>, <main>, and <nav> where they fit. Add a second page and link between the two. Learn CSS layout so the page adapts to narrow screens. Extend the JavaScript so it reacts to form input or updates a list. Then move through the accessibility material, which covers keyboard use, contrast, and screen-reader-friendly markup, and the deployment material, which covers putting the site online.
When you reach that point, the Core modules on MDN are the next structured step, and they are the reference to return to as you build.
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