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Frontend Academy · Lesson

HTML CSS and JavaScript: Each Layer's Job

Understand what HTML, CSS, and JavaScript each contribute to a webpage and why separating concerns makes sites maintainable.

The Three Pillars of the Web

Every webpage is built from three complementary technologies: HTML for structure, CSS for presentation, and JavaScript for behaviour. Keeping them separate is one of the most important principles in frontend development.

HTML — Structure and Meaning

HTML (HyperText Markup Language) describes what content is. A heading, a paragraph, a list, a form — HTML gives content semantic meaning that browsers, search engines, and screen readers all understand.

<!DOCTYPE html>
<html lang="en">
  <head><title>My Page</title></head>
  <body>
    <h1>Hello World</h1>
    <p>This is a paragraph.</p>
  </body>
</html>

All lessons in this course

  1. Browsers DNS and HTTP: The Request Lifecycle
  2. HTML CSS and JavaScript: Each Layer's Job
  3. How a Page Renders: Parsing DOM CSSOM Layout Paint
  4. Developer Tools: Opening and Using DevTools
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