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COURSE TOPIC

Web Fundamentals, HTML, CSS and JavaScript

Understand browsers, HTTP and responsive UI foundations before connecting a frontend to Java APIs.

Part of course Java Full Stack Developer Course
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Difficulty Level
Beginner to Intermediate
Estimated Learning Time
4–6 hours
OVERVIEW

About Web Fundamentals, HTML, CSS and JavaScript

Explore the browser and HTTP request-response cycle, then apply semantic HTML, responsive CSS and JavaScript to build user interfaces that communicate clearly with backend services.

LEARNING OUTCOMES

What You Will Learn

  • Describe how a browser sends HTTP requests and receives responses.
  • Structure pages with semantic HTML and responsive CSS.
  • Use JavaScript events and asynchronous requests to update an interface.
  • Represent success, loading, empty and error states for API-backed features.
TOPIC GUIDE

Learn Web Fundamentals, HTML, CSS and JavaScript

What happens between a browser and a server?

A web page is not just a visual document. The browser requests resources and application data using HTTP. A request includes a method, a URL and sometimes headers or a body. The server returns a status code, headers and often a JSON payload. Understanding this exchange makes it easier to debug a full-stack feature when the page and backend do not agree.

Use browser developer tools to inspect the Network panel, request payloads, response status codes and console errors. A successful HTTP response does not guarantee the UI is correct, and a failed request should not leave the interface in a confusing state.

Build an accessible, responsive interface

Semantic HTML gives content and controls meaning. Use headings in a logical order, labels for form fields and buttons for actions. CSS layout tools such as flexbox and grid can adapt a design to different screen widths. Test keyboard navigation, focus visibility and readable contrast as part of normal implementation rather than as a late polish step.

JavaScript adds interaction. Event handlers should respond to user actions, while asynchronous requests allow the page to communicate with an API without blocking the browser. Parse response data carefully and distinguish loading, success, empty and error states. Avoid assuming a request always succeeds or that returned fields are always present.

Connect interface behavior to API contracts

The frontend and backend need a shared understanding of URLs, methods, request fields and response shapes. JSON is commonly used to exchange structured data. A form might send a title and receive a created record with an identifier and timestamp. Show validation feedback near the relevant controls and preserve user input when a request fails.

For larger interfaces, split behavior into small functions and reusable components. Keep network access separate from rendering where practical so each part can be understood and tested. The same discipline helps when the JavaScript interface later becomes a React application.

Practice realistic browser states

Test with slow responses, empty data, invalid input and server errors, not only the ideal case. Ensure a user can tell what is happening and what to do next. Protect sensitive values: never place secrets in frontend code, since browser assets are visible to users.

PRACTICAL EXAMPLE

Example / Code

Example 
async function loadTasks() {
  const response = await fetch('/api/tasks');

  if (!response.ok) {
    throw new Error(`Request failed: ${response.status}`);
  }

  return response.json();
}

loadTasks()
  .then(tasks => renderTasks(tasks))
  .catch(() => showError('Tasks could not be loaded.'));
TRY IT YOURSELF

Practice Task

Apply what you learned with a practical activity.

Create a responsive task list screen using semantic HTML and CSS. Add JavaScript that loads a JSON response, displays a loading state, handles an empty list and shows a useful error when the request fails. Test the layout at a narrow mobile width.

TOOLKIT

Tools & Technologies

  • HTML
  • CSS
  • JavaScript
  • Browser DevTools
  • VS Code
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