Explain what a web browser does
Connect HTML rendering to the browser tools people use to find, navigate and revisit pages.
This sequence follows Cambridge IGCSE Computer Science 0478, 2026–2028 syllabus Version 6. It covers subject content sections 5.1–5.3 only. The separately published 2029–2031 syllabus is not mapped here. Practice is original, self-checked and does not award an official Cambridge grade. Full timed papers and human subject-teacher review remain outstanding.
Before you begin
- No programming language is required. Be comfortable with place value and multiplication; each lesson introduces the computer-science notation it uses.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which application renders web pages for a user?
What you will learn
- Explain a browser's main purpose
- Describe how it renders HTML
- Identify common browser functions
The browser retrieves and displays web pages
A web browser requests web resources and renders Hypertext Markup Language (HTML) into a page a person can view. It also interprets page assets and supports navigation between resources.
Apply and check the rule
Common browser functions include an address bar, navigation tools, bookmarks or favourites, browsing history, multiple tabs and cookie storage. These are browser features; they are not the internet infrastructure itself.
Pause and explain
Which is a common browser function?
Worked example
A student enters a URL, opens a second tab and saves a page for tomorrow. Name three browser functions involved.
Show the worked solution
- The address bar accepts the URL.
- Tabs allow the student to view more than one page at a time.
- A bookmark stores a shortcut for later use.
Answer Address bar, tabs and bookmarks.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Match address bar, history and bookmarks to their use.
Give me a hint
Think about entering, revisiting and saving pages.
Compare my reasoning
- Address bar: enter a URL or search.
- History: review pages previously visited.
- Bookmarks: save selected pages for later.
Address bar enters an address; history records visits; bookmarks save chosen pages.
Look for these in your work
- Three features
- Three roles matched
A page's HTML arrives from a server. What does the browser do with it?
Give me a hint
The user needs a visible page, not raw markup.
Compare my reasoning
- The browser reads the HTML structure.
- It renders the markup and related page resources.
- It displays the resulting page to the user.
It renders the HTML into a displayable web page.
Look for these in your work
- HTML read
- Rendering role
- Display stated
A student says that bookmarking a page copies the website onto the browser. Explain what a bookmark normally stores instead.
Give me a hint
Separate a saved reference from saved page files.
Compare my reasoning
- A bookmark is a browser shortcut or reference.
- It helps the browser revisit the page's address.
- The server still supplies the page when it is requested again.
A bookmark normally saves a reference to the URL, not a full copy of the website. The page is requested from its server when opened.
Look for these in your work
- Reference defined
- URL use
- Server role
Common mistakes
- Saying a browser is the web server
- Confusing rendering HTML with writing the original page
What can you explain now?
What does a browser mainly do with HTML?
Compare with the explanation
Renders it and displays the web page
The browser turns page markup into a visual presentation.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
State the browser's main purpose and name three common functions.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.