HTML document structure - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify the correct root element of an HTML5 document

Which tag is the correct root element that must wrap all other elements in a valid HTML5 document?

A <head>

B <body>

C <html>

D <document>

💡 Hint

Think about the tag that contains both the <head> and <body> sections.

The <html> tag is the root element of an HTML5 document. It wraps the entire content including <head> and <body>.

📝 Syntax

intermediate

What error occurs if the <head> tag is missing in an HTML document?

Consider this HTML snippet missing the <head> tag. What is the most likely outcome when rendered in a modern browser?

HTML

<!DOCTYPE html>
<html>
<body>
<h1>Hello</h1>
</body>
</html>

A The browser displays the raw HTML code as text.

B The page renders normally with the heading visible.

C The page shows a blank screen with no content.

D The browser throws a syntax error and stops rendering.

💡 Hint

Browsers are forgiving and try to display content even if some tags are missing.

Modern browsers automatically handle missing <head> tags and render the content inside <body> normally.

❓ rendering

advanced

What is the visual output of this HTML document?

Given the following HTML code, what will the user see in the browser?

HTML

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Test Page</title>
</head>
<body>
<header>
<h1>Welcome</h1>
</header>
<main>
<p>This is a test.</p>
</main>
<footer>
<p>Footer text</p>
</footer>
</body>
</html>

A A page with a large heading 'Welcome', a paragraph 'This is a test.', and a footer with 'Footer text'.

B Only the heading 'Welcome' is visible; paragraphs are hidden by default.

C The page shows the title 'Test Page' but no visible content.

D The page is blank because the &lt;main&gt; tag is not supported.

💡 Hint

All semantic tags like <header>, <main>, and <footer> display their content by default.

The browser renders all visible content inside semantic tags. The heading, paragraph, and footer text appear as normal text.

❓ selector

advanced

Which CSS selector targets the <main> element inside the <body>?

Given this HTML structure, which CSS selector correctly selects the <main> element? <body> <header></header> <main></main> <footer></footer> </body>

A body > main

B main > body

C body main header

D main + footer

💡 Hint

The > symbol means direct child in CSS selectors.

The selector 'body > main' selects the <main> element that is a direct child of <body>.

❓ accessibility

expert

Which attribute improves accessibility by specifying the language of the document?

In an HTML document, which attribute should be added to the root <html> tag to help screen readers and browsers understand the language?

A role="document"

B charset="UTF-8"

C aria-label="English"

D lang="en"

💡 Hint

This attribute uses a short code like 'en' for English.

The 'lang' attribute on the <html> tag specifies the document language, helping screen readers and search engines.

Practice

1. Which tag defines the root of an HTML document?

easy

A. <body>

B. <head>

C. <title>

D. <html>

Solution

1. Step 1: Understand the role of the root tag

   The root tag wraps the entire HTML content and tells the browser this is an HTML document.

2. Step 2: Identify the root tag

   The <html> tag is the root element that contains all other tags like <head> and <body>.

3. Final Answer:

   <html> -> Option D

4. Quick Check:

   Root tag = <html> [OK]

Hint: Root tag is always <html> wrapping the whole page [OK]

Common Mistakes:

• Confusing <head> as root instead of <html>
• Thinking <body> is the root tag
• Using <title> as root tag

2. Which of the following is the correct way to declare the document type for HTML5?

easy

A.

B.

C.

D.

Solution

1. Step 1: Recall the HTML5 doctype declaration

   HTML5 uses a simple doctype declaration to tell browsers to use modern standards.

2. Step 2: Identify the correct syntax

   The correct syntax is exactly <!DOCTYPE html> with uppercase DOCTYPE and lowercase html.

3. Final Answer:

   <!DOCTYPE html> -> Option A

4. Quick Check:

   HTML5 doctype = <!DOCTYPE html> [OK]

Hint: DOCTYPE is uppercase, html lowercase, no version number [OK]

Common Mistakes:

• Writing DOCTYPE in lowercase
• Adding version number like HTML5
• Missing exclamation mark

3. What will the browser display when opening this HTML snippet?

<!DOCTYPE html>
<html>
<head>
  <title>Test Page</title>
</head>
<body>
  <h1>Hello</h1>
  <p>Welcome to the page.</p>
</body>
</html>

medium

A. Only the title 'Test Page' is shown on the page

B. An empty page with no visible content

C. A page with a heading 'Hello' and a paragraph 'Welcome to the page.'

D. An error message because of missing tags

Solution

1. Step 1: Analyze the body content

   The body contains an <h1> with 'Hello' and a <p> with 'Welcome to the page.'

2. Step 2: Understand browser rendering

   Browsers display the content inside the <body> tag as visible page content. The <title> appears in the browser tab, not on the page.

3. Final Answer:

   A page with a heading 'Hello' and a paragraph 'Welcome to the page.' -> Option C

4. Quick Check:

   Body content visible = heading + paragraph [OK]

Hint: Page shows body content, title shows in tab only [OK]

Common Mistakes:

• Thinking <title> shows on the page
• Expecting error from correct tags
• Ignoring body content

4. Identify the error in this HTML structure:

<!DOCTYPE html>
<html>
<head>
  <title>Page</title>
<body>
  <h1>Welcome</h1>
</body>
</html>

medium

A. Missing <title> tag inside <head>

B. Missing closing <head> tag before <body>

C. Extra <body> tag inside <head>

D. DOCTYPE declaration is incorrect

Solution

1. Step 1: Check tag nesting

   The <head> tag is opened but never closed before <body> starts, which breaks structure.

2. Step 2: Confirm correct closing tags

   Proper HTML requires closing <head> before starting <body>. Missing </head> causes parsing issues.

3. Final Answer:

   Missing closing <head> tag before <body> -> Option B

4. Quick Check:

   Head must close before body starts [OK]

Hint: Always close <head> before starting <body> [OK]

Common Mistakes:

• Forgetting to close <head>
• Placing <title> outside <head>
• Misplacing DOCTYPE

5. You want to create a valid HTML5 page with a header, main content, and footer. Which structure is correct?

hard

A.

My Page

Site Header
Main content here
Site Footer

B.

My Page
Site Header

Main content here
Site Footer

C.

My Page

Main content here
Site Footer
Site Header

D.

My Page

Site Header
Site Footer

Solution

1. Step 1: Check for required tags and order

   Valid HTML5 requires <!DOCTYPE html>, <html> with lang attribute, <head> with meta charset and title, and <body> with semantic sections.

2. Step 2: Verify semantic tags and placement

   <!DOCTYPE html>
   <html lang="en">
   <head>
     <meta charset="UTF-8">
     <title>My Page</title>
   </head>
   <body>
     <header>Site Header</header>
     <main>Main content here</main>
     <footer>Site Footer</footer>
   </body>
   </html>

   correctly places <header>, <main>, and <footer> inside <body> and includes meta charset and lang attribute.

3. Final Answer:

   The complete valid HTML5 structure with lang, meta charset, title, header, main, footer -> Option A

4. Quick Check:

   Valid HTML5 = DOCTYPE + lang + meta + semantic tags [OK]

Hint: Use semantic tags inside <body> with proper <head> metadata [OK]

Common Mistakes:

• Placing <header> inside <head>
• Missing lang or meta charset
• Incorrect order of semantic tags