Document Structure

• True is incorrect because DOCTYPE is a declaration, not an HTML element.
• False is correct because <!DOCTYPE html> is written as a standalone declaration.

Question 6: What is the DOM?

1. A database that stores every website's HTML.
2. A CSS file generated by the browser.
3. A structured document representation that scripts and browser features can access.
4. A protocol used to transfer HTML from a server.

Correct answer: C — A structured document representation.

• A is incorrect because the DOM is not a website database.
• B is incorrect because the DOM is not a CSS stylesheet.
• C is correct because the DOM represents the document as a structure of nodes and objects.
• D is incorrect because HTTP and HTTPS are communication protocols.

Question 7: True or False — The viewport meta element automatically makes every webpage responsive.

1. True
2. False

Correct answer: B — False.

• True is incorrect because viewport metadata does not automatically create responsive layouts.
• False is correct because responsive behavior also depends on suitable CSS, layout choices and content.

Question 8: What does a browser commonly do when it encounters a new p start tag while another paragraph is still open?

1. It always stops parsing the document.
2. It treats the new p element as a CSS rule.
3. It converts both paragraphs into one heading.
4. It closes the previous paragraph during HTML parsing.

Correct answer: D — It closes the previous paragraph during HTML parsing.

• A is incorrect because browsers generally attempt to recover from common HTML errors.
• B is incorrect because p is an HTML element, not a CSS rule.
• C is incorrect because a paragraph start tag does not convert content into a heading.
• D is correct because HTML parsing rules close an open paragraph when a new p start tag is processed in this context.

Question 9: Which attribute identifies the primary language of an HTML document?

1. lang
2. charset
3. viewport
4. rel

Correct answer: A — lang.

• A is correct because lang identifies the language of the document or element.
• B is incorrect because charset specifies character encoding.
• C is incorrect because viewport is used in viewport metadata.
• D is incorrect because rel describes a relationship between a linked resource and the current document.

Question 10: What is a common effect of omitting a suitable DOCTYPE from an HTML document?

1. The browser cannot display any HTML content.
2. The browser may enter quirks mode.
3. The browser automatically adds a server-side framework.
4. The browser disables all CSS permanently.

Correct answer: B — The browser may enter quirks mode.

• A is incorrect because browsers can still parse and display HTML without DOCTYPE.
• B is correct because a missing or legacy-triggering DOCTYPE can cause quirks mode.
• C is incorrect because a browser does not add a server-side framework.
• D is incorrect because omitting DOCTYPE does not permanently disable CSS, although rendering behavior can change.

Congratulations!

You have completed Section 2 of Codementrix HTML5 Mastery. You now understand the structure of an HTML document, the purpose of DOCTYPE, metadata, character encoding, browser parsing and the DOM.

Next lesson: Section 3 — HTML Elements, Tags, Attributes and Nesting Rules.