Q
When using an external JavaScript file in the <head> section with the defer attribute, when does it get executed?

Answer & Solution

Answer: Option A
Solution:
An external JavaScript file in the <head> with the defer attribute gets executed after the HTML content is fully parsed, ensuring that it doesn't block rendering or delay the display of core page content to users.
Related Questions on Average

Using the defer attribute with an external JavaScript file in the <body> section means that the script:

A). Loads and executes after HTML parsing.

B). Loads synchronously with HTML parsing.

C). Loads and executes before HTML parsing.

D). Loads but doesn't execute.

What happens if JavaScript code in the <body> section of an HTML document is placed before critical content such as headings or main paragraphs?

A). It may cause FOUC (Flash of Unstyled Content).

B). It has no effect on page rendering.

C). It improves page load speed.

D). It slows down script execution.

Variables declared in the <head> section of an HTML document are accessible:

A). Globally throughout the document.

B). Only within the <head> section.

C). Only after the page has fully loaded.

D). Nowhere in the document.

What happens if JavaScript code in the <head> section of an HTML document is not properly handled?

A). It may block rendering and cause delays.

B). It automatically moves to the <body>.

C). It gets executed twice.

D). It has no impact on the page.

When JavaScript is placed in the <head> section of an HTML document, it can:

A). Execute before page rendering.

B). Execute after page rendering.

C). Block rendering until execution.

D). None of the above.

How can JavaScript be loaded asynchronously in the <body> section without blocking page rendering?

A). Using the defer attribute.

B). Using the async attribute.

C). Including scripts in the <head>.

D). Not possible in the <body>.

Which attribute should be used for loading external JavaScript files without blocking rendering in the <head> or <body> sections?

A). async

B). defer

C). sync

D). load

Which of the following is a recommended practice for optimizing JavaScript performance?

A). Minify and concatenate scripts.

B). Include all scripts in the <head>.

C). Use synchronous loading for all scripts.

D). Load scripts without optimization.

Which attribute is used to make an external JavaScript file load and execute after HTML parsing but before the DOMContentLoaded event in the <head> section?

A). async

B). defer

C). sync

D). load

What is the purpose of using the async attribute with an external JavaScript file in the <head> section?

A). To load and execute the script after HTML parsing.

B). To defer script execution.

C). To block rendering until script loads.

D). To ensure script execution order.

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