<head> or <body> sections?
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.
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 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
Which scenario is suitable for placing JavaScript in the <head> section of an HTML document?
A). Initializing variables or configurations.
B). Dynamic content manipulation.
C). User interaction scripts.
D). External script loading.
Placing JavaScript in the <head> section can impact page load times because:
A). It blocks rendering until executed.
B). It loads scripts asynchronously.
C). It reduces HTTP requests.
D). It has no impact on loading.
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.
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.
What is the advantage of placing JavaScript at the end of the <body> section for non-critical scripts?
A). Faster initial page rendering.
B). Slower page load overall.
C). Better script execution order.
D). Increased script complexity.
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.
Variables declared in the <body> section of an HTML document have what scope by default?
A). Local to the script or function.
B). Global throughout the document.
C). Limited to the <body> section.
D). Not accessible in JavaScript.