<head> or <body> sections?
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
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.
Using the defer attribute with an external script in the <head> 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 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.
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.
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.
When using an external JavaScript file in the <head> section with the defer attribute, when does it get executed?
A). After the HTML content is fully parsed.
B). Before the HTML content is parsed.
C). As soon as it starts loading.
D). After all other scripts in the <head>.
What is the purpose of using the async attribute with an external JavaScript file?
A). To load the script asynchronously.
B). To defer script execution.
C). To block rendering until script loads.
D). To ensure script execution order.
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.
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