Front End Development Front-End Development Course 3

Question 1

Which JavaScript method returns a new array with only the elements that pass a test function?

Accepted Answer

filter()

Answer

filter() creates a new array containing all elements for which the callback returns a truthy value.

Question 2

What is the purpose of the `alt` attribute on an `<img>` tag?

Accepted Answer

Provides alternative text for accessibility and when the image fails to load

Answer

The alt attribute supplies descriptive text for screen readers and displays as fallback text when the image cannot be rendered.

Question 3

Which CSS unit is relative to the font size of the root element?

Accepted Answer

rem

Answer

rem (root em) is always relative to the font size of the <html> element, making it predictable unlike em which cascades.

Question 4

In JavaScript, which statement correctly declares a block-scoped variable?

Accepted Answer

let x = 5;

Answer

let declares a variable with block scope, meaning it is only accessible within the enclosing {} block.

Question 5

What does CORS stand for in web development?

Accepted Answer

Cross-Origin Resource Sharing

Answer

CORS is a browser security mechanism that controls how web pages can request resources from a different domain than the one that served the page.

Front End Development Practice Test