W3Schools Certification Practice Quiz

1. What is the correct syntax to declare a variable in modern JavaScript?

Var x = 5;

Let x = 5;

Both var and let are correct

Variable x = 5;

2. What is the correct way to write a CSS class selector?

#classname

.classname

Classname

:classname

3. Which of the following is NOT a valid HTML5 input type?

Email

Date

Calendar

Range

4. In CSS, what property controls the space between an element's border and its content?

Margin

Padding

Border-spacing

Gap

5. Which JavaScript method converts a JSON string into a JavaScript object?

JSON.stringify()

JSON.parse()

Object.create()

JSON.convert()

6. What does the 'async' attribute do in a script tag?

Loads the script synchronously

Loads the script asynchronously without blocking HTML parsing

Delays script execution until the page loads

Makes the script run multiple times

7. In CSS Grid, what property defines the space between grid cells?

Grid-spacing

Gap

Margin

Border-spacing

8. Which HTTP method is used to retrieve data from a server without modifying it?

POST

PUT

GET

DELETE

9. In JavaScript, what keyword is used to create a function that returns a value automatically?

Function

Arrow

Both function and arrow functions work

Method

10. What is the purpose of the 'viewport' meta tag in HTML?

Controls page styling

Ensures responsive design on mobile devices

Manages browser cache

Sets page background color

11. What does the 'defer' attribute do when used in a script tag?

Loads script immediately

Executes script after HTML parsing is complete

Prevents script execution

Runs script in the background

12. Which CSS property is used to create a flexible layout system?

Grid

Flexbox

Float

Position

13. In CSS, which property determines how an element is positioned in the document?

Display

Position

Align

Layout

14. Which JavaScript array method returns a new array with elements that pass a test?

Map()

Filter()

Reduce()

ForEach()