39 interview questions on HTML5/CSS3 for developers (2025)

Hard

8 votes1908 runs1 comment

What is the HTML element that is used to group related content?

Web developer

html5

What is the `contenteditable` attribute in HTML5?

Web developer

html5

contenteditable

Jean-marie Cléryat Dec 2, 2021

Hard

8 votes1873 runs

2 comments

What are the two methods that can be used to send data to a server in HTML5?

Web developer

html5

http

Jean-marie Cléryat Dec 1, 2021

Hard

7 votes1911 runs0 comment

How to add a border to an image in HTML5

Web developer

html5

javascript

Jean-marie Cléryat Dec 2, 2021

Easy

7 votes1848 runs1 comment

How to create a navigation section in HTML5

Web developer

html

section

Jean-marie Cléryat Dec 1, 2021

Easy

7 votes1847 runs1 comment

What is the selector `nav a[href^=http://]`?

Web developer

html5

selectors

Jean-marie Cléryat Dec 1, 2021

Hard

6 votes1927 runs0 comment

What is the `<output>` element in HTML5?

Web developer

html5

form

Jean-marie Cléryat Dec 1, 2021

Hard

6 votes1913 runs1 comment

Calculate the vertical spacing between 2 paragraphs in HTML5

Web developer

html

css

Jean-marie Cléryat Feb 13, 2024

Easy

6 votes1894 runs1 comment

How to add a sandbox attribute to an iframe in HTML5

Web developer

iframe

sandbox

Jean-marie Cléryat Dec 1, 2021

Hard

5 votes1934 runs0 comment

How to select all images in HTML5 with CSS

Web developer

css

selectors

Jean-marie Cléryat Nov 29, 2021

Hard

5 votes1904 runs0 comment

Write a doctype for HTML5

Web developer

html5

doctype

Jean-marie Cléryat Dec 2, 2021

Easy

5 votes1877 runs1 comment

What is the default value of the justify-content property in HTML5?

Web developer

css

flexbox

Jean-marie Cléryat Nov 29, 2021

Hard

4 votes1948 runs1 comment

What is the name of the technology that allows you to cache data and serve it offline?

Web developer

service workers

Jean-marie Cléryat Dec 1, 2021

Medium

4 votes1921 runs0 comment

What is the name of the HTML5 element that is used to display a video?

Web developer

html5

video

Jean-marie Cléryat Dec 1, 2021

Hard

4 votes1910 runs2 comments

Which statements are true regarding the image management on this web page?

Web developer

html

images

Jean-marie Cléryat Mar 28, 2023

Easy

4 votes1868 runs0 comment

Explain the difference between `<video>` and `<object>` in HTML5.

Web developer

html5

video

Jean-marie Cléryat Dec 1, 2021

Hard

3 votes1930 runs0 comment

What are the two main ways to implement real-time communication in HTML5?

Web developer

event

eventsource

Jean-marie Cléryat Dec 1, 2021

Hard

3 votes1891 runs0 comment

What are the 4 CSS properties that are required to make a div element scrollable?

Web developer

css

html

Jean-marie Cléryat Dec 1, 2021

Hard

3 votes1882 runs0 comment

Explain the difference between localStorage and sessionStorage.

Web developer

security

cookies

Jean-marie Cléryat Dec 1, 2021

Hard

3 votes1881 runs0 comment

What is the name of the HTML5 feature that allows you to add metadata to an element?

Web developer

html5

data-attributes

Jean-marie Cléryat Dec 2, 2021

39 interview questions on HTML5/CSS3for developers (2025)

Test your technical skills before an interview of HTML5/CSS3 with 39 corrected questions. Beginner, Intermediate or Expert level.

What is the HTML element that is used to group related content?

What is the `contenteditable` attribute in HTML5?

What are the two methods that can be used to send data to a server in HTML5?

How to add a border to an image in HTML5

How to create a navigation section in HTML5

What is the selector `nav a[href^=http://]`?

What is the `<output>` element in HTML5?

Calculate the vertical spacing between 2 paragraphs in HTML5

How to add a sandbox attribute to an iframe in HTML5

How to select all images in HTML5 with CSS

Write a doctype for HTML5

What is the default value of the justify-content property in HTML5?

What is the name of the technology that allows you to cache data and serve it offline?

What is the name of the HTML5 element that is used to display a video?

Which statements are true regarding the image management on this web page?

Explain the difference between `<video>` and `<object>` in HTML5.

What are the two main ways to implement real-time communication in HTML5?

What are the 4 CSS properties that are required to make a div element scrollable?

Explain the difference between localStorage and sessionStorage.

What is the name of the HTML5 feature that allows you to add metadata to an element?

39 interview questions on HTML5/CSS3for developers (2025)

Test your technical skills before an interview of HTML5/CSS3 with 39 corrected questions. Beginner, Intermediate or Expert level.

What is the HTML element that is used to group related content?

What is the `contenteditable` attribute in HTML5?

What are the two methods that can be used to send data to a server in HTML5?

How to add a border to an image in HTML5

How to create a navigation section in HTML5

What is the selector `nav a[href^=http://]`?

What is the `<output>` element in HTML5?

Calculate the vertical spacing between 2 paragraphs in HTML5

How to add a sandbox attribute to an iframe in HTML5

How to select all images in HTML5 with CSS

Write a doctype for HTML5

What is the default value of the justify-content property in HTML5?

What is the name of the technology that allows you to cache data and serve it offline?

What is the name of the HTML5 element that is used to display a video?

Which statements are true regarding the image management on this web page?

Explain the difference between `<video>` and `<object>` in HTML5.

What are the two main ways to implement real-time communication in HTML5?

What are the 4 CSS properties that are required to make a div element scrollable?

Explain the difference between **localStorage** and **sessionStorage**.

What is the name of the HTML5 feature that allows you to add metadata to an element?

Explain the difference between localStorage and sessionStorage.