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40 interview questions on HTML5/CSS3for developers (2025)

Test your technical skills before an interview of HTML5/CSS3 with 40 corrected questions. Beginner, Intermediate or Expert level.

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Hard
10 votes2053 runs1 comment

What is the `contenteditable` attribute in HTML5?

Web developer
html5
contenteditable
Jean-marie Cléryat Dec 2, 2021
Hard
9 votes2056 runs1 comment

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

Web developer
html5
tags
Jean-marie Cléryat Dec 1, 2021
Hard
9 votes2031 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
Easy
9 votes1997 runs1 comment

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

Web developer
html5
selectors
Jean-marie Cléryat Dec 1, 2021
Hard
8 votes2085 runs0 comment

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

Web developer
html5
form
Jean-marie Cléryat Dec 1, 2021
Hard
8 votes2072 runs0 comment

How to add a border to an image in HTML5

Web developer
html5
javascript
Jean-marie Cléryat Dec 2, 2021
Easy
8 votes2020 runs1 comment

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

Web developer
css
flexbox
Jean-marie Cléryat Nov 29, 2021
Easy
8 votes1994 runs1 comment

How to create a navigation section in HTML5

Web developer
html
section
Jean-marie Cléryat Dec 1, 2021
Hard
7 votes2112 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
7 votes2080 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
6 votes2103 runs0 comment

How to select all images in HTML5 with CSS

Web developer
css
selectors
Jean-marie Cléryat Nov 29, 2021
Hard
6 votes2076 runs1 comment

Calculate the vertical spacing between 2 paragraphs in HTML5

Web developer
html
css
Jean-marie Cléryat Feb 13, 2024
Hard
6 votes2066 runs2 comments

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

Web developer
html
images
Jean-marie Cléryat Mar 28, 2023
Hard
6 votes2065 runs0 comment

Write a doctype for HTML5

Web developer
html5
doctype
Jean-marie Cléryat Dec 2, 2021
Hard
5 votes2081 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
Easy
5 votes2041 runs
2 comments

How to add a sandbox attribute to an iframe in HTML5

Web developer
iframe
sandbox
Jean-marie Cléryat Dec 1, 2021
Hard
5 votes2031 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
Easy
5 votes2028 runs0 comment

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

Web developer
html5
video
Jean-marie Cléryat Dec 1, 2021
Hard
5 votes2020 runs0 comment

Differences between SVG and Canvas

Web developer
html5
svg
canvas
Jean-marie Cléryat Dec 2, 2021
Hard
3 votes2051 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