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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.

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39 questions
Hard
9 votes1943 runs1 comment
Hard
9 votes1908 runs
2 comments
Easy
9 votes1880 runs1 comment

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

Web developer
html5
selectors
Jean-marie Cléryat Dec 1, 2021
Hard
8 votes1932 runs1 comment

What is the `contenteditable` attribute in HTML5?

Web developer
html5
contenteditable
Jean-marie Cléryat Dec 2, 2021
Easy
8 votes1889 runs1 comment

How to create a navigation section in HTML5

Web developer
html
section
Jean-marie Cléryat Dec 1, 2021
Hard
7 votes1966 runs0 comment

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

Web developer
html5
form
Jean-marie Cléryat Dec 1, 2021
Hard
7 votes1950 runs0 comment

How to add a border to an image in HTML5

Web developer
html5
javascript
Jean-marie Cléryat Dec 2, 2021
Medium
6 votes1960 runs0 comment
Hard
6 votes1948 runs1 comment
Hard
6 votes1943 runs0 comment

Write a doctype for HTML5

Web developer
html5
doctype
Jean-marie Cléryat Dec 2, 2021
Easy
6 votes1930 runs1 comment

How to add a sandbox attribute to an iframe in HTML5

Web developer
iframe
sandbox
Jean-marie Cléryat Dec 1, 2021
Easy
6 votes1914 runs1 comment
Hard
5 votes1987 runs1 comment
Hard
5 votes1976 runs0 comment

How to select all images in HTML5 with CSS

Web developer
css
selectors
Jean-marie Cléryat Nov 29, 2021
Hard
5 votes1965 runs0 comment
Hard
5 votes1950 runs2 comments
Hard
4 votes1915 runs0 comment
Easy
4 votes1906 runs0 comment
Hard
3 votes1927 runs0 comment
Hard
3 votes1923 runs0 comment