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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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40 questions
Hard
10 votes2008 runs1 comment

What is the `contenteditable` attribute in HTML5?

Web developer
html5
contenteditable
Jean-marie Cléryat Dec 2, 2021
Hard
9 votes2009 runs1 comment
Hard
9 votes1990 runs
2 comments
Easy
9 votes1951 runs1 comment

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

Web developer
html5
selectors
Jean-marie Cléryat Dec 1, 2021
Hard
8 votes2040 runs0 comment

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

Web developer
html5
form
Jean-marie Cléryat Dec 1, 2021
Hard
8 votes2027 runs0 comment

How to add a border to an image in HTML5

Web developer
html5
javascript
Jean-marie Cléryat Dec 2, 2021
Easy
8 votes1954 runs1 comment

How to create a navigation section in HTML5

Web developer
html
section
Jean-marie Cléryat Dec 1, 2021
Hard
7 votes2067 runs1 comment
Medium
7 votes2033 runs0 comment
Hard
6 votes2057 runs0 comment

How to select all images in HTML5 with CSS

Web developer
css
selectors
Jean-marie Cléryat Nov 29, 2021
Hard
6 votes2027 runs1 comment
Hard
6 votes2022 runs0 comment

Write a doctype for HTML5

Web developer
html5
doctype
Jean-marie Cléryat Dec 2, 2021
Hard
6 votes2019 runs2 comments
Easy
6 votes1983 runs1 comment
Hard
5 votes2035 runs0 comment
Easy
5 votes2000 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 votes1982 runs0 comment
Easy
5 votes1982 runs0 comment
Hard
4 votes1974 runs0 comment

Differences between SVG and Canvas

Web developer
html5
svg
canvas
Jean-marie Cléryat Dec 2, 2021
Hard
3 votes2004 runs0 comment