HTML/CSS, JavaScript, and React Online Test

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The HTML/CSS, JavaScript, and React online test assesses candidates' knowledge of HTML, CSS , JavaScript, and React as well as their ability to combine those technologies and take advantage of commonly used parts of Bootstrap.

It's an ideal test for pre-employment screening. A good front-end developer should be able to combine HTML, CSS, JavaScript, and React to create a dynamic and interactive user interface.

This online test requires candidates to solve common HTML/CSS, JavaScript, and React coding problems.

Recommended Job Roles

JavaScript Developer

React Developer

UI/UX Developer

Web Front-End Developer

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Sample Free Questions

Ensure

3min

Easy

CODE

JavaScript Language Public

Implement the ensure function so that it throws an error if called without arguments or the argument is undefined. Otherwise it should return the given value.

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Avatar

7min

Easy

CODE

HTML/CSS CSS selectors Styling Public New

Every user on your website has an image avatar that is displayed when they post a comment. You want to style these images differently from other images on your site. Add a CSS class named avatar that fulfils the following requirements:

The avatar's border is rounded, so that it appears as a circle.
The avatar's width and height are both 150px.
The avatar has a solid border, has a width of 2px, and be colored gray.

For example, the avatar in the template should look like:

Cat avatar

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Focus

15min

Easy

CODE

React Components Public New

The TextInput component renders an input element in the DOM and accepts a ref that is forwarded to that input element. Finish the FocusableInput component:

The component should accept a focused prop.
When the focused prop is changed from false to true, and the input is not focused, it should receive the focus.
If on mounting the focused prop is true, the input should receive the focus.

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Premium Questions

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Questions

Link, Editor, Filter, Stopwatch, Blog, Label Color, Height, Widgets, Positive Numbers, Logo, Article Style, Share Button, Ad, Paragraph, Post Comment, Row Appender, Keywords, Hobbies, Links, Vectors, Username, Function Wrapper, Confirm, Double, Reorder, Hide Button, Truthy Expressions, Addition, Bookmark, Christmas Tree, iframe, Product Rating, Products, Shirts, Snapshot, Table of Names, Warehouse, Word Count, Baby Names, Loading, Log Parser, Date Transform, Cards, Format Table, Breakfast Menu, Cities, Screen Reader, Scale Font Size, New Folder, Log Patch, Timesheet, Segment, Background Wrapper, Loading Bar, Tooltip Component, Contact Form, Tab Strip, Validation, Upload, Screen, A Tag, Email Form, Array Search

Skills

HTML/CSS HTML attributes JavaScript Arrays Closures HTML5 Semantic tags CSS selectors Arithmetic Language Positioning Styling Strings DOM manipulation Event handling Iteration Searching Exceptions CSS Advanced Serialization Sorting Animation Selectors Accessibility Monkey Patching Tables React VDOM Portals Conditional Rendering Components Bug fixing Classes ECMAScript 2015 Recursion

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