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
Sample Candidate Report
Sample Free Questions
Ensure
3min
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Easy
Easy
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CODE
JavaScript
Language
Public
JavaScript
JavaScript is the programming language of HTML and the web. It's an essential skill for any programmer working with websites and web technologies.
Language
A programmer should use a language as a tool, always taking advantage of language-specific data types and built-in functions.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
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.
Avatar
7min
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Easy
Easy
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CODE
HTML/CSS
CSS selectors
Styling
Public
HTML/CSS
HTML is the standard markup language for creating web pages. It's an essential skill for anyone creating web pages of any complexity.
CSS selectors
Selectors are a programming pattern that can be used to select an element from a container. They are primarily used in technologies such as CSS and jQuery to apply styles to groups of elements.
Styling
Styling user interfaces according to the specification is a daily routine for a front-end developer.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
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:
Focus
15min
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Easy
Easy
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CODE
React
Components
Public
New
React
React is a JavaScript library for building user interfaces. As one of the most widely used frameworks it's important for most JavaScript developers to have a working knowledge of.
Components
Components are used in many frameworks and languages as the building blocks of an application.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
New
This is a new addition to our question library.
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.
Premium Questions
The premium question library contains our unique, hand-crafted questions. We offer a refund if you find any of them answered online.
Questions
Link, Editor, Filter, Stopwatch, Blog, Label Color, Positive Numbers, Logo, Article Style, Share Button, Ad, Paragraph, Row Appender, Keywords, Hobbies, Links, Vectors, Username, Function Wrapper, Confirm, Double, 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, Cards, Format Table, Breakfast Menu, Cities, Screen Reader, Scale Font Size, New Folder, Log Patch, Timesheet, Loading Bar, Array Search, Validation, Height, Tab Strip, Contact Form, Data Entry, Email Form, Tooltip Component, Background Wrapper, Email Tables, TestDome Logo, Ice Cream Flavors, A Tag, Widgets, Upload, Reorder, Player Status, Simple Calculator, Theme Context Switcher, Toggle Options Visibility, Shopping List, Screen, Post Comment, Date Transform, SegmentSkills
HTML/CSSHTML/CSS
HTML is the standard markup language for creating web pages. It's an essential skill for anyone creating web pages of any complexity.
HTML attributes
HTML attributes provide extra information about HTML elements. They are used to add functionality and define behaviors of HTML documents.
JavaScript
JavaScript is the programming language of HTML and the web. It's an essential skill for any programmer working with websites and web technologies.
Arrays
An array is a container of a fixed number of objects of a similar type. It is a fundamental component of most programming languages.
Closures
Closures are an important concept in any programming language in which functions are first-class citizens.
HTML5
HTML5 is now supported in all modern browsers, making it important for front-end developers to know how to use its features.
Semantic tags
HTML5 introduced semantic tags, which can greatly improve the level of automated analysis that can be done on documents, as well as improve the readability of HTML.
CSS selectors
Selectors are a programming pattern that can be used to select an element from a container. They are primarily used in technologies such as CSS and jQuery to apply styles to groups of elements.
Positioning
Dynamic positioning of user interface elements depending on resolution is more important than ever in modern applications, making this important for a front-end developer.
Styling
Styling user interfaces according to the specification is a daily routine for a front-end developer.
Strings
The string data structure is used to represent text. It is one of the most commonly used data structures. Therefore, every programmer should be skilled at string manipulation.
DOM manipulation
Dynamically accessing and updating user interface elements is an important part of most modern web applications.
Language
A programmer should use a language as a tool, always taking advantage of language-specific data types and built-in functions.
Iteration
Iteration is the act of repeating a process, or cycling through a collection. Iteration is one of the fundamental flow control tools available to developers.
Arithmetic
Arithmetic is a fundamental branch of mathematics. An understanding of arithmetic concepts, and their application, is important for every candidate.
Searching
Every programmer should be familiar with data-searching methods, as they are very common in data-analysis processes.
Exceptions
Exceptions exist in most modern programming languages, making it important for a programmer to understand them and know how to handle them.
Event handling
Event-based design patterns are very common in modern applications, especially in the development of user interfaces.
CSS advanced
Cascading Style Sheets are the styling language of the web. Knowledge about advanced CSS features is required for seasoned front-end developers.
Serialization
Familiarity with data serialization to and from formats such as XML and JSON is important as it is commonly used for interprocess communication
Sorting
Every programmer should be familiar with data-sorting methods, as sorting is very common in data-analysis processes.
Animation
Animation is the process in which images or objects are manipulated to appear as if they are moving. It's a powerful effect that is important for UI designers to understand and be able to use.
Selectors
Selectors are a programming pattern that can be used to select an element from a container. They are primarily used in technologies such as CSS and jQuery to apply styles to groups of elements.
Accessibility
Accessibility refers to the design of products, devices, services, or environments for people who experience disabilities. It's important for all designers and developers to know how to optimize for people who experience disabilities.
Monkey patching
Monkey Patching is a method of either adding new or overriding existing functionality without the creation of a new type. As such it's an important tool for developers to be familiar with.
Tables
A table stores data as rows and columns. From databases to HTML layouts, as a data structure they are ubiquitous. They are an important structure for developers to understand and know how to use.
Recursion
A good programmer should be familiar with when to use recursive functions, since they can provide elegant solutions for complex problems.
React
React is a JavaScript library for building user interfaces. As one of the most widely used frameworks it's important for most JavaScript developers to have a working knowledge of.
Components
Components are used in many frameworks and languages as the building blocks of an application.
Conditional rendering
Conditional rendering in React is rendering different components depending on the application state. It is commonly used and, as such, is important for all developers.
CSS layout
Cascading Style Sheets are the styling language of the web. For a front-end developer, a knowledge of CSS layouts is required.
Forms
Forms provide a method of grouping inputs and collecting user data. As such, they are important for all front end developers.
Portals
Portals are a first-class way to render children into a DOM node that exists outside the DOM hierarchy of the parent component. As such, they are a very convenient tool for all developers who need to interact with a virtual DOM.
VDOM
Many modern web frameworks provide a virtual DOM that can be used to improve performance and maintainability of large web applications - as such, it's important for web developers to have a solid understanding of how to interact with both the VDOM and DOM.
CSS basics
Cascading Style Sheets are the styling language of the web. Any good front-end developer requires a knowledge of basic CSS features.
HTML
HTML or Hypertext Markup Language is the standard markup language used to design web pages to be displayed in a web browser. It is the basic building block of the web.
Effect Hook
Using a React Effect Hook allows you to set up a subscription to DOM changes and perform side effects.
State Hook
Using a React State Hook allows you to preserve state between re-renders in a manner that doesn't require render props and higher-order components patterns, which simplifies code.
Hooks
Many frameworks allow developers to add their own plugins and extensions. Hooks are the points within the framework that the developer can access to implement their own logic and designs.
Reducer Hook
Using a React Reducer Hook allows you to pass callbacks with values between components, which simplifies code by removing the need to pass callbacks through every level of a component tree.
Context
React Context provides a way to pass data without using props through every level of the tree.
Data binding
Data binding is a technique for synchronizing data between a component and DOM. For this reason, it’s important for all web developers.
Managing state
Knowing how to overcome statelessness, the intrinsic limitation of web programming, is a very important skill for a web developer.
Bug fixing
Everyone makes mistakes. A good programmer should be able to find and fix a bug in their or someone else's code.
Classes
A class is one of the most widely used and primary structures used in object-oriented programming. As such it's important for any developer to have a working knowledge of how to use it.
ECMAScript 2015
ECMAScript 2015 adds a significant number of features to JavaScript, including classes, modules and range based loops. As such it's important for any JavaScript developer to understand.
Score Distribution
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