Introduction to UI Developer Interview Questions and Answers
UI developer plays a major role in developing a website as UI is the first one that lets users go inside a website. It is kind of a first impression. UI developer’s main role provides the user interface solution to the end-user (client, customers, or users) includes an outlook of the website, the feel, and behaviour of the user interface in different scenarios. We can say UI developer is a combination of web designer and web developer. The UI developer needs to consider different aspects while providing a user interface, such as the look and feel of an application’s user interface, functionality, and security. The UI developer needs to possess different skills such as knowledge of different languages such as CSS, HTML, JavaScript, Ajax, and HTTP etc., basic psychology, colour combination for the user interface, logical sorting etc.
UI developer is challenging role with multi-faces as it is responsible for the transference of a product from research, development, testing, content, and layout into an interface that looks and feels rich, with proper guidance and responsive experience to the end-user. With the user interface’s help, users and computer can interact with each other using this as a mediator to use input-output devices and software. UI Developer role is one of the hot cake job roles in the present market. We will have a look at the most asked or important interview questions for the UI developer role.
Now, if you are looking for a job related to UI Developer, you need to prepare for the 2021 UI Developer Interview Questions. Every interview is indeed different as per the different job profiles. Here, we have prepared the important UI Developer Interview Questions and Answers, which will help you succeed in your interview.
This 2021 UI Developer Interview Questions article will present the 10 most important and frequently used UI Developer interview questions. These questions are divided into two parts are as follows:
Part 1 – UI Developer Interview Questions (Basic)
This first part covers basic Interview Questions and Answers.
Q1. What is Semantic HTML?
Answer:
Semantic HTML is a coding style where the tags will contain how texts need to display on the user interface. Tags like bold, Italic should not be used along with semantic HTML as they represent formatting and doesn’t have any meaning or structure. The semantically correct thing is to use these tags to have the same effect as bold and italic, along with meaning and structure.
Q2. How absolute, relative, a static and fixed position will differ?
Answer:
This is the basic UI Developer Interview Question asked in an interview. Please find below the different tables that UI Developer supports are:
Absolute: It will place the element exactly where a user wants to place it. In general absolute will place relative to the parent. If no parent is available, then it is placed relative to the page itself.
Relative: It will place the element relative to itself (if we didn’t give any relative positioning); for example, if we set position relative to an element and given as top: 10px, then it will place the element 10px down from where the actual position of the element to be.
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Static: It will place the element according to the flow of the document. It uses the default position; if we want to remove any position, then we can use a static position to replace it.
Fixed: It will place the element relative to the browser window or viewport as viewport doesn’t change when scrolling. So element will be fixed at that position.
Q3. What is a responsive website?
Answer:
Any website is meant to be responsive when it looks good and fits in all types of screen resolution device types. In order to re-arrange the elements, display or hide the elements from the user interface, we can use CSS media queries to get things done.
Q4. What is the difference between inline, block and inline-block?
Answer:
Inline: In this thing, elements will follow the flow without breaking. Margin/padding will push other elements horizontally, not vertically, and inline elements ignore height and width.
Block: It breaks the line and doesn’t fit in the line. It usually has div, p, text, section etc.
Inline-block: It is similar to the inline element and follows the page flow. The only difference is that it will consider height and width.
Q5. Does HTML need a compiler?
Answer:
In general, HTML, CSS, and JavaScript have interpreted languages or browser interpreted technologies. In contrast, C, C++, asp.net, PHP have not interpreted languages, and they require a compiler that will convert their code into machine language. So HTML doesn’t need a compiler, and it is called a front-end language.
Part 2 – UI Developer Interview Questions (Advanced)
Let us now have a look at the advanced Interview Questions.
Q6. What is the difference between window and document?
Answer:
JavaScript uses a global object, and everything runs under it, which is called a window and a global object, which holds global variables, global functions, history and location under it. Along with it, Ajax, setTimeout, console and local storage are also under the window.
A document is also under the window as it is a property of the window object. The document represents the DOM represented in object-oriented representation for the HTML markup that the user has written and can get elements by getElementById, addEventListener on the document.
Q7. What is the difference between reset.css and normalize CSS?
Answer:
The difference between reset.css and normalize CSS is that reset.css removes all the built-in browser styling capabilities like margin, padding, and border. Whereas normalize CSS provides a book-like appearance that includes a bold family to represent characters, a border between two paragraphs and a common font-family for an entire page of the document.
Q8. What is web accessibility?
Answer:
Web accessibility is defined as providing access to the website for differently-abled or disabled people. Recently HTML5 introduced WAI-ARIA using which even differently-abled and disabled people can able to use the web, navigate, understand and interact with it.
Q9. What is JavaScript hoisting?
Answer:
This is the most asked UI Developer Interview Questions in an interview. In JavaScript, we need to declare the variables then only we able to access the variables. If a variable is defined at the bottom of the script but called before then, JavaScript throws variable is undefined. In JavaScript, only assigned variables are hoisted like string, numbers etc., undefined variables and functions are not hoisted as they need to define before calling.
Q10. Explain what is event bubbling and event capturing?
Answer:
Event propagation is the order of events that fire on the element. Bubbling is when an event is fired on the element then bubble up the DOM tree, i.e. child will call first, and then parent node will call, whereas capturing is opposite to the bubbling where the parent node is called first and then child node.
I hope you have prepared well for your interview, and I will assure you after reading this UI Developer Interview Questions article, you will have a better understanding of topics and preparation for the UI developer Interview. I wish you all the very best for your Interview preparation and Interview.
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