UI Developer Interview Questions and Answers for 2021

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UI Developer Interview Questions and Answers

Looking for UI developer interview questions? You are on the right page here I will share tons of most asked questions in interviews. I will share a question for Freshers, Intermediate, experienced.

UI designer ranks third on this list of the 19 most in-demand digital creative talent, so surely there is a lot of potential as a UI developer for you.

It’s a job seeker’s market for UI developer or designer occupations, but even so, it’s essential to make the best first impression during an interview. After all, you not only need to impress the interviewer with your knowledge, you also need to show why you’re apart from the pack in a class by yourself.

Let’s start with basic questions and work up to the more advanced ideas. Let’s go.

Basics Questions: UI developer interview questions for freshers

What exactly is the role of a UI developer?

Role of a UI developer
Role of a UI developer

UI is every detail that users can control or interact with (Buttons, Cards, notices, etc.) across different devices such as smartphones, desktop computers, laptops, tablets, and other mobile technology. The UI designer or developer’s role is to create the best, most convenient interface that meets the users’ needs.

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What’s the difference between UI developer and UX developer?

UI developer is responsible for designing the visual, interactive elements, something that users navigate their way through the product. A user experience (UX) developer creates and improves the quality of a user’s interaction with both the company and its product. If UI and UX were part of the human body, UI would be the skin and appearance, while UX would be the internal organs.

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What’s the difference between UI developers and front-end developers?

Front-end developers create the client-side of a web interface, making sure it functions properly, such as making sure all of the website’s elements work. The UI developer makes everything on the site is user-friendly and looks good.

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What kind of skills do you think are crucial for a successful UI developer?

UI developers must have skills in visual design (including animation and interactive elements), prototyping platforms, and front-end frameworks. A good UI developer knows HTML, CSS, JS, and—though it’s not mandatory—Photoshop.

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What is meant by a responsive website?

Responsive website
Responsive website

Any website that means to be responsive, when it fits any system screen resolution device types, looks good at any size, and understandable to the user. 

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How can we reduce the page’s load time?

We reduce the page’s load time by the following things:

  • Remove unnecessary widgets or elements
  • Minimizing the redirects
  • and reduce image sizes.
  • File concatenation 
  • CDN Hosting
  • offloading assets
  • re-organizing and refining code
  • etc.

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What is HTML?

HTML stands for HyperText Markup Language. HTML is the most popular markup language for creating websites, as well as any elements viewed in a web browser.

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What is Semantic HTML?

Semantic HTML, it’s HTML that uses tags to embody what the text is trying to convey. In other words, it brings meaning and a presentation to a webpage. This is also known as semantic markup.

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Intermediate Questions: UI developer interview questions for Intermediate

Difference between display none and visibility hidden?

Visibility: hidden hide the content from the user but retain space. Whereas Display: none hide the content and remove space.

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How to test website performance.

Web-page load time
Web-page load time

Website performance plays a major role. As per Google Lighthouse. We can check it via tools like Google Page Insights, the performance of a website is excellent if its loading time is under 2 seconds. A website is fair if the loading time is 3 to 5 seconds. But a website is poor if the loading time is more than 5 seconds.

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What’s the difference between the <b> and <strong> tags.

<b> is explicit – they specify bold and italic respectively however <strong> is semantic – they specify that the enclosed text should be “strong” or “emphasized” in some way, usually bold and italic, but allow for the actual styling to be controlled via CSS. Hence these are preferred in modern web pages.

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Difference between <i> and <em> tag?

<i> is a presentational element used to give italic look to text. Whereas <em> gives italic look and emphasis in search results.

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What kind of things must you be wary of when the design or developing for multilingual sites?

Setting the default language, using Unicode encoding, using the ‘lang’ attribute, being aware of standard font sizes and text direction, and language word length (may affect layout).

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Difference between <article> and <section> tag?

Article and section are both Semantic elements in HTML5.

The article is used for independent content with the heading, like a Blog post, Review, etc.

A section is used for a generic section of a page. Both Article and section must include a heading or subheading.

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Discuss the differences between this quartet of position properties: Relative, Absolute, Static, and Fixed.

Relative moves an element concerning its current position. Absolute moves an element concerning its current position or the parent element’s position. Absolute elements don’t occupy space in DOM flow. Static is the default position. Fixed gives an element a fixed position relative to the device screen. None of these elements move during scrolling.

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What is web accessibility?

Web accessibility provides website access for differently-abled and disabled persons so that they can easily understand, navigate, and interact with the website.

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What’s the difference between HTML and XHTML?

Although both languages create web pages, HTML is a “Hyper text markup language”, whereas XHTML is an “Extensible hypertext markup language”. XHTML is XML based, while HTML is SGML based. XHTML is strict compared to HTML and doesn’t allow users to get away with any coding or structure lapses.

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Differences between local storage, session storage, and cookies.

Local storage allows data storage with no expiration date and offers the most substantial maximum storage limit.

Session storage stores the data associated with a session. When the user closes the tab or browser, the data disappears.

Cookies are reserved mostly for server-side reading, storing data sent back to the server. The data size must be less than 4KB.

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Discuss the differences between a document and a window in JavaScript.

A window object has properties such as inner width, inner height, length, whether it was previously closed, its parent, and its name. The window is the first thing loaded into the browser.  The document object is defined as any document that gets loaded inside the window object, such as HTML, ASPX, or PHP, and has properties such as cookies, title, and URL, to name a few.

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Does HTML require a compiler?

Since it’s a front-end language, HTML doesn’t need a compiler. However, languages such as C, C+, and Java require a compiler to convert the code into a language that a machine can comprehend.

Is JavaScript Case Sensitive?

Yes, JavaScript is case-sensitive. But HTML and CSS are not.

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Advance Questions: UI developer interview questions for experienced

What is Meta Viewport?

Apple introduced Meta Viewport first in safari to adjust viewport size in IOS. Soon other mobile browsers start supporting the same rule. Although it’s non-standard, still works on all browsers.

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What is the difference between HTML elements and tags?

HTML elements communicate to the browser how to render text. When surrounded by angular brackets <> they form HTML tags. For the most part, tags come in pairs and surround the text.

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What is JavaScript Hoisting?

JavaScript Hoisting
JavaScript Hoisting

Hoisting is a mechanism where assigned variables and function declarations get moved or “hoisted” to the top of their scope before executing code. Therefore, no matter where functions and variables are declared, they get moved to the top of their range regardless of whether their scope is local or global.

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What are the limitations when serving XHTML pages?

Perhaps the biggest issue is the poor browser support XHTML currently enjoys. Internet Explorer and several other user agents cannot parse XHTML as XML. Thus, it is not the extensible language it was promised to be.

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How does float work?

Float property pushes the element to the left or right. The float property can have one of four values:

  1. Inherited: The element inherits the parent’s float value
  2. None: This is the default value; the element doesn’t float
  3. Left: The element floats to the container’s left
  4. Right: The element floats to the container’s right

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Name at least three plugins available in the Bootstrap jQuery plugin library.

Answers include:

  • Alert
  • Affix
  • Button
  • Carousel
  • Collapse
  • Dropdown
  • Modal
  • Popover
  • Scrollspy
  • Tab
  • Tooltip

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Using the latest version of Bootstrap, what CSS class does you employ to span 14 columns on medium-sized screens, and eight columns on large screens?

class=”col-md-14 col-lg-8”

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What is a CSS reset, and how does it differ from normalize.css?

Reset.css eliminates all browser default styles, such as margin, padding, and border. Normalize.css sets a standard book-like appearance (e.g., bold headings, margins between two paragraphs, common font) across all browsers. However, it doesn’t reset them.

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What’s an AJAX request, and how would an AJAX request be used?

AJAX is an acronym for asynchronous JavaScript and XML and is a client-side process written in JavaScript. It is used to get or post data from a remote server without needing to reload the page.

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What are vendor-specific prefixes like WebKit?

Vendor-specific prefixes are used mainly with CSS3 properties to run them in all browsers. Chrome, Edge, Safari, and Firefox use the WebKit engine. But earlier firefox use -Moz prefix, opera use -o prefix, and Internet Explorer support -ms prefix. For the latest browsers, only WebKit is required now.

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Which is the best HTML debugging tool.

I use Chrome, Firefox, and firebug (included in Firefox now) Dev tools as they are browser inbuilt. But W3C Validation is the best HTML/CSS Debugging tool to validate.

How do you use HTML5 new tags in IE version eight and earlier?

That’s a trick question, because HTML5 semantic tags like the article, aside, footer, header, nav, and section, are not supported by HTML4-based browsers, and that includes IE8. However, you can use html5shiv.js to run these elements in older browsers.

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Let me know if i forget any of your favorite UI Developer Interview Questions.

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