Front End Developer Mock Interview

Practice 30 Front End Developer interview questions covering HTML, CSS, JavaScript, frameworks, and performance optimization.

Question 17 of 30

Describe what CSS selector specificity is and how it works?

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William Swansen

William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.

This technical question asks you about a specific topic within the purview of a front-end developer's job. Many of the questions you will be asked during an interview will be technical. To prepare for these, you should review the terminology, processes, and concepts used in this profession to be familiar with them. You can also practice questions like this so you'll know how to format your answers. As with any question, you should be prepared for a follow-up if the interviewer wants to explore the topic in more detail.

William Swansen

"A CSS selector is used to find the HTML elements you want to style. When using a CSS selector, specificity occurs if two or more CSS rules point to the same element. The browser will select the rule that is more specific in defining the HTML element. This is based on a score created by the CSS selector."

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30Front End Developer Interview Questions & Answers

Front End Developer

1.What methodologies do you use to ensure that your web application is user-friendly?

Front End Developer

2.Please discuss CSS float and give me an example of how you use it when developing web sites.

Front End Developer

3.How do you increase the performance of a new web site you develop?

Front End Developer

4.How do you use a closure when you are writing front end code?

Front End Developer

5.What features of HTML5 have you implemented in your front end development projects?

Front End Developer

6.How do you go about addressing browser-specific rendering challenges?

Front End Developer

7.Please discuss the difference between null, undefined or undeclared variables.

Front End Developer

8.Tell me about the SEO best practices or techniques you use in your work.

Front End Developer

9.Can you explain how prototypal inheritance works?

Front End Developer

10.When working on a web development project, what do you do to improve your code's maintainability?

Front End Developer

11.How has working with the 'this' keyword changed in JavaScript ES6?

Front End Developer

12.Can you explain the techniques you use to ensure front-end security?

Front End Developer

13.What version control systems have you worked with?

Front End Developer

14.Can you define Block Formatting Context and describe how it works?

Front End Developer

15.Walk me through your workflow when you are creating a web page.

Front End Developer

16.Talk to me about z-index and how stacking context is formed.

Front End Developer

17.Describe what CSS selector specificity is and how it works?

Front End Developer

18.What are floats, and how they work?

Front End Developer

19.Can you compare progressive enhancement and graceful degradation?

Front End Developer

20.How would you integrate several different stylesheets into a website?

Front End Developer

21.Which technique do you prefer to use, resetting or normalizing CSS, and why?

Front End Developer

22.Can you describe Ajax and discuss what it is used for?

Front End Developer

23.Please describe what the acronym NPM stands for and how it is used in front end development.

Front End Developer

24.What is Representational State Transfer, or REST, and how would you use it when developing a front end for a website?

Front End Developer

25.Can you discuss the differences between session storage, cookies, and local storage?

Front End Developer

26.Our web development team uses JSONP. Are you familiar with this, and do you use it in your web development?

Front End Developer

27.Can you provide men an overview of the Delegation Event Model?

Front End Developer

28.Please discuss the differences between the call, apply and bind commands?

Front End Developer

29.What does the acronym CORS stand for, and what programming issue does it help resolve?

Front End Developer

Front End Developer Mock Interview

Describe what CSS selector specificity is and how it works?

30Front End Developer Interview Questions & Answers

1.What methodologies do you use to ensure that your web application is user-friendly?

2.Please discuss CSS float and give me an example of how you use it when developing web sites.

3.How do you increase the performance of a new web site you develop?

4.How do you use a closure when you are writing front end code?

5.What features of HTML5 have you implemented in your front end development projects?

6.How do you go about addressing browser-specific rendering challenges?

7.Please discuss the difference between null, undefined or undeclared variables.

8.Tell me about the SEO best practices or techniques you use in your work.

9.Can you explain how prototypal inheritance works?

10.When working on a web development project, what do you do to improve your code's maintainability?

11.How has working with the 'this' keyword changed in JavaScript ES6?

12.Can you explain the techniques you use to ensure front-end security?

13.What version control systems have you worked with?

14.Can you define Block Formatting Context and describe how it works?

15.Walk me through your workflow when you are creating a web page.

16.Talk to me about z-index and how stacking context is formed.

17.Describe what CSS selector specificity is and how it works?

18.What are floats, and how they work?

19.Can you compare progressive enhancement and graceful degradation?

20.How would you integrate several different stylesheets into a website?

21.Which technique do you prefer to use, resetting or normalizing CSS, and why?

22.Can you describe Ajax and discuss what it is used for?

23.Please describe what the acronym NPM stands for and how it is used in front end development.

24.What is Representational State Transfer, or REST, and how would you use it when developing a front end for a website?

25.Can you discuss the differences between session storage, cookies, and local storage?

26.Our web development team uses JSONP. Are you familiar with this, and do you use it in your web development?

27.Can you provide men an overview of the Delegation Event Model?

28.Please discuss the differences between the call, apply and bind commands?

29.What does the acronym CORS stand for, and what programming issue does it help resolve?

30.Are you familiar with the term CoffeeScript, and do you know how it is used in front end web development?