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The ultimate guide to web development interviews. Developed by FAANG engineers, practice with real-world interview questions covering network security, system design, SEO, APIs, and more.

oct6.tar.gz

server

JavaScript

Grunt

webpack

webpack-loaders

Grunt-eslint

ProgressiveRendering

webpack-code-splitting

This course compiles a comprehensive range of questions that are most likely to be asked during the frontend interview. Where many interview prep courses focus on data structures and algorithms, this course focuses on a variety of topics from network security to system design.

In this course, you will solve interview questions that cover general aspects of web development. You’ll start by going over network security and optimization techniques for load balancing and browser rendering. After that, you’ll move on to interview questions around SEO, APIs, and system design.

Overall, these are questions that are often overlooked, but they can really make you stand out from your peers. By the end of this course, you will have the confidence and ability to go in and ace that interview.

Web Development Interview Handbook

The rate at which a device can produce images or frames


A common measure for website performance


A low and inconsistent frame rate may cause the website to ‘miss frames,’ resulting in stuttering and a lack of smoothness. This ‘stuttering’ is called jank.


A JavaScript term for running smooth animations on websites.

A high and consistent frame rate may cause the website to ‘over perform’ because not all devices support very high frame rates. This is called jank.

Which of the following best describes jank?

Which of the following best describes jank?

What is a good target frame rate?

No, the website seems to be working perfectly.

Yes, I can tell by the red triangle on the ‘timer fired’ task. It seems to be taking too long. Particularly, the recurring handler is taking too long.


Yes, there is a timer firing. Timers should never be used, as they cause performance bottlenecks.


Consider the following screenshot. Is there a performance problem? How do you know? If so, what is it?
<center>
<img src="/api/collection/10370001/6006542571667456/page/4772613497815040/image/5405919276957696" style="max-width:auto;max-height:250px;width: auto;height: auto;">
</center>

Consider the following screenshot. Is there a performance problem? How do you know? If so, what is it?
<center>
<img src="/api/collection/10370001/6006542571667456/page/4772613497815040/image/5405919276957696" style="max-width:auto;max-height:250px;width: auto;height: auto;">
</center>

Start searching through all the files in the code repository for my website on GitHub to see if I can optimize something.

Go to the Summary tab and see if I can find the line of code that was causing this problem.


This question relates to the previous question. What next steps would you take to remedy the problem here?
<center>
<img src="/api/collection/10370001/6006542571667456/page/4772613497815040/image/5405919276957696" style="max-width:auto;max-height:250px;width: auto;height: auto;">
</center>

This question relates to the previous question. What next steps would you take to remedy the problem here?
<center>
<img src="/api/collection/10370001/6006542571667456/page/4772613497815040/image/5405919276957696" style="max-width:auto;max-height:250px;width: auto;height: auto;">
</center>

Yes, it will be smooth because a frame renders every 60 seconds, which is a good rate.


No, it will not be smooth because the fps is 15, when it should be at least 60.


No, it will not be smooth because 60 frames are rendering each second, which is not enough.


Consider the following screenshot of the Performance tab in Chrome developer tools. Will the animation on the page be smooth? Why or why not?

<center>
<img src="/api/collection/10370001/6006542571667456/page/4772613497815040/image/4712519489814528" style="max-width:auto;max-height:250px;width: auto;height: auto;">
 </center>

Consider the following screenshot of the Performance tab in Chrome developer tools. Will the animation on the page be smooth? Why or why not?
<center>
<img src="/api/collection/10370001/6006542571667456/page/4772613497815040/image/4712519489814528" style="max-width:auto;max-height:250px;width: auto;height: auto;">
 </center>

There is one critical rendering path that all browsers use for all websites.

There is one critical rendering path that all browsers use for all websites.

Which of the following is NOT a common critical rendering path?

Which of the following is NOT a common critical rendering path?

If you only change the background color of a page, what critical rendering path will be followed?

If you only change the background color of a page, what critical rendering path will be followed?

Test yourself on what you learned about evaluating website rendering performance!

Introduction

Network

Security

Optimizing Loading Performance

Optimizing Browser Rendering Performance

Search Engine Optimization

System Design

APIs

Testing

Version Control

Task Runners & Bundlers

Conclusion

Evaluating Performance with Developer Tools: Quiz