The focus of front end interviews differs from typical software engineer job interviews in that they put more emphasis on excellent knowledge of HTML, CSS, and JavaScript, just to name a few.
In comparision to a software engineer interview resources, there are very fewer really good resources for front end developers interviews. There are several resources available, but Today i will tell you about a perfect place for best Front-end Developer Interview Questions would be the most helpful. These questions aren't answered easily online due to a lack of complete and satisfying answers. But, here you will not only find questions but also its really good, easy to understand answers.
The Platform's Name is Frontend interview Handbook :-
Website Link: frontendinterviewhandbook.com
This Handbook contains really good sections that cover almost every concepts related to Frontend Engineering interview like, Short questions which test your core concepts knowledge and have clear non-subjective answers and are almost 100% chances of being asked. E.g. Explain the "this" keyword in JavaScript
Easy LeetCode-style algorithmic coding questions, but solve them using JavaScript. Implement a common function in JavaScript. This is the front end version of LeetCode-style algorithm questions. E.g. Implement the debounce function found in Underscore/Lodash
Build User Interfaces (component/app/game) - Write HTML, CSS and JavaScript to implement a UI component or a small app/game. E.g. Build a tabs component, Tic-tac-toe Game, Tetris Game
System Design - Describe and discuss how you would build a UI component/app/game and its architecture. This is the front end version of system design questions. E.g. Describe how you would build Emoji autocomplete feature in a chat app, what APIs it would have, what components there are to the feature, how to ensure it has good performance, UX, etc.
In short, this will help you prepare almost 100% for your Frontend interview. All the Best!