The ultimate guide to CSS interviews, developed by FAANG engineers. Prep faster and get interview-ready in hours with battle-tested, real-world questions and a structured approach to styling and advanced concepts.

In front-end interviews there’s a lot to cover. You have to study up on JavaScript, HTML, and then there’s CSS, and that’s the focus of this course.

This course compiles a comprehensive range of questions that you are most likely to be tested on during front-end interviews. This is an intermediate course with more than 250 coding challenges and multiple choice questions, so there’s plenty of opportunities to get your hands dirty.

You will start by going through several self-assessment exams to get an idea of what you’ll need to study up on. From there, you’ll go into interview questions on styling such as text, colors, backgrounds, and display.

In the latter half of the course, you’ll focus on advanced concepts like Flexbox, block formatting, and working with SVG. In all, this course serves as a stand-alone guide for those who are starting to prepare for front-end interviews.

By the end of this course, you will have gained the confidence to go in and answer any question.

CSS for Front-end Interviews

# What is a block formatting context?

A **Block Formatting Context (BFC)** is part of the visual CSS rendering of a web page in which block boxes are laid out. _Floats_, _absolutely_ positioned elements, _inline-blocks_, _table-cells_, _table-captions_, and elements with _overflow_ other than `visible` establish new block formatting contexts.

A BFC is an HTML box that satisfies at least one of the following conditions:

- The value of `float` is not `none`
- The value of `position` is neither `static` nor `relative`
- The value of `display` is `table-cell`, `table-caption`, or `inline-block`
- The value of `overflow` is not `visible`
- In a BFC, each box's left outer edge touches the left edge of the containing block (for right-to-left formatting, right edges touch)

# Creating a block formatting context using the `display` property

Suppose we have an element floated on the left side of a `div`. The left floated element is in a `steelblue` color and the `div` is in the `coral` background color. The text is wrapping around the box. Currently, there is no block formatting context.

```css
#box {
  float: left;
  width: 50px;
  height: 50px;
  background: steelblue;
}
```

```css
div {
  border: 3px solid black;
  background: coral;
  width: 50%
}
```



Evaluate yourself with a quiz on the block formatting context of CSS and the creation of block formatting context in this lesson.

Introduction

Basic Styling

Intermediate Styling

Advance Styling

Advance Concepts

Responsive Design

Wrapping Up

Block Formatting Context (BFC)

What is a block formatting context?