Learn to apply your introductory knowledge of HTML, CSS, and JavaScript to build beautiful, real-world components. In this course, you'll go through the process of developing several complex components, including:

- eBay's dropdown menu
- Gmail's auto-validating form
- Google's main autocomplete enabled search
- Twitter's infinitely scrolling list
- Medium's tooltips

You'll learn how to approach common frontend challenges, what questions to ask yourself, how to design solutions once you've thought of them, how to debug and work with mistakes, and more.

The end-goal is to empower you to look at anything you see on a website and be able to say, "I can build that!"

Intermediate JavaScript: Building Frontend Components

## The range property
Our previous attempt of wrapping the text we want in a span and getting the position of the span didn't work. Time to Google for another lead. Searching for "get position of text", I find a `range` property which I saw in the `getSelection` API but hadn't paid attention to.

# The range property
Our previous attempt of wrapping the text we want in a span and getting the position of the span didn't work. Time to Google for another lead. Searching for "get position of text", I find a `range` property which I saw in the `getSelection` API but hadn't paid attention to.

The previous approach didn't work, so we'll try to use a different approach to find the middle of the cursor. 

Alternative Approach to find the Middle

The previous approach didn't work, so we'll try to use a different approach to find the middle of the cursor.

Welcome

Building a Dropdown Menu

Building the Autocomplete Search

Building Tooltips

Building an Autovalidating Form

Building an Infinite List

From Toy Components to Production

Alternative Approach to find the Middle

The range property