To get the most out of this book

To get the most out of this book, you need to comply with the following:

• You will need a basic understanding of web development technologies such as HTML, CSS, and JavaScript.
• You should be able to open websites on a browser and debug them using developer tools. 
• You should be familiar with GitHub, since it has all the code files you'll need.
• You should be able to use Node.js (https://nodejs.org/en/) via Terminal or Command Prompt.
• You should be able to use a text editor. 

Download the example code files

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packt.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packt.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Getting-Started-with-Web-Components. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://static.packt-cdn.com/downloads/9781838649234_ColorImages.pdf.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, path names, dummy URLs, user input, and Twitter handles. Here is an example: "A user looking for a music player with the ability to show liked or disliked songs will end up using the <music-player> component rather than something else." 

A block of code is set as follows:

class myClass {
 constructor() {
 // do stuff
 }
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

class HelloWorld extends HTMLElement {
  constructor() {
    super();

    // do magic here
    this.innerText = 'Hello World';
  }
}

Any command-line input or output is written as follows:

$ py -m http.server

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Enter your NPM package name and click on the Publish button."

Warnings or important notes appear like this.

Tips and tricks appear like this.