Libraries!

Goals:

Use the jQuery getScript method to download and execute the script located at the address referenced by the variable src.
Like most I/O functions, $.getScript functions asynchronously—hence the use of await/defer.

Each library has its own rules and syntax for use, formally referred to as the application programming interface, or API.
You can find a library's API on the public repository where the source code is located and/or on a site dedicated to the library. For example, the Chart.xkcd library is documented at the npm code repository, npmjs.com, and at the author's website, timqian.com.
One option for using libraries is to download them to the server hosting the website and to install them using special software known as a package manager. However, this is not an option for us, since we do not control the Pencil Code server! But not to worry: most libraries can be loaded directly into our programs from a third-party content delivery network, or CDN. For example, as with most packages on the npm respository, Chart.xkcd can be obtained from jsdelivr.com.

Save each of the following in a folder called Libraries.

Celebration: use the canvas-confetti library to add joyous fanfare to the end of a TurtleRace or some other script.
GraphingMadeEasy: create a graph of some data of your choice using the powerful (and complicated) ChartJS library or the more whimsical (and more straightforward) Chart.xkcd. Follow the links to find the API!

Rough.js is a small graphics library that lets you draw in a sketchy, hand-drawn-like style. Get creative, and come up with a cool HandDrawnDesign of your choice! Note: like most libraries, Rough.js uses HTML coordinates (i.e., with 0,0 in the top left corner).
Chroma.js provides powerful tools for manipulating and mixing colors. Explore it and see if you can come up with a cool application of your own. (If you do draw a blank, you can always use it to come up with a better Rainbow.)