Now that we've seen a hands-on example of how JavaScript can be used with Python, let's discuss its uses across the frontend spectrum. Spoiler alert: we'll be using JavaScript on the server side, starting in the next chapter. We encountered some cryptic commands in our Ajax example, so while it may be easy to overlook the use of and need for JavaScript, we see it's a real language with real applications.
Part of the beauty of JavaScript is its nearly universal adoption in browsers. Over time, JavaScript syntax and features have slowly evolved, but support for the different features, which were at one time wildly different between browsers, is now standardizing. Some differences still remain, however, but there are useful tools on the web that are kept up to date on the various features that browsers may or may not support. One of these sites is caniuse.com, and this is illustrated in the following screenshot:
