html Using Slots in Custom Elements The slot element allows for more flexibility in your custom elements, and is very simple to use.
css Shadow DOM: Encapsulation for Custom Elements The Shadow DOM helps to keep custom elements' CSS contained, so they can be truly standalone components.
javascript Custom Elements (Web Components) Custom Elements (also known as Web Components) are a great way of writing reusable and testable code. They allow you to define a new HTML tag, which has Javascript associated with it.
css CSS Variables One real limitation of CSS when building any kind of site is that it is hard to easily change common values, such as colours -- CSS variables change that.
javascript Fetch: A modern replacement for XHR Fetch is a replacement for XMLHttpRequest. It offers a simple way of making requests to a server, returning the result in a promise.
javascript Javascript Arrow functions One of the biggest new features in the ES2015 specification was the introduction of arrow functions. They help to make function definitions much shorter, as well as making working with "this" a lot easier.
javascript How and why to use Symbols in Javascript Symbols are a primitive data type in Javascript introduced in the ES2015 specification. The main use case is private properties, and the second is to help avoid accidental overrides in classes and objects.
javascript Strings in ES2015+ Today we will take a look at some new string-related features, which you can start using in modern browsers right now. These are template literals, .includes(), padding and repeat.
