The Custom Element API allows you to define new HTML tags with associated templates, styling and logic. Another great example of this are Salesforce’s Lightning Web Components, a lightweight framework that abstracts away the complexity of the different web standards. Stencil is a compiler that generates Web Components (more specifically, Custom Elements). These are just a few of the key benefits that explain the growing popularity of Web Components. No trickery or wizardry about it — it’s just JavaScript, HTML and CSS. We can query elements via this.shadow.querySelector('img') or use appendChild and other similar methods you’d expect on the document. Default duration for Scratch org is 7 days. If you are interested in getting more in-depth on the four features that Web Components leverage from browsers, I would recommend that you read the latest from . In this course you will create a web component from scratch using Polymer, and bind it … The end result was an HTML element they could put anywhere that would get the most up-to-date results and chart it for them: It all sounds nice on paper. It is very similar to working with a normal document. HTMLElement is part of the default JavaScript spec and it has four lifecycle callbacks that we can take advantage of (other than the default constructor). Select Three Regions and click Finish. For our candidate-image example, let’s make it so we can mark a candidate as a “winner” by specifying a status. We simply make a request to their API to get the most up to date data and then populate some HTML we built within the components. Then we could look at the value of the type attribute in our component and pull up the correct image. By default, our component doesn’t observe any changes — after all, a component may have a ton of logic and it couldn’t reasonably know what to do without us telling it. With Custom Elements, web developers can create new HTML tags, beef-up existing HTML tags, or extend the components other developers have authored. Funny enough, the only browser that supported @font-face in the scoped components was mobile safari… go figure ‍♀️. Web Components can be made using plain CSS, HTML and JS without a build process. Think of it like a React or Angular component (e.g. So, where do we start? So when PBS NewsHour came to us at Upstatement to build some graphics and charts that they could use on their website and broadcast, we knew the future of the nation rested solely on our shoulders. We have a custom component. The Web Components specifications are a set of low-level APIs that will continue to grow and evolve as our needs as developers evolve. Using this element you can place a video with just a few of lines of code, for example: You may only be seeing a few lines of HTML above, but here's what the