![]() ![]() ![]() To actually render the welcome message, you'll need to use a bit of JavaScript: const template = document.getElementById('welcome-msg') ĭ(ntent) Įven though this is a pretty simple example, you can already see how using templates makes it easy to reuse code throughout a page. But if you open the dev console, you'll see both elements have been parsed: If you look at the page, neither the or elements are rendered. ![]() Let's look at a simple welcome message example: The first piece of the puzzle is learning how to use HTML templates to create reusable HTML markdown. We'll dive into each of these a bit more throughout the tutorial. Any styles and scripts you create for your custom components in the Shadow DOM will not affect other elements in the main DOM. Shadow DOM: A smaller, encapsulated DOM that is isolated from the main DOM and rendered separately.Once you create and register a custom element using these APIs, you can use it similarly to a React component. Custom elements: Widely supported JavaScript APIs that let you create new DOM elements.HTML templates: Fragments of HTML markup using elements that won't be rendered until they're appended to the page with JavaScript.Web Components are actually a collection of a few different technologies that allow you to create custom HTML elements. But with the introduction of Web Components, it's possible to create reusable components without using things like React. Until recently it wasn't possible to use components in vanilla HTML and JavaScript. This is one of the major problems things like React or Handlebars.js solve: any code, especially structural things like a header or footer, can be written once and easily reused throughout a project. Suddenly any change, no matter how small, has to be repeated across all those files. The header and footer are already looking good, and all you need to do is change the rest of the content.īut what if your client wants 10 pages? Or 20? And they request minor changes to the header and footer throughout development. So when you finish working on the landing page and start on the contact page, you just create a new HTML file and copy over all the code from the first page. Imagine you're building a site for a client, a small mom-and-pop store, that only has two pages. ![]()
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