Finally, we register our custom element on the CustomElementRegistry using the define() method we mentioned earlier — in the parameters we specify the element name, and then the class name that defines its functionality: It is now available to use on our page. binding their properties to a model. First of all, we define our element's class, in the same manner as before: We will not explain the element functionality in any detail here, but you can discover how it works by checking out the source code. For that type of functionality, you will need to provide a ViewModel for your custom element. Please note that ES2015 classes cannot reliably be transpiled in Babel 6 or TypeScript targeting legacy browsers. The CSS @font-face Rule. At this point, let's go through some more simple examples to show you how custom elements are created in more detail. With a custom element, you can extend the set of available HTML tags. custom-elements-es5-adapter.js gives us Custom Element support inside our browser. Some browsers are still in the process of updating to support the standards for Web Components. ', 'Custom square element moved to new page. no children. Note: Find the full JavaScript source here. Many of the scenarios implemented by using custom XML markup can be implemented by using alternative technologies, such as content controls, form fields, and bookmarks which are available in Word 2007, Word 2010 and Word 2013. This takes an image icon and a text string, and embeds the icon into the page. It should always be written like this: . In the above example we apply style to the Shadow DOM using a