The Case for Web Components

With the release of “Edgium”, all major browsers now support Web Components. An effort 9 years in the making, but we’ve finally made it. WebComponents are supported natively in every major browser pic.twitter.com/6yPoTXno27 — Polymer Project (@polymer) January 15, 2020 Perfect time to link to this by Viljami Salminen in which he makes the case […]

When in doubt, trust the browser

Presentation by Pieter Beulque, as given at the most recent FronteersBE meetup, in which he builds a Tweet Embed using Web Components’ Custom Elements. As a front-end developer, you’re always confronted with making choices. In this talk I cover the benefits you get for free when considering W3C standards or standard browser API’s instead of […]

More performant YouTube embeds with <lite-youtube-embed>

By Paul Irish: Provide videos with a supercharged focus on visual performance. This custom element renders just like the real thing but approximately 224X faster. Installation per NPM: npm install lite-youtube-embed Usage: <!– Include the stylesheet, this could be direct from the package or bundled –> <link rel="stylesheet" href="node_modules/lite-youtube-embed/src/lite-yt-embed.css" /> <!– Include the custom element […]

Unicode Patterns with <css-doodle />

<css-doodle /> is a web component for drawing patterns with CSS. The component will generate a grid of divs by the rules (plain CSS) inside it. You can easily manipulate those cells using CSS to come up with a graphic pattern or an animated graph. The limit is the limit of CSS itself. Combine <css-doodle […]

Stencil: A Compiler for Web Components

Stencil is a compiler that generates Web Components (more specifically, Custom Elements). Stencil combines the best concepts of the most popular frameworks into a simple build-time tool. Stencil takes features such as Virtual DOM Async rendering (inspired by React Fiber) Reactive data-binding TypeScript JSX and then generates standards-based Web Components with these features baked in. […]

Rendering Markdown using Custom Elements v1

Inspired upon a v0 implementation, I’ve recreated a Markdown renderer in Custom Elements v1. The result is <custom-markdown>. The code itself is pretty straightforward: other than some (contained) styling the custom element uses showdown to convert the Markdown to HTML. This conversion is triggered in the connectedCallback(). class Markdown extends HTMLElement { constructor() { super(); […]

Web Components: Introducing Custom Elements

One of the new features in Safari Technology Preview 18 is Custom Elements v1 (Chrome/Opera already support for it): To define a custom element, simply invoke customElements.define with a new local name of the element and a subclass of HTMLElement. Example Code: class CustomProgressBar extends HTMLElement { constructor() { super(); const shadowRoot = this.attachShadow({mode: 'closed'}); […]

ReactiveElements: Convert React.js components into Web Components

Create your component as you normally would, and then register it on the document using document.registerReact(…) /* @jsx React.DOM */ MyComponent = React.createClass({ render: function() { console.log(this.props.items); // passed as HTML tag`s argument console.log(this.props.children); // original tag children return <ul><li>React content</li></ul>; } }); document.registerReact('my-react-component', MyComponent); You can then use it as follows: <body> <my-react-component items="{window.someArray}"></my-react-component> […]

voice elements

Web Component wrapper to the Web Speech API, that allows you to do voice recognition (speech to text) and speech synthesis (text to speech) using Polymer. Really nifty! Thanks to Polymer you’ll be provided with two extra elements you can use: <voice-player> for text to speech and <voice-recognition> for speech to text <– text to […]

Custom HTML Elements

<template id=”sdtemplate”> <style> p { color: orange; } </style> <p>I’m in Shadow DOM. My markup was stamped from a &lt;template&gt;.</p> </template> <script> var proto = Object.create(HTMLElement.prototype, { createdCallback: { value: function() { var t = document.querySelector(‘#sdtemplate’); this.createShadowRoot().appendChild(t.content.cloneNode(true)); } } }); document.register(‘x-foo-from-template’, {prototype: proto}); </script> Custom Elements allow web developers to define new types of HTML […]