Video: Authoring HTML in a JavaScript World

Web Components are a piece of reusable UI enabled by web standards and built into the web platform. They offer the potential for faster component initialization and less library overhead. Web Components can be created from scratch and utilized with existing component libraries. Shadow DOM and Declarative Shadow DOM provide benefits such as scoped CSS and server-rendered components. The tradeoff between not repeating oneself and achieving full server-side rendering support is discussed. User experience is deemed more important than developer experience.

Today's Talk introduces Mitosis, an open source project that solves the problem of building framework agnostic components. It supports JSX and Svelte syntax and outputs human-readable code for various web frameworks. Mitosis is already being used by enterprise customers and can be easily integrated with React, Svelte, and other frameworks. It saves time, allows for easy handling of framework version migrations, and enables efficient unit and integration testing.

Web Components and the Lit library are introduced, highlighting their ability to create custom elements and replicate built-in components with different functionality. The use of semantic HTML and the benefits of web components in development are emphasized. The features of Lit, such as data binding and rendering, are discussed. The Santa Tracker is showcased as an example of web components being used in educational games. The compatibility of web components with other frameworks and their versatility in creating small widgets or large applications are highlighted.

Today's Talk discusses immutable web apps and their benefits, such as faster loading times and easy version tracking. The use of Universal Module Definition (UMD) style bundling allows for flexible dependency management and gradual upgrades. Tools like Webpack and Rollup provide ways to reference UMDs in bundles and automate dependency configuration. Arborist and YAML files help resolve dependency trees and handle conflicts, while the Orchard CLI tool automates dependency ordering. Internal and external dependencies can be initialized and managed effectively for optimal performance.

The Shadow DOM allows for encapsulation and composability, enabling elements to have their own features without affecting the rest of the webpage. Custom elements in the Shadow DOM have their own behavior through encapsulation and scoped styles. Composability is key in software development, allowing for dynamic data passing. The Shadow DOM provides a way to modify the appearance of elements within it, but some properties are marked as important and cannot be changed. Building a Chrome extension using the Shadow DOM allows for composable and encapsulated experiences.

Web components allow you to create your own HTML elements that can do anything you want, and they are supported by all modern browsers. Many companies, including YouTube and GitHub, use web components to enhance their websites. There are extensive tooling and libraries available for web component development. The Model Viewer Web Component enables the display of 3D models in Virtual and Augmented Reality without needing to know underlying technologies. Web components can be used with various frameworks and libraries, and there are resources available to help with compatibility.