_Index

What Are Web Components — Complete Guide

Web Components are reusable custom HTML elements built with browser-native APIs — Custom Elements, Shadow DOM, and HTML Templates — without frameworks.

Custom Elements Basics — Complete Guide

Custom Elements let you define new HTML tags with custom behavior using the customElements.define API and HTMLElement class extension.

Custom Element Lifecycle — Complete Guide

Custom Element lifecycle callbacks — constructor, connectedCallback, disconnectedCallback, attributeChangedCallback, adoptedCallback — control component behavior.

Attributes and Observed — Complete Guide

Custom element attributes are reflected as properties, with observedAttributes enabling reactive updates and attributeChangedCallback responding to changes.

Custom Elements Built-In — Complete Guide

Customized built-in elements extend native HTML elements like button, input, and select, inheriting all their built-in behavior and accessibility features.

Shadow DOM Basics for Web Components — Complete Guide

Shadow DOM provides style and DOM encapsulation for Web Components, preventing CSS conflicts and isolating component internals from the host page.

Shadow DOM Styling — Complete Guide

Shadow DOM styling techniques include :host, :host-context, ::slotted, CSS custom properties, and CSS parts for flexible component customization.

HTML Templates for Web Components — Complete Guide

HTML Templates provide reusable markup fragments that Web Components clone for efficient rendering, with slots for content projection.

Template Instantiating — Complete Guide

Template instantiating involves cloning template content, populating it with data, and appending to shadow DOM for efficient Web Component rendering.

Composing Components — Complete Guide

Composing Web Components involves nesting custom elements, passing data via attributes and slots, and coordinating communication between parent and child components.

CSS Custom Properties in Web Components — Complete Guide

CSS custom properties (variables) cross the Shadow DOM boundary, enabling host pages to theme encapsulated components without breaking style isolation.

CSS Parts — Complete Guide

CSS parts (::part()) expose specific shadow DOM elements for external styling, giving users controlled access to internal component elements.

Web Components Custom Elements -- Complete Beginner's Guide

Learn how to build Custom Elements using the Web Components API to create reusable, framework-agnostic HTML tags with encapsulated behavior and lifecycle hooks.

Events in Web Components — Complete Guide

Events in Web Components use CustomEvent for communication, with retargeting across shadow boundaries and composed events for cross-boundary propagation.

Accessible Web Components — Complete Guide

Accessible Web Components require proper ARIA attributes, keyboard handling, focus management, and semantic structure for assistive technology compatibility.

Component Communication — Complete Guide

Component communication in Web Components uses attributes, properties, custom events, and shared state for parent-child and sibling component interaction.

Adopted Stylesheets — Complete Guide

Adopted stylesheets (adoptedStyleSheets) allow sharing CSSStyleSheet objects across shadow roots for efficient, reusable styles without duplication.

Polyfills and Browser Support — Complete Guide

Web Components polyfills provide backward compatibility for older browsers, with the webcomponentsjs bundle supporting Custom Elements and Shadow DOM.

Testing Web Components — Complete Guide

Testing Web Components involves unit tests with Jest, DOM tests with testing-library, and visual regression tests for shadow DOM rendered output.

Lit Element — Complete Guide

Lit is a lightweight library for building Web Components with reactive properties, declarative templates, and efficient re-rendering using lit-html.

Web Component Libraries — Complete Guide

Web Component libraries like Lit, Stencil, FAST, and Catalyst simplify building components with added features like reactivity, tooling, and SSR support.

Web Components Project — Complete Guide

Build a complete design system using Web Components including buttons, inputs, modals, tooltips, and cards with consistent theming and documentation.