Web Components Custom

⬢ ティア 2テクニカル

普通

給与インパクト

3か月

習得までの期間

普通

難易度

—

職種数

概要

Web Components is a native browser standard for creating custom, reusable HTML elements with encapsulated styles and behavior. Components use Shadow DOM, Custom Elements API, and HTML Templates. Used by teams building design systems, component libraries, and framework-agnostic UI tooling. Salary band: $105–155k mid-level. Takes 3–4 weeks to proficiency if you know JavaScript and CSS; 2+ months from basics.

Web Components Customとは

Web Components is a suite of standards (Custom Elements, Shadow DOM, HTML Templates, Slots) for creating encapsulated, reusable UI elements. Unlike frameworks, Web Components are native browser APIs, any modern browser understands them without build tools or transpilation. Custom elements extend HTML with new tags (e.g., ), Shadow DOM isolates styles and DOM, and slots allow content projection. Web Components power design systems, component libraries, and framework-agnostic UI tooling. They enable code reuse across React, Vue, Angular, and vanilla JavaScript.

🔧 ツール＆エコシステム

Shadow DOM APICustom Elements APIHTML TemplatesLit (Lightweight Web Components)StencilWeb Component AnalyzersCypress / Testing LibraryStorybook

💰 地域別給与

地域	ジュニア	ミドル	シニア
USA	$85k	$130k	$185k
UK	$50k	$85k	$120k
EU	$55k	$90k	$130k
CANADA	$80k	$120k	$170k

🎓 認定資格

Web Components Fundamentals Custom Elements Specification

⚖ 比較

React Advanced Design Systems Architecture

❓ よくある質問

Are Web Components better than React/Vue?

Different tools for different goals. Web Components are framework-agnostic and native; React/Vue are more productive for app development. Use Web Components for libraries and design systems; frameworks for apps.

Do Web Components work in all browsers?

All modern browsers support Web Components natively (Chrome, Firefox, Safari, Edge). IE11 needs polyfills. For 2026+, native support is essentially universal.

What's Shadow DOM and why does it matter?

Shadow DOM encapsulates component styles and DOM, preventing style leakage and conflicts. Critical for design system reliability. CSS inside Shadow DOM doesn't affect outside; vice versa.

Can I use Web Components with React?

Yes, but with friction. Web Components as custom elements work in React, but event passing and state management require workarounds. Use Lit for better interop.

How do I handle slots and content projection?

Named slots allow parent components to project content into specific areas. Slots are the Web Components way of composition; similar to React.children.

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