What web components are
Web components are a set of web standards that let developers create their own custom, reusable HTML elements. Just as the web comes with built-in elements like buttons and images, web components let you build your own, such as a custom rating widget or a date picker, that behave like native elements. These custom elements are self-contained and can be reused across different pages and projects, bringing a building-block approach to the web.
The idea of reusability
Modern websites are often built from reusable pieces, components that can be used again and again, such as a card, a menu, or a dialog box. Many frameworks offer their own way of creating these, but those components usually only work within that specific framework. Web components aim to provide this reusability as a built-in feature of the web itself, so a component can work anywhere, independent of any particular framework.
What makes them up
Web components are built on a few underlying web standards working together. One lets developers define entirely new custom HTML elements with their own names and behavior. Another, often called the shadow DOM, lets a component keep its internal structure and styling separate and protected, so it does not clash with the rest of the page. Together these allow truly self-contained, encapsulated elements.
Encapsulation
A key strength of web components is encapsulation, meaning a component's internal workings are sealed off from the rest of the page. Its styles will not accidentally leak out and affect other elements, and outside styles will not unexpectedly break it. This isolation makes components reliable and predictable, since each one is a tidy, independent package that behaves the same wherever it is dropped in, without interfering with its surroundings.
Why they matter
Because web components are a native web standard rather than a framework feature, a component built with them can be shared and reused across different projects and frameworks, or even on plain pages with no framework at all. This portability is valuable for building shared libraries of elements that many teams can use. While frameworks remain popular, web components offer a framework-independent foundation for reusable building blocks.
The bottom line
Web components are a web standard that lets developers create their own reusable, self-contained custom HTML elements that work across frameworks or none at all. Built from standards for defining custom elements and isolating their internals, they bring portable, encapsulated building blocks to the web itself. Understanding them explains a native approach to the reusable components that modern websites are made from.
Related on Skillo
See also: What is HTML? Explained, What is a web framework? Explained.
Sources
Published date reflects the original event date (2026-10-23). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
Leave a Reply