This content originally appeared on Manuel Matuzović - Web development blog and was authored by Manuel Matuzović
We already know that we can encapsulate styles within a web component by adding elements along with the styles to the shadow DOM. Global style declarations from outside don’t overwrite styles inside the web component.
Shadow DOM doesn't provide total encapsulation, though.
If you look at the following component, you’ll notice that it uses the same font as the rest of the page, even though I haven't applied any styles to the web component. If styles were completely encapsulated, I would expect the component to use a default font like Times, but the web component inherits styles from its parent elements.
Demo:
HTML:
<shadow-component></shadow-component>JS:
class ShadowComponent extends HTMLElement {
constructor() {
super();
this.attachShadow({mode: 'open'});
this.shadowRoot.innerHTML = `<div>Hello World!</div>`
}
}
customElements.define('shadow-component', ShadowComponent);If I wrap the component in a <div> and a set a color on the div, the color of the text inside the web component changes as well. That's because top-level elements of a shadow tree inherit from their host element. In other words, inhertiable styles will be passed to the shadow DOM.
.parent {
color: red;
}<div class="parent">
<shadow-component></shadow-component>
</div>Demo:
This content originally appeared on Manuel Matuzović - Web development blog and was authored by Manuel Matuzović
Manuel Matuzović | Sciencx (2022-10-19T09:38:54+00:00) Day 18: inhertiable styles and web components. Retrieved from https://www.scien.cx/2022/10/19/day-18-inhertiable-styles-and-web-components/
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