The ::part
CSS pseudo-element represents any element within a shadow tree that has a matching part
attribute.
custom-element::part(foo) { /* Styles to apply to the `foo` part */ }
Syntax
::part( <ident>+ )
Examples
HTML
<template id="tabbed-custom-element"> <style type="text/css"> *, ::before, ::after { box-sizing: border-box; padding: 1rem; } :host { display: flex; } </style> <div part="tab active">Tab 1</div> <div part="tab">Tab 2</div> <div part="tab">Tab 3</div> </template> <tabbed-custom-element></tabbed-custom-element>
CSS
tabbed-custom-element::part(tab) { color: #0c0c0dcc; border-bottom: transparent solid 2px; } tabbed-custom-element::part(tab):hover { background-color: #0c0c0d19; border-color: #0c0c0d33; } tabbed-custom-element::part(tab):hover:active { background-color: #0c0c0d33; } tabbed-custom-element::part(tab):focus { box-shadow: 0 0 0 1px #0a84ff inset, 0 0 0 1px #0a84ff, 0 0 0 4px rgba(10, 132, 255, 0.3); } tabbed-custom-element::part(active) { color: #0060df; border-color: #0a84ff !important; }
JavaScript
let template = document.querySelector("#tabbed-custom-element"); globalThis.customElements.define(template.id, class extends HTMLElement { constructor() { super(); this.attachShadow({ mode: "open" }); this.shadowRoot.appendChild(template.content); } });
Result
Specifications
Specification | Status | Comment |
---|---|---|
Shadow Parts The definition of '::part' in that specification. |
Working Draft | Initial definition. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
::part | Chrome Full support 73 | Edge Full support 79 | Firefox
Full support
72
| IE No support No | Opera Full support 60 | Safari Full support 13.1 | WebView Android Full support 73 | Chrome Android Full support 73 | Firefox Android No support No | Opera Android Full support 52 | Safari iOS Full support 13.4 | Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- User must explicitly enable this feature.
- User must explicitly enable this feature.
See also
- The
part
attribute - Used to define parts which can be selected by the::part()
selector - The
exportparts
attribute - Used to transitively export shadow parts from a nested shadow tree into a containing light tree. - Explainer: CSS Shadow ::part and ::theme