HostBaseline · Widely available

The :host CSS pseudo-class selects the containing element of the shadow tree in which it is used. The :host() CSS pseudo-class selects the that element only if it matches the provided selector.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Jan 15, 2020. Widely available since Jul 15, 2022.

How to use ↓Compare browsers

Browser support

DesktopChrome

1–53Not supported

54+Supportedsince Oct 12, 2016

Current: 155

Edge

12–18Not supported

79+Supportedsince Jan 15, 2020

Current: 154

Firefox

1–62Not supported

63+Supportedsince Oct 23, 2018

Current: 157

Safari

1–9.1Not supported

10+Supportedsince Sep 20, 2016

Current: 27

MobileChrome Android

18–53Not supported

54+Supportedsince Oct 19, 2016

Current: 155

Firefox Android

4–62Not supported

63+Supportedsince Oct 23, 2018

Current: 157

Safari iOS

1–9.3Not supported

10+Supportedsince Sep 13, 2016

Current: 27

How to use

This feature is Baseline widely available — use it freely, no fallback needed.

Example

Full syntax and examples are on MDN: :host.

Feature detection

CSS · check before using

@supports selector(:host(*)) {
  /* styles that use :host(*) */
}

/* or in JavaScript */
if (CSS.supports("selector(:host(*))")) {
  // use it
}

Documentation (MDN)

Specification

drafts.csswg.org#host-selector ↗

Sub-features

Support for each part of the feature (2). The overall table above shows when the whole feature works.

Sub-feature	Chrome	Edge	Firefox	Safari	Chrome Android	Firefox Android	Safari iOS
host	54	79	63	10	54	63	10
hostfunction	54	79	63	10	54	63	10