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The mode property of the ShadowRoot specifies its mode — either open or closed. This defines whether or not the shadow root's internal features are accessible from JavaScript.

When the mode of a shadow root is "closed", the shadow root’s implementation internals are inaccessible and unchangeable from JavaScript—in the same way the implementation internals of, for example, the <video> element are inaccessible and unchangeable from JavaScript.

Syntax

var mode = shadowRoot.mode

Value

A value defined in the ShadowRootMode enum — either open or closed.

Examples

let customElem = document.querySelector('my-shadow-dom-element');
let shadow = customElem.shadowRoot;

// Another way to check whether the shadow root is open; it will return null if not
if(shadow) {
  // If it is open, close it to stop people stealing our secrets!
  shadow.mode = 'closed';
}

Specifications

Specification Status Comment
DOM
The definition of 'ShadowRoot.mode' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
mode
Experimental
Chrome Full support 57Edge No support No
Notes
No support No
Notes
Notes In Development
Firefox Full support 63
Full support 63
No support 59 — 63
Disabled
Disabled From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 40Safari Full support 10.1WebView Android Full support 57Chrome Android Full support 57Edge Mobile No support No
Notes
No support No
Notes
Notes In Development
Firefox Android Full support 63
Full support 63
No support 59 — 63
Disabled
Disabled From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 41Safari iOS Full support 10.1Samsung Internet Android Full support 6.0

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

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