This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The mode read-only property of the ShadowRoot returns the mode (either "open" or "closed") with which a ShadowRoot was created.
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.
var mode = shadowRoot.mode
Either "open" or "closed".
| Specification | Status | Comment |
|---|---|---|
| DOM The definition of 'ShadowRoot.mode' in that specification. | Living Standard |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 53 | No support[1] | No support[2] | No support | 40 | 10 |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 53 | No support[1] | No support[2] | No support | 40 | 10.1 |
[1] This feature is not implemented yet. See the Edge platform status.
[2] This feature is not implemented yet. See bug 1205323.
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https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot/mode