The read-only isConnected property of the Node interface returns a boolean indicating whether the node is connected (directly or indirectly) to the context object, for example the Document object in the case of the normal DOM, or the ShadowRoot in the case of a shadow DOM.


A boolean value that is true if the node is connected to its relevant context object, and false if not.


Standard DOM

A standard DOM example:

let test = document.createElement('p');
console.log(test.isConnected); // Returns false
console.log(test.isConnected); // Returns true

Shadow DOM

A shadow DOM example:

// Create a shadow root
const shadow = this.attachShadow({mode: 'open'});

// Create some CSS to apply to the shadow DOM
const style = document.createElement('style');
console.log(style.isConnected); // returns false

style.textContent = `
.wrapper {
  position: relative;

.info {
  font-size: 0.8rem;
  width: 200px;
  display: inline-block;
  border: 1px solid black;
  padding: 10px;
  background: white;
  border-radius: 10px;
  opacity: 0;
  transition: 0.6s all;
  positions: absolute;
  bottom: 20px;
  left: 10px;
  z-index: 3

// Attach the created style element to the shadow DOM

console.log(style.isConnected); // Returns true


DOM Standard
# ref-for-dom-node-isconnected①

Browser compatibility

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See also