reliabilty of 'isConnected' field in dom node

It is not supported, but very easy to polyfill.

(function (supported){
  if (supported) return;
  Object.defineProperty(window.Node.prototype, 'isConnected', {get})
  function get() {
    return document.contains(this);
  }
})('isConnected' in window.Node.prototype);


A quick test shows Firefox doesn't support this property. So the answer is no. 

var input = document.getElementById('input');
alert(input.isConnected);
<input type="text" id="input">

https://jsfiddle.net/hu08awn0/

Tags:

Javascript

Dom

Jquery

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