LibWeb: Connect existing implementation of Node::is_connected to JS.

I was looking at implementing something else, and saw this was low
hanging fruit, that brings the browser closer to standards conformance.

Add a basic test as well to validate it's implementation.

2 files changed, 12 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/DOM/Node.idl b/Userland/Libraries/LibWeb/DOM/Node.idl
index 5667340c8c..cf98316266 100644
--- a/Userland/Libraries/LibWeb/DOM/Node.idl
+++ b/Userland/Libraries/LibWeb/DOM/Node.idl
@@ -12,6 +12,7 @@ interface Node : EventTarget {
     readonly attribute Node? nextSibling;
     readonly attribute Node? parentNode;
     readonly attribute Element? parentElement;
+    readonly attribute boolean isConnected;
     attribute DOMString textContent;
 
     Node appendChild(Node node);
diff --git a/Userland/Libraries/LibWeb/Tests/DOM/Node.js b/Userland/Libraries/LibWeb/Tests/DOM/Node.js
index 5427d143bd..47c3e1c668 100644
--- a/Userland/Libraries/LibWeb/Tests/DOM/Node.js
+++ b/Userland/Libraries/LibWeb/Tests/DOM/Node.js
@@ -25,4 +25,15 @@ afterInitialPageLoad(() => {
             HIDDEN TEXT
         `);
     });
+
+    test("Node.isConnected", () => {
+        var element = document.createElement("p");
+        expect(element.isConnected).toBeFalse();
+
+        document.body.appendChild(element);
+        expect(element.isConnected).toBeTrue();
+
+        document.body.removeChild(element);
+        expect(element.isConnected).toBeFalse();
+    });
 });