Add Element.prototype.nextElementSibling polyfill

polyfills/Element/prototype/nextElementSibling/config.toml

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+aliases = [ ]
+dependencies = [
+  "Element",
+  "Object.defineProperty"
+]
+license = "MIT"
+docs = "https://developer.mozilla.org/en-US/docs/Web/API/NonDocumentTypeChildNode/nextElementSibling"
+
+[browsers]
+android = "todo"
+bb = "todo"
+chrome = "todo"
+edge = "todo"
+edge_mob = "todo"
+firefox = "todo"
+ios_chr = "todo"
+ios_saf = "todo"
+ie = "todo"
+ie_mob = "todo"
+opera = "todo"
+op_mini = "todo"
+op_mob = "todo"
+safari = "todo"
+firefox_mob = "todo"
+samsung_mob = "todo"

polyfills/Element/prototype/nextElementSibling/detect.js

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+'document' in self && "nextElementSibling" in document.documentElement

polyfills/Element/prototype/nextElementSibling/polyfill.js

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+Object.defineProperty(Element.prototype, "nextElementSibling", {
+	get: function(){
+		var el = this.nextSibling;
+		while (el && el.nodeType !== 1) { el = el.nextSibling; }
+		return el;
+	}
+});

polyfills/Element/prototype/nextElementSibling/tests.js

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+it("should return null if the node is the only child of its parent node", function () {
+  var parent = document.createElement('div'),
+      p = document.createElement('p');
+  parent.appendChild(p);
+
+  proclaim.strictEqual(p.nextElementSibling, null);
+});
+
+it("should return null if the node only has text sibling", function () {
+  var parent = document.createElement('div'),
+      p = document.createElement('p');
+      text = document.createTextNode('Hi there, how are you doing today?');
+  parent.appendChild(p);
+  parent.appendChild(text);
+
+  proclaim.strictEqual(p.nextElementSibling, null);
+});
+
+it("should return null if the node only has comment sibling", function () {
+  var parent = document.createElement('div'),
+      p = document.createElement('p');
+      comment = document.createComment('This is a comment in the document.');
+  parent.appendChild(p);
+  parent.appendChild(comment);
+
+  proclaim.strictEqual(p.nextElementSibling, null);
+});
+
+it("should return the first child element", function () {
+  var parent = document.createElement('div'),
+      h2 = document.createElement('h2'),
+      p1 = document.createElement('p'),
+      p2 = document.createElement('p'),
+      p3 = document.createElement('p'),
+      text = document.createTextNode('Hi there, how are you doing today?'),
+      comment = document.createComment('This is a comment in the document.');
+  parent.appendChild(h2);
+  parent.appendChild(text);
+  parent.appendChild(comment);
+  parent.appendChild(p1);
+  parent.appendChild(p2);
+  parent.appendChild(p3);
+
+  proclaim.strictEqual(h2.nextElementSibling, p1);
+});