Manipulation: Use textarea for missing IE defaultValue check

IE11 fixed the checkbox defaultValue issue but not textarea. Rather than
creating a new detect name I'm reusing the old one to protect anyone who
is unwisely using this externally. Re-fixing the defaultValue when it
doesn't need to be done is not a problem, so leave that code for IE11.

Fixes #14716
Closes jquerygh-1495

Author: dmethvin

src/manipulation/support.js

@@ -7,8 +7,6 @@ define([
 		div = document.createElement("div"),
 		input = document.createElement("input");
 
-	input.type = "checkbox";
-
 	// Setup
 	div.setAttribute( "className", "t" );
 	div.innerHTML = "  <link/><table></table><a href='/a'>a</a>";
@@ -29,15 +27,18 @@ define([
 	support.html5Clone =
 		document.createElement( "nav" ).cloneNode( true ).outerHTML !== "<:nav></:nav>";
 
-	// Make sure checked status is properly cloned
-	input.checked = true;
-	support.noCloneChecked = input.cloneNode( true ).checked;
-
 	// Check if a disconnected checkbox will retain its checked
 	// value of true after appended to the DOM (IE6/7)
+	input.type = "checkbox";
+	input.checked = true;
 	fragment.appendChild( input );
 	support.appendChecked = input.checked;
 
+	// Make sure textarea (and checkbox) defaultValue is properly cloned
+	// Support: IE6-IE11+
+	div.innerHTML = "<textarea>x</textarea>";
+	support.noCloneChecked = !!div.cloneNode( true ).lastChild.defaultValue;
+
 	// #11217 - WebKit loses check when the name is after the checked attribute
 	fragment.appendChild( div );
 	div.innerHTML = "<input type='radio' checked='checked' name='t'/>";

test/unit/support.js

@@ -178,7 +178,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"inlineBlockNeedsLayout": false,
 			"input": true,
 			"leadingWhitespace": true,
-			"noCloneChecked": true,
+			"noCloneChecked": false,
 			"noCloneEvent": true,
 			"opacity": true,
 			"optDisabled": true,