Fixed jquery#1264. If you read the bug there were many proposed changes. As it turned out most of them had already been implemented. The last ones necessary were in .domManip() with when a <table> was 'this' and for .text(). Adding these last changes seems to make dom and text manipulation in IE frames possible. Unit test cases were added as well.

davids549 · davids549 · commit 74a132d94488 · 2007-12-05T00:26:13.000Z
In addition "submit.gif" was removed from the test suite index.html since it didn't exist.
diff --git a/src/core.js b/src/core.js
@@ -202,7 +202,7 @@ jQuery.fn = jQuery.prototype = {
 
 	text: function( text ) {
 		if ( typeof text != "object" && text != null )
-			return this.empty().append( document.createTextNode( text ) );
+			return this.empty().append( (this[0] && this[0].ownerDocument || document).createTextNode( text ) );
 
 		var ret = "";
 
@@ -468,7 +468,7 @@ jQuery.fn = jQuery.prototype = {
 			var obj = this;
 
 			if ( table && jQuery.nodeName( this, "table" ) && jQuery.nodeName( elems[0], "tr" ) )
-				obj = this.getElementsByTagName("tbody")[0] || this.appendChild( document.createElement("tbody") );
+				obj = this.getElementsByTagName("tbody")[0] || this.appendChild( this.ownerDocument.createElement("tbody") );
 
 			var scripts = jQuery( [] );
 
diff --git a/test/data/iframe.html b/test/data/iframe.html
@@ -0,0 +1,8 @@
+<html>
+  <head>
+    <title>iframe</title>
+  </head>
+  <body>
+    <div><span>span text</span></div>
+  </body>
+</html>
diff --git a/test/index.html b/test/index.html
@@ -21,6 +21,8 @@ <h2 id="userAgent"></h2>
 	
 	<!-- Test HTML -->
 	<div id="nothiddendiv" style="height:1px;background:white;"></div>
+	<!-- this iframe is outside the #main so it won't reload constantly wasting time, but it means the tests must be "safe" and clean up after themselves -->
+	<iframe id="loadediframe" name="loadediframe" style="display:none;" src="data/iframe.html"></iframe>
 	<dl id="dl" style="display:none;">
 	<div id="main" style="display: none;">
 		<p id="firstp">See <a id="simon1" href="http://simon.incutio.com/archive/2003/03/25/#getElementsBySelector" rel="bookmark">this blog entry</a> for more information.</p>
@@ -151,7 +153,7 @@ <h2 id="userAgent"></h2>
 			</select>
 			<input type="submit" name="sub1" value="NO" />
 			<input type="submit" name="sub2" value="NO" />
-			<input type="image" name="sub3" value="NO" src="submit.gif" />
+			<input type="image" name="sub3" value="NO" />
 			<button name="sub4" type="submit" value="NO">NO</button>
 			<input name="D1" type="text" value="NO" disabled="disabled" />
 			<input type="checkbox" checked="checked" disabled="disabled" name="D2" value="NO" />
diff --git a/test/unit/core.js b/test/unit/core.js
@@ -551,7 +551,7 @@ test("append(String|Element|Array&lt;Element&gt;|jQuery)", function() {
 	reset();
 	var pass = true;
 	try {
-		$( $("iframe")[0].contentWindow.document.body ).append("<div>test</div>");
+		$( $("#iframe")[0].contentWindow.document.body ).append("<div>test</div>");
 	} catch(e) {
 		pass = false;
 	}
@@ -1188,9 +1188,28 @@ test("map()", function() {
 });
 
 test("contents()", function() {
-	expect(2);
+	expect(10);
 	equals( $("#ap").contents().length, 9, "Check element contents" );
 	ok( $("#iframe").contents()[0], "Check existance of IFrame document" );
-	// Disabled, randomly fails
-	//ok( $("#iframe").contents()[0].body, "Check existance of IFrame body" );
+	var ibody = $("#loadediframe").contents()[0].body;
+	ok( ibody, "Check existance of IFrame body" );
+
+	equals( $("span", ibody).text(), "span text", "Find span in IFrame and check its text" );
+
+	$(ibody).append("<div>init text</div>");
+	equals( $("div", ibody).length, 2, "Check the original div and the new div are in IFrame" );
+
+	equals( $("div:last", ibody).text(), "init text", "Add text to div in IFrame" );
+
+	$("div:last", ibody).text("div text");
+	equals( $("div:last", ibody).text(), "div text", "Add text to div in IFrame" );
+
+	$("div:last", ibody).remove();
+	equals( $("div", ibody).length, 1, "Delete the div and check only one div left in IFrame" );
+
+	equals( $("div", ibody).text(), "span text", "Make sure the correct div is still left after deletion in IFrame" );
+
+	$("<table/>", ibody).append("<tr><td>cell</td></tr>").appendTo(ibody);
+	$("table", ibody).remove();
+	equals( $("div", ibody).length, 1, "Check for JS error on add and delete of a table in IFrame" );
 });

-Original file line number
+Diff line change
@@ @@ -0,0 +1,8 @@ @@
 +<html>
 +  <head>
 +    <title>iframe</title>
 +  </head>
 +  <body>
 +    <div><span>span text</span></div>
 +  </body>
 +</html>