diff --git a/plugins/restiming.js b/plugins/restiming.js
index 18e12684f..e9d752980 100644
--- a/plugins/restiming.js
+++ b/plugins/restiming.js
@@ -31,7 +31,10 @@ see: http://www.w3.org/TR/resource-timing/
 		// sendBeacon: https://developer.mozilla.org/en-US/docs/Web/API/Navigator/sendBeacon
 		"beacon": 8,
 		// Fetch API: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API
-		"fetch": 9
+		"fetch": 9,
+		"iframe": "a",
+		// IE11 and Edge (some versions) send "subdocument" instead of "iframe"
+		"subdocument": "a"
 	};
 
 	// https://html.spec.whatwg.org/multipage/links.html#linkTypes
diff --git a/tests/page-templates/06-bugs/issue-606.html b/tests/page-templates/06-bugs/issue-606.html
new file mode 100644
index 000000000..a8f12798c
--- /dev/null
+++ b/tests/page-templates/06-bugs/issue-606.html
@@ -0,0 +1,16 @@
+<%= header %>
+<script src="../../vendor/resourcetiming-compression/src/resourcetiming-decompression.js" type="text/javascript"></script>
+<%= boomerangSnippet %>
+<script src="issue-606.js" type="text/javascript"></script>
+<link rel="stylesheet" href="support/09.css" />
+<iframe src="support/92542-iframe.html"></iframe>
+<script>
+BOOMR_test.init({
+	testAfterOnBeacon: true,
+	ResourceTiming: {
+		enabled: true,
+		trackedResourceTypes: ["css", "iframe", "subdocument"]
+	}
+});
+</script>
+<%= footer %>
diff --git a/tests/page-templates/06-bugs/issue-606.js b/tests/page-templates/06-bugs/issue-606.js
new file mode 100644
index 000000000..aca932a58
--- /dev/null
+++ b/tests/page-templates/06-bugs/issue-606.js
@@ -0,0 +1,29 @@
+/*eslint-env mocha*/
+/*global BOOMR_test,assert*/
+
+describe("e2e/06-bug/issue-606", function() {
+	var t = BOOMR_test;
+	var tf = BOOMR.plugins.TestFramework;
+
+	it("Should pass basic beacon validation", function(done) {
+		t.validateBeaconWasSent(done);
+	});
+
+	it("Should only have one iframe and one CSS in the filter (if ResourceTiming is supported)", function() {
+		if (t.isResourceTimingSupported()) {
+			var b = tf.lastBeacon();
+
+			var resources = ResourceTimingDecompression.decompressResources(JSON.parse(b.restiming));
+
+			assert.equal(resources.length, 2);
+
+			// find our iframe
+			assert.equal(resources[0].initiatorType, "other");
+			assert.include(resources[0].name, "support/92542-iframe.html");
+
+			// find our css
+			assert.equal(resources[1].initiatorType, "css");
+			assert.include(resources[1].name, "support/img.jpg");
+		}
+	});
+});
diff --git a/tests/page-templates/06-bugs/support/09.css b/tests/page-templates/06-bugs/support/09.css
new file mode 100644
index 000000000..39c519269
--- /dev/null
+++ b/tests/page-templates/06-bugs/support/09.css
@@ -0,0 +1,3 @@
+body {
+  background-image: url("img.jpg")
+}