diff --git a/components/script/parse/html.rs b/components/script/parse/html.rs
index ce7b75f9338..3fc60d8c7c8 100644
--- a/components/script/parse/html.rs
+++ b/components/script/parse/html.rs
@@ -274,7 +274,9 @@ pub fn parse_html(document: JSRef<Document>,
                     parser.parse_chunk(data);
                 }
                 ProgressMsg::Done(Err(err)) => {
-                    panic!("Failed to load page URL {}, error: {}", url.serialize(), err);
+                    debug!("Failed to load page URL {}, error: {}", url.serialize(), err);
+                    // TODO(Savago): we should send a notification to callers #5463.
+                    break;
                 }
                 ProgressMsg::Done(Ok(())) => break,
             }
diff --git a/tests/wpt/metadata/html/browsers/history/the-location-interface/security_location_0.sub.htm.ini b/tests/wpt/metadata/html/browsers/history/the-location-interface/security_location_0.sub.htm.ini
index 71a53f995de..a09e291d45b 100644
--- a/tests/wpt/metadata/html/browsers/history/the-location-interface/security_location_0.sub.htm.ini
+++ b/tests/wpt/metadata/html/browsers/history/the-location-interface/security_location_0.sub.htm.ini
@@ -1,3 +1,6 @@
 [security_location_0.sub.htm]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
+  [Accessing location object from different origins doesn\'t raise SECURITY_ERR exception]
+    expected: NOTRUN
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/security-window/window-security.sub.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/security-window/window-security.sub.html.ini
index 047d3a00e60..b5a20e9a276 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/security-window/window-security.sub.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/security-window/window-security.sub.html.ini
@@ -1,3 +1,6 @@
 [window-security.sub.html]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
+  [Window Security testing]
+    expected: NOTRUN
+