diff --git a/components/script/dom/node.rs b/components/script/dom/node.rs
index c82fbb49e88..ec72b6eed2f 100644
--- a/components/script/dom/node.rs
+++ b/components/script/dom/node.rs
@@ -1051,21 +1051,18 @@ pub struct FollowingNodeIterator {
     root: Root<Node>,
 }
 
-impl Iterator for FollowingNodeIterator {
-    type Item = Root<Node>;
-
-    // https://dom.spec.whatwg.org/#concept-tree-following
-    fn next(&mut self) -> Option<Root<Node>> {
+impl FollowingNodeIterator {
+    /// Skips iterating the children of the current node
+    pub fn next_skipping_children(&mut self) -> Option<Root<Node>> {
         let current = match self.current.take() {
             None => return None,
             Some(current) => current,
         };
 
-        if let Some(first_child) = current.GetFirstChild() {
-            self.current = Some(first_child);
-            return current.GetFirstChild()
-        }
+        self.next_skipping_children_impl(current)
+    }
 
+    fn next_skipping_children_impl(&mut self, current: Root<Node>) -> Option<Root<Node>> {
         if self.root == current {
             self.current = None;
             return None;
@@ -1090,6 +1087,25 @@ impl Iterator for FollowingNodeIterator {
     }
 }
 
+impl Iterator for FollowingNodeIterator {
+    type Item = Root<Node>;
+
+    // https://dom.spec.whatwg.org/#concept-tree-following
+    fn next(&mut self) -> Option<Root<Node>> {
+        let current = match self.current.take() {
+            None => return None,
+            Some(current) => current,
+        };
+
+        if let Some(first_child) = current.GetFirstChild() {
+            self.current = Some(first_child);
+            return current.GetFirstChild()
+        }
+
+        self.next_skipping_children_impl(current)
+    }
+}
+
 pub struct PrecedingNodeIterator {
     current: Option<Root<Node>>,
     root: Root<Node>,
diff --git a/components/script/dom/range.rs b/components/script/dom/range.rs
index 88fc9ad35bc..df3d0d35883 100644
--- a/components/script/dom/range.rs
+++ b/components/script/dom/range.rs
@@ -750,7 +750,7 @@ impl RangeMethods for Range {
             if let Some(text) = start_node.downcast::<CharacterData>() {
                 return text.ReplaceData(start_offset,
                                         end_offset - start_offset,
-                                        DOMString::from(""));
+                                        DOMString::new());
             }
         }
 
@@ -758,10 +758,15 @@ impl RangeMethods for Range {
         let mut contained_children: RootedVec<JS<Node>> = RootedVec::new();
         let ancestor = self.CommonAncestorContainer();
 
-        for child in start_node.following_nodes(ancestor.r()) {
-            if self.contains(child.r()) &&
-               !contained_children.contains(&JS::from_ref(child.GetParentNode().unwrap().r())) {
+        let mut iter = start_node.following_nodes(ancestor.r());
+
+        let mut next = iter.next();
+        while let Some(child) = next {
+            if self.contains(child.r()) {
                 contained_children.push(JS::from_ref(child.r()));
+                next = iter.next_skipping_children();
+            } else {
+                next = iter.next();
             }
         }
 
@@ -778,7 +783,7 @@ impl RangeMethods for Range {
                     }
                     reference_node = parent;
                 }
-                panic!()
+                unreachable!()
             }
 
             compute_reference(start_node.r(), end_node.r())
@@ -786,9 +791,9 @@ impl RangeMethods for Range {
 
         // Step 7.
         if let Some(text) = start_node.downcast::<CharacterData>() {
-            try!(text.ReplaceData(start_offset,
-                                  start_node.len() - start_offset,
-                                  DOMString::from("")));
+            text.ReplaceData(start_offset,
+                             start_node.len() - start_offset,
+                             DOMString::new()).unwrap();
         }
 
         // Step 8.
@@ -798,12 +803,13 @@ impl RangeMethods for Range {
 
         // Step 9.
         if let Some(text) = end_node.downcast::<CharacterData>() {
-            try!(text.ReplaceData(0, end_offset, DOMString::from("")));
+            text.ReplaceData(0, end_offset, DOMString::new()).unwrap();
         }
 
         // Step 10.
-        try!(self.SetStart(new_node.r(), new_offset));
-        self.SetEnd(new_node.r(), new_offset)
+        self.SetStart(new_node.r(), new_offset).unwrap();
+        self.SetEnd(new_node.r(), new_offset).unwrap();
+        Ok(())
     }
 
     // https://dom.spec.whatwg.org/#dom-range-surroundcontents
diff --git a/tests/wpt/metadata/dom/ranges/Range-deleteContents.html.ini b/tests/wpt/metadata/dom/ranges/Range-deleteContents.html.ini
deleted file mode 100644
index d026b7aaa35..00000000000
--- a/tests/wpt/metadata/dom/ranges/Range-deleteContents.html.ini
+++ /dev/null
@@ -1,23 +0,0 @@
-[Range-deleteContents.html]
-  type: testharness
-  [Resulting DOM for range 24 [document, 0, document, 2\]]
-    expected: FAIL
-
-  [Resulting DOM for range 10 [document.documentElement, 0, document.documentElement, 1\]]
-    expected: FAIL
-
-  [Resulting DOM for range 11 [document.documentElement, 0, document.documentElement, 2\]]
-    expected: FAIL
-
-  [Resulting DOM for range 12 [document.documentElement, 1, document.documentElement, 2\]]
-    expected: FAIL
-
-  [Resulting DOM for range 15 [foreignDoc.documentElement, 0, foreignDoc.documentElement, 1\]]
-    expected: FAIL
-
-  [Resulting DOM for range 27 [foreignDoc, 1, foreignComment, 2\]]
-    expected: FAIL
-
-  [Resulting DOM for range 49 [document, 1, document, 2\]]
-    expected: FAIL
-