diff --git a/components/layout/flow.rs b/components/layout/flow.rs
index bfb0c407d95..2df03d43233 100644
--- a/components/layout/flow.rs
+++ b/components/layout/flow.rs
@@ -251,13 +251,6 @@ pub trait Flow: fmt::Debug + Sync + Send + 'static {
                                                                       container_size);
                     overflow = overflow.union(&kid_overflow.translate(&kid_position.origin))
                 }
-
-                for kid in mut_base(self).abs_descendants.iter() {
-                    let kid_overflow = base(kid).overflow;
-                    let kid_position = base(kid).position.to_physical(base(kid).writing_mode,
-                                                                      container_size);
-                    overflow = overflow.union(&kid_overflow.translate(&kid_position.origin))
-                }
             }
             _ => {}
         }
diff --git a/tests/html/overflow-bug-0.html b/tests/html/overflow-bug-0.html
new file mode 100644
index 00000000000..10e2207ca56
--- /dev/null
+++ b/tests/html/overflow-bug-0.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<!-- https://github.com/servo/servo/issues/9306 -->
+<style>
+  body {
+    margin: 0;
+  }
+
+  .green {
+    background: #0F0;
+    height: 40px;
+    width: 600px;
+    margin-left: -300px;
+  }
+</style>
+
+<div class="green">
+</div>
+
diff --git a/tests/html/overflow-bug-1.html b/tests/html/overflow-bug-1.html
new file mode 100644
index 00000000000..1a11bf1320f
--- /dev/null
+++ b/tests/html/overflow-bug-1.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<!-- https://github.com/servo/servo/issues/9306 -->
+<style>
+  body {
+    margin: 0;
+  }
+
+  .green {
+    background: #0F0;
+    height: 40px;
+    width: 400px;
+    top: 40px;
+    left: 50%;
+    margin-left: -300px;
+    position: absolute;
+    padding: 0px 100px;
+  }
+
+  .red {
+    background: #F00;
+    position: absolute;
+    right: 0;
+  }
+
+</style>
+
+<div class="green">
+  <span class="red">x</span>
+</div>
diff --git a/tests/html/overflow-bug-2.html b/tests/html/overflow-bug-2.html
new file mode 100644
index 00000000000..1251b6de34c
--- /dev/null
+++ b/tests/html/overflow-bug-2.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<!-- https://github.com/servo/servo/issues/9309 -->
+<style>
+  body {
+    margin: 0;
+  }
+
+  .a {
+    background: red;
+    width: 100%;
+    height: 100%;
+    position: absolute;
+    overflow: hidden;
+  }
+
+  .b {
+    background: green;
+    width: 40px;
+    height: 40px;
+    position: absolute;
+    right: -40px;
+  }
+
+</style>
+
+<div class="a">
+  <div class="b"></div>
+</div>
diff --git a/tests/wpt/metadata-css/css21_dev/html4/numbers-units-018.htm.ini b/tests/wpt/metadata-css/css21_dev/html4/numbers-units-018.htm.ini
deleted file mode 100644
index 232a3f71a50..00000000000
--- a/tests/wpt/metadata-css/css21_dev/html4/numbers-units-018.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[numbers-units-018.htm]
-  type: reftest
-  expected: FAIL
