diff --git a/layout/reftests/forms/placeholder/placeholder-15.html b/layout/reftests/forms/placeholder/placeholder-15.html
deleted file mode 100644
index 19fc8eb745c..00000000000
--- a/layout/reftests/forms/placeholder/placeholder-15.html
+++ /dev/null
@@ -1,19 +0,0 @@
-<!DOCTYPE html>
-<html class="reftest-wait">
-  <link rel='stylesheet' type='text/css' href='placeholder-style.css'>
-  <!-- Test: when focused, element should show placeholder. -->
-  <script type="text/javascript">
-    function focusPlaceholder()
-    {
-      document.getElementById('p1').focus();
-    }
-    function disableReftestWait()
-    {
-      document.documentElement.className = '';
-    }
-  </script>
-
-  <body onload="focusPlaceholder();">
-    <input type="text" id="p1" value="" placeholder="my placeholder" onfocus="disableReftestWait();">
-  </body>
-</html>
diff --git a/layout/reftests/forms/placeholder/placeholder-16.html b/layout/reftests/forms/placeholder/placeholder-16.html
deleted file mode 100644
index 9c1ac995aa6..00000000000
--- a/layout/reftests/forms/placeholder/placeholder-16.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<html class="reftest-wait">
-  <link rel='stylesheet' type='text/css' href='placeholder-style.css'>
-  <!-- Test: when focused, if value='', newest placeholder should be shown. -->
-  <script type="text/javascript">
-    function focusPlaceholder()
-    {
-      document.getElementById('p1').focus();
-    }
-    function setPlaceholder()
-    {
-      document.getElementById('p1').placeholder = 'my placeholder';
-    }
-    function disableReftestWait()
-    {
-      document.documentElement.className = '';
-    }
-  </script>
-
-  <body onload="focusPlaceholder();">
-    <input type="text" id="p1" value="" placeholder="old placeholder" onfocus="setPlaceholder(); disableReftestWait();">
-  </body>
-</html>
diff --git a/layout/reftests/forms/placeholder/placeholder-17.html b/layout/reftests/forms/placeholder/placeholder-17.html
deleted file mode 100644
index 35155c0120a..00000000000
--- a/layout/reftests/forms/placeholder/placeholder-17.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<html class="reftest-wait">
-  <link rel='stylesheet' type='text/css' href='placeholder-style.css'>
-  <!-- Test: when focused, value reset should show placeholder. -->
-  <script type="text/javascript">
-    function focusPlaceholder()
-    {
-      document.getElementById('p1').focus();
-    }
-    function resetValue()
-    {
-      document.getElementById('p1').value = '';
-    }
-    function disableReftestWait()
-    {
-      document.documentElement.className = '';
-    }
-  </script>
-
-  <body onload="focusPlaceholder();">
-    <input type="text" id="p1" value="my value" placeholder="my placeholder" onfocus="resetValue(); disableReftestWait();">
-  </body>
-</html>
diff --git a/layout/reftests/forms/placeholder/reftest.list b/layout/reftests/forms/placeholder/reftest.list
index 68bb4f133b7..ac39eebeb7d 100644
--- a/layout/reftests/forms/placeholder/reftest.list
+++ b/layout/reftests/forms/placeholder/reftest.list
@@ -16,9 +16,6 @@ needs-focus == placeholder-10.html placeholder-visible-ref.html
 == placeholder-12.html placeholder-visible-ref.html
 == placeholder-13.html placeholder-visible-ref.html
 == placeholder-14.html placeholder-visible-ref.html
-needs-focus == placeholder-15.html placeholder-focus-ref.html
-needs-focus == placeholder-16.html placeholder-focus-ref.html
-needs-focus == placeholder-17.html placeholder-focus-ref.html
 == placeholder-18.html placeholder-overridden-ref.html
 == placeholder-19.xul  placeholder-overridden-ref.xul
 needs-focus == placeholder-20.html placeholder-focus-ref.html
