diff --git a/layout/reftests/text/control-chars-04-notref.html b/layout/reftests/text/control-chars-04-notref.html
new file mode 100644
index 000000000000..97509ce9670e
--- /dev/null
+++ b/layout/reftests/text/control-chars-04-notref.html
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+foobar
+
+
+
diff --git a/layout/reftests/text/control-chars-04a.html b/layout/reftests/text/control-chars-04a.html
new file mode 100644
index 000000000000..9a8e3332db2c
--- /dev/null
+++ b/layout/reftests/text/control-chars-04a.html
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+foobar
+
+
+
diff --git a/layout/reftests/text/control-chars-04b.html b/layout/reftests/text/control-chars-04b.html
new file mode 100644
index 000000000000..48e24b03850c
--- /dev/null
+++ b/layout/reftests/text/control-chars-04b.html
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+foo bar
+
+
+
diff --git a/layout/reftests/text/control-chars-04c.html b/layout/reftests/text/control-chars-04c.html
new file mode 100644
index 000000000000..fd5f892c9433
--- /dev/null
+++ b/layout/reftests/text/control-chars-04c.html
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+foobar
+
+
+
diff --git a/layout/reftests/text/control-chars-04d.html b/layout/reftests/text/control-chars-04d.html
new file mode 100644
index 000000000000..94623baeb674
--- /dev/null
+++ b/layout/reftests/text/control-chars-04d.html
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+foobar
+
+
+
diff --git a/layout/reftests/text/reftest.list b/layout/reftests/text/reftest.list
index 2a8a30a1c508..d954221543e8 100644
--- a/layout/reftests/text/reftest.list
+++ b/layout/reftests/text/reftest.list
@@ -305,7 +305,7 @@ fails-if(!cocoaWidget||OSX==1006||OSX==1007) != osx-font-smoothing-2.html osx-fo
pref(layout.css.text-align-true-value.enabled,true) == text-align-true.html text-align-true-ref.html
-# stray control chars should not be invisible, bug 909344
+# stray control chars should be visible by default, bug 1099557
!= control-chars-01a.html control-chars-01-notref.html
!= control-chars-01b.html control-chars-01-notref.html
!= control-chars-01c.html control-chars-01-notref.html
@@ -313,6 +313,10 @@ pref(layout.css.text-align-true-value.enabled,true) == text-align-true.html text
!= control-chars-02.html control-chars-02-notref.html
== control-chars-03a.html control-chars-03-ref.html
== control-chars-03b.html control-chars-03-ref.html
+!= control-chars-04a.html control-chars-04-notref.html
+!= control-chars-04b.html control-chars-04-notref.html
+!= control-chars-04c.html control-chars-04-notref.html
+!= control-chars-04d.html control-chars-04-notref.html
# font fallback for when not supported in the primary font family - bug 970891
HTTP(..) == space-font-1.html space-font-1-ref.html