diff --git a/layout/reftests/bugs/373383-1-ref.html b/layout/reftests/bugs/373383-1-ref.html
new file mode 100644
index 000000000000..43e778f44dcd
--- /dev/null
+++ b/layout/reftests/bugs/373383-1-ref.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <style type="text/css">
+    #a { width: 15em; border: 1px solid black; }
+    #b { float: right; width: 8em; height: 3em; background: #ccc; }
+  </style>
+</head>
+<body>
+  <div id="a">
+    <div id="b">float right</div>xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+    <div>Long text long text long text long text long text long text long text long text long text long text long text long text long text</div>
+  </div>
+  
+</body>
+</html>
diff --git a/layout/reftests/bugs/373383-1.html b/layout/reftests/bugs/373383-1.html
new file mode 100644
index 000000000000..62ccd58ddca1
--- /dev/null
+++ b/layout/reftests/bugs/373383-1.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <style type="text/css">
+    #a { width: 15em; border: 1px solid black; }
+    #b { float: right; width: 8em; height: 3em; background: #ccc; }
+  </style>
+</head>
+<body>
+  <div id="a">
+    <div id="b">float right</div>
+    <div>Long text long text long text long text long text long text long text long text long text long text long text long text long text</div>
+  </div>
+  
+  <script>
+  var longWord = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
+
+  document.body.offsetWidth;
+  n = document.getElementById("b").nextSibling;
+  n.data = longWord + n.data;
+  
+  </script>
+</body>
+</html>
diff --git a/layout/reftests/bugs/383883-1-ref.html b/layout/reftests/bugs/383883-1-ref.html
new file mode 100644
index 000000000000..e3d57faa9fb0
--- /dev/null
+++ b/layout/reftests/bugs/383883-1-ref.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<body>
+<div style="float:right; height: 50px; width: 20px; background: red"></div>
+<div id=a style="border-top: solid 0px">
+<div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange; position:relative;"></div>
+</div>
+<div>
+asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>
+<div id=rand style="height:1px"></div>
+</div>
diff --git a/layout/reftests/bugs/383883-1.html b/layout/reftests/bugs/383883-1.html
new file mode 100644
index 000000000000..fc0cf63facc5
--- /dev/null
+++ b/layout/reftests/bugs/383883-1.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<body onload="document.getElementById('a').style.borderTopWidth=0;document.getElementById('rand').style.height='1px';">
+<div style="float:right; height: 50px; width: 20px; background: red"></div>
+<div id=a style="border-top: solid 50px">
+<div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange; position:relative;"></div>
+</div>
+<div>
+asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>
+<div id=rand></div>
+</div>
diff --git a/layout/reftests/bugs/383883-2-ref.html b/layout/reftests/bugs/383883-2-ref.html
new file mode 100644
index 000000000000..1caec494146c
--- /dev/null
+++ b/layout/reftests/bugs/383883-2-ref.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<body>
+<div style="float:left; width:0; height:60px"></div>
+<div style="background: red; float: right; height: 50px; width: 20px; clear:left"></div>
+<div id="a" style="border-top: solid 0px;">
+  <div id="b" style="border: solid orange; float: left; clear: right; width: 100px; height: 100px; position: relative;"></div>
+</div>
+<div>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+<div id=rand style="height:1px"></div>
+</div>
diff --git a/layout/reftests/bugs/383883-2.html b/layout/reftests/bugs/383883-2.html
new file mode 100644
index 000000000000..c4a97a78f1d8
--- /dev/null
+++ b/layout/reftests/bugs/383883-2.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<body onload="document.getElementById('a').style.borderTopWidth=0;document.getElementById('rand').style.height='1px';">
+<div style="float:left; width:0; height:60px"></div>
+<div style="background: red; float: right; height: 50px; width: 20px; clear:left"></div>
+<div id="a" style="border-top: solid 50px;">
+  <div id="b" style="border: solid orange; float: left; clear: right; width: 100px; height: 100px; position: relative;"></div>
+</div>
+<div>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+<div id=rand></div>
+</div>
diff --git a/layout/reftests/bugs/383883-3-ref.html b/layout/reftests/bugs/383883-3-ref.html
new file mode 100644
index 000000000000..2fecae186090
--- /dev/null
+++ b/layout/reftests/bugs/383883-3-ref.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<body>
+<div style="float:right; height: 50px; width: 20px; background: red"></div>
+<div id=a style="border-top: solid 0px">
+<div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange; position:relative;"></div>
+</div>
+<div>
+asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>
+</div>
diff --git a/layout/reftests/bugs/383883-3.html b/layout/reftests/bugs/383883-3.html
new file mode 100644
index 000000000000..ecc9f95c4efb
--- /dev/null
+++ b/layout/reftests/bugs/383883-3.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<body onload="document.getElementById('a').style.borderTopWidth=0;">
+<div style="float:right; height: 50px; width: 20px; background: red"></div>
+<div id=a style="border-top: solid 50px">
+<div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange; position:relative;"></div>
+</div>
+<div>
+asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>
+</div>
diff --git a/layout/reftests/bugs/383883-4-ref.html b/layout/reftests/bugs/383883-4-ref.html
new file mode 100644
index 000000000000..cdf08b140692
--- /dev/null
+++ b/layout/reftests/bugs/383883-4-ref.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<body>
+<div style="float:left; width:0; height:60px"></div>
+<div style="background: red; float: right; height: 50px; width: 20px; clear:left"></div>
+<div id="a" style="border-top: solid 0px;">
+  <div id="b" style="border: solid orange; float: left; clear: right; width: 100px; height: 100px; position: relative;"></div>
+</div>
+<div>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+</div>
diff --git a/layout/reftests/bugs/383883-4.html b/layout/reftests/bugs/383883-4.html
new file mode 100644
index 000000000000..09eeb2f1227d
--- /dev/null
+++ b/layout/reftests/bugs/383883-4.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<body onload="document.getElementById('a').style.borderTopWidth=0;">
+<div style="float:left; width:0; height:60px"></div>
+<div style="background: red; float: right; height: 50px; width: 20px; clear:left"></div>
+<div id="a" style="border-top: solid 50px;">
+  <div id="b" style="border: solid orange; float: left; clear: right; width: 100px; height: 100px; position: relative;"></div>
+</div>
+<div>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+asdf<br>
+</div>
diff --git a/layout/reftests/bugs/383884-1-ref.html b/layout/reftests/bugs/383884-1-ref.html
new file mode 100644
index 000000000000..9c6f88de94c7
--- /dev/null
+++ b/layout/reftests/bugs/383884-1-ref.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<body>
+<div style="float:right; height: 50px; width: 20px; background: red"></div>
+<div id=a style="border-top: solid 0px"></div>
+<div>
+<div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange; position:relative;"></div>
+</div>
+<div>
+asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>
diff --git a/layout/reftests/bugs/383884-1.html b/layout/reftests/bugs/383884-1.html
new file mode 100644
index 000000000000..8dac4f3e0b42
--- /dev/null
+++ b/layout/reftests/bugs/383884-1.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<body onload="document.getElementById('a').style.borderTopWidth=0;">
+<div style="float:right; height: 50px; width: 20px; background: red"></div>
+<div id=a style="border-top: solid 50px"></div>
+<div>
+<div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange; position:relative;"></div>
+</div>
+<div>
+asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>
diff --git a/layout/reftests/bugs/383885-1-ref.html b/layout/reftests/bugs/383885-1-ref.html
new file mode 100644
index 000000000000..68f4fe644b63
--- /dev/null
+++ b/layout/reftests/bugs/383885-1-ref.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<body>
+<div style="float:left; width:10px; height:500px; background:blue"></div>
+<div style="float:right; height: 50px; width: 20px; background: red"></div>
+<div><span id=a style="display:none">a<br></span>
+<div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange;"></div>
+asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf
diff --git a/layout/reftests/bugs/383885-1.html b/layout/reftests/bugs/383885-1.html
new file mode 100644
index 000000000000..df96fffb33af
--- /dev/null
+++ b/layout/reftests/bugs/383885-1.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<body onload="document.getElementById('a').style.display='none';">
+<div style="float:left; width:10px; height:500px; background:blue"></div>
+<div style="float:right; height: 50px; width: 20px; background: red"></div>
+<div><span id=a>a<br></span>
+<div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange;"></div>
+asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index a2f352d5a4d6..99b78f57a966 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -299,6 +299,7 @@ fails == 368504-2.html 368504-2-ref.html # bug 368504
 == 373433-1.html 373433-1-ref.html
 == 372062-1.html 372062-1-ref.html
 == 372768-1.html 372768-1-ref.html
+== 373383-1.html 373383-1-ref.html
 == 374038-1.xul 374038-1-ref.xul
 == 374038-2.xul 374038-2-ref.xul
 == 374193-1.xhtml about:blank
@@ -331,6 +332,12 @@ random-if(MOZ_WIDGET_TOOLKIT=="cocoa") == 379316-2.html 379316-2-ref.html # bug
 == 381507-1.html 381507-1-ref.html
 == 382600-1.html 382600-1-ref.html
 == 383551-1.html 383551-1-ref.html
+== 383883-1.html 383883-1-ref.html
+== 383883-2.html 383883-2-ref.html
+== 383883-3.html 383883-3-ref.html
+== 383883-4.html 383883-4-ref.html
+== 383884-1.html 383884-1-ref.html
+== 383885-1.html 383885-1-ref.html
 == 384576-1.html 384576-1-ref.html
 == 384762-1.html about:blank
 == 384876-1.html 384876-1-ref.html
