diff --git a/layout/reftests/bugs/163504-1-inner.html b/layout/reftests/bugs/163504-1-inner.html
new file mode 100644
index 000000000000..85f9e15894e7
--- /dev/null
+++ b/layout/reftests/bugs/163504-1-inner.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block height</title>
+<style type="text/css">
+html, body { height: 100%; }
+div { height: 3%; }
+</style>
+</head>
+<body>
+
+<div><img src="mozilla-banner.gif" width="100" style="height: 50%"></div>
+<div><img src="mozilla-banner.gif" width="2" style="min-height: 50%"></div>
+<div><img src="mozilla-banner.gif" width="100" style="max-height: 50%"></div>
+
+<div><span style="position:relative; top: 30%">text</span></div>
+<div><span style="position:relative; bottom: 30%">text</span></div>
+
+</body>
+</html>
diff --git a/layout/reftests/bugs/163504-1-ref.html b/layout/reftests/bugs/163504-1-ref.html
new file mode 100644
index 000000000000..2bb2c3c1a6e3
--- /dev/null
+++ b/layout/reftests/bugs/163504-1-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block height</title>
+<style type="text/css">
+html, body { height: 100%; }
+iframe { width: 100%; }
+</style>
+</head>
+<body>
+<iframe style="height: 750px" src="163504-1-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/163504-1a.html b/layout/reftests/bugs/163504-1a.html
new file mode 100644
index 000000000000..a8db85184eb5
--- /dev/null
+++ b/layout/reftests/bugs/163504-1a.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block height</title>
+<style type="text/css">
+html, body { height: 100%; }
+iframe { width: 100%; }
+</style>
+<script type="application/javascript">
+
+function run() {
+    document.getElementById("toresize").style.height = "750px";
+}
+
+</script>
+</head>
+<body onload="run()">
+<iframe style="height: 1000px" id="toresize" src="163504-1-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/163504-1b.html b/layout/reftests/bugs/163504-1b.html
new file mode 100644
index 000000000000..3a372c4cb92a
--- /dev/null
+++ b/layout/reftests/bugs/163504-1b.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block height</title>
+<style type="text/css">
+html, body { height: 100%; }
+iframe { width: 100%; }
+</style>
+<script type="application/javascript">
+
+function run() {
+    document.getElementById("toresize").style.height = "750px";
+}
+
+</script>
+</head>
+<body onload="run()">
+<iframe style="height: 500px" id="toresize" src="163504-1-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/163504-2-inner.html b/layout/reftests/bugs/163504-2-inner.html
new file mode 100644
index 000000000000..991b70ced09d
--- /dev/null
+++ b/layout/reftests/bugs/163504-2-inner.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block height</title>
+<style type="text/css">
+html, body { height: 100%; }
+div { height: 3%; }
+</style>
+</head>
+<body>
+
+<div><span><img src="mozilla-banner.gif" width="100" style="height: 50%"></span></div>
+<div><span><img src="mozilla-banner.gif" width="2" style="min-height: 50%"></span></div>
+<div><span><img src="mozilla-banner.gif" width="100" style="max-height: 50%"></span></div>
+
+<div><span><span style="position:relative; top: 30%">text</span></span></div>
+<div><span><span style="position:relative; bottom: 30%">text</span></span></div>
+
+</body>
+</html>
diff --git a/layout/reftests/bugs/163504-2-ref.html b/layout/reftests/bugs/163504-2-ref.html
new file mode 100644
index 000000000000..07858dcd3307
--- /dev/null
+++ b/layout/reftests/bugs/163504-2-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block height</title>
+<style type="text/css">
+html, body { height: 100%; }
+iframe { width: 100%; }
+</style>
+</head>
+<body>
+<iframe style="height: 750px" src="163504-2-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/163504-2a.html b/layout/reftests/bugs/163504-2a.html
new file mode 100644
index 000000000000..e562faa424a4
--- /dev/null
+++ b/layout/reftests/bugs/163504-2a.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block height</title>
+<style type="text/css">
+html, body { height: 100%; }
+iframe { width: 100%; }
+</style>
+<script type="application/javascript">
+
+function run() {
+    document.getElementById("toresize").style.height = "750px";
+}
+
+</script>
+</head>
+<body onload="run()">
+<iframe style="height: 1000px" id="toresize" src="163504-2-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/163504-2b.html b/layout/reftests/bugs/163504-2b.html
new file mode 100644
index 000000000000..37f529412b5d
--- /dev/null
+++ b/layout/reftests/bugs/163504-2b.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block height</title>
+<style type="text/css">
+html, body { height: 100%; }
+iframe { width: 100%; }
+</style>
+<script type="application/javascript">
+
+function run() {
+    document.getElementById("toresize").style.height = "750px";
+}
+
+</script>
+</head>
+<body onload="run()">
+<iframe style="height: 500px" id="toresize" src="163504-2-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/28811-1-inner.html b/layout/reftests/bugs/28811-1-inner.html
new file mode 100644
index 000000000000..625fdc8a0b3b
--- /dev/null
+++ b/layout/reftests/bugs/28811-1-inner.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block width</title>
+<style type="text/css">
+</style>
+</head>
+<body>
+
+<div><span style="margin-right: 10%">text</span></div>
+<div><span style="margin-left: 10%">text</span></div>
+<div><img src="mozilla-banner.gif" height="10" style="margin-top: 2%"></div>
+<div><img src="mozilla-banner.gif" height="10" style="margin-right: 10%"></div>
+<div><img src="mozilla-banner.gif" height="10" style="margin-bottom: 2%"></div>
+<div><img src="mozilla-banner.gif" height="10" style="margin-left: 10%"></div>
+
+<div><span style="background:yellow; padding-top: 2%">text</span></div>
+<div><span style="background:yellow; padding-right: 10%">text</span></div>
+<div><span style="background:yellow; padding-bottom: 2%">text</span></div>
+<div><span style="background:yellow; padding-left: 10%">text</span></div>
+
+<div><img src="mozilla-banner.gif" height="10" style="width: 10%"></div>
+<div><img src="mozilla-banner.gif" height="2" style="min-width: 50%"></div>
+<div><img src="mozilla-banner.gif" height="10" style="max-width: 1%"></div>
+
+<div><span style="display:inline-block">This is an inline-block that contains enough text that its shrink-wrap width will be based on the available size in its container.  Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah.</span></div>
+<div><button>This is a button that contains enough text that its shrink-wrap width will be based on the available size in its container.  Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah.</button></div>
+<div><fieldset>This is a fieldset that contains enough text that its shrink-wrap width will be based on the available size in its container.  Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah.</fieldset></div>
+
+<div><span style="position:relative; right: 3%">text in a span</span></div>
+<div><span style="position:relative; left: 3%">text in a span</span></div>
+
+</body>
+</html>
diff --git a/layout/reftests/bugs/28811-1-ref.html b/layout/reftests/bugs/28811-1-ref.html
new file mode 100644
index 000000000000..99c806f9501c
--- /dev/null
+++ b/layout/reftests/bugs/28811-1-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block width</title>
+<style type="text/css">
+html, body, iframe { height: 100%; }
+</style>
+</head>
+<body>
+<iframe style="width: 750px" src="28811-1-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/28811-1a.html b/layout/reftests/bugs/28811-1a.html
new file mode 100644
index 000000000000..14d77d024994
--- /dev/null
+++ b/layout/reftests/bugs/28811-1a.html
@@ -0,0 +1,19 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block width</title>
+<style type="text/css">
+html, body, iframe { height: 100%; }
+</style>
+<script type="application/javascript">
+
+function run() {
+    document.getElementById("toresize").style.width = "750px";
+}
+
+</script>
+</head>
+<body onload="run()">
+<iframe style="width: 1000px" id="toresize" src="28811-1-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/28811-1b.html b/layout/reftests/bugs/28811-1b.html
new file mode 100644
index 000000000000..ee854c18f26f
--- /dev/null
+++ b/layout/reftests/bugs/28811-1b.html
@@ -0,0 +1,19 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block width</title>
+<style type="text/css">
+html, body, iframe { height: 100%; }
+</style>
+<script type="application/javascript">
+
+function run() {
+    document.getElementById("toresize").style.width = "750px";
+}
+
+</script>
+</head>
+<body onload="run()">
+<iframe style="width: 500px" id="toresize" src="28811-1-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/28811-2-inner.html b/layout/reftests/bugs/28811-2-inner.html
new file mode 100644
index 000000000000..c39e3611be0a
--- /dev/null
+++ b/layout/reftests/bugs/28811-2-inner.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block width</title>
+<style type="text/css">
+</style>
+</head>
+<body>
+
+<div><span><span style="margin-right: 10%">text</span></span></div>
+<div><span><span style="margin-left: 10%">text</span></span></div>
+<div><span><img src="mozilla-banner.gif" height="10" style="margin-top: 2%"></span></div>
+<div><span><img src="mozilla-banner.gif" height="10" style="margin-right: 10%"></span></div>
+<div><span><img src="mozilla-banner.gif" height="10" style="margin-bottom: 2%"></span></div>
+<div><span><img src="mozilla-banner.gif" height="10" style="margin-left: 10%"></span></div>
+
+<div><span><span style="background:yellow; padding-top: 2%">text</span></span></div>
+<div><span><span style="background:yellow; padding-right: 10%">text</span></span></div>
+<div><span><span style="background:yellow; padding-bottom: 2%">text</span></span></div>
+<div><span><span style="background:yellow; padding-left: 10%">text</span></span></div>
+
+<div><span><img src="mozilla-banner.gif" height="10" style="width: 10%"></span></div>
+<div><span><img src="mozilla-banner.gif" height="2" style="min-width: 50%"></span></div>
+<div><span><img src="mozilla-banner.gif" height="10" style="max-width: 1%"></span></div>
+
+<div><span><span style="display:inline-block">This is an inline-block that contains enough text that its shrink-wrap width will be based on the available size in its container.  Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah.</span></span></div>
+<div><span><button>This is a button that contains enough text that its shrink-wrap width will be based on the available size in its container.  Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah.</button></span></div>
+<div><span><fieldset>This is a fieldset that contains enough text that its shrink-wrap width will be based on the available size in its container.  Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah.</fieldset></span></div>
+
+<div><span><span style="position:relative; right: 3%">text in a span</span></span></div>
+<div><span><span style="position:relative; left: 3%">text in a span</span></span></div>
+
+</body>
+</html>
diff --git a/layout/reftests/bugs/28811-2-ref.html b/layout/reftests/bugs/28811-2-ref.html
new file mode 100644
index 000000000000..e9d22646855a
--- /dev/null
+++ b/layout/reftests/bugs/28811-2-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block width</title>
+<style type="text/css">
+html, body, iframe { height: 100%; }
+</style>
+</head>
+<body>
+<iframe style="width: 750px" src="28811-2-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/28811-2a.html b/layout/reftests/bugs/28811-2a.html
new file mode 100644
index 000000000000..b1fc1166d6ee
--- /dev/null
+++ b/layout/reftests/bugs/28811-2a.html
@@ -0,0 +1,19 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block width</title>
+<style type="text/css">
+html, body, iframe { height: 100%; }
+</style>
+<script type="application/javascript">
+
+function run() {
+    document.getElementById("toresize").style.width = "750px";
+}
+
+</script>
+</head>
+<body onload="run()">
+<iframe style="width: 1000px" id="toresize" src="28811-2-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/bugs/28811-2b.html b/layout/reftests/bugs/28811-2b.html
new file mode 100644
index 000000000000..a66b9305d20a
--- /dev/null
+++ b/layout/reftests/bugs/28811-2b.html
@@ -0,0 +1,19 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase for resizing elements that depend on containing block width</title>
+<style type="text/css">
+html, body, iframe { height: 100%; }
+</style>
+<script type="application/javascript">
+
+function run() {
+    document.getElementById("toresize").style.width = "750px";
+}
+
+</script>
+</head>
+<body onload="run()">
+<iframe style="width: 500px" id="toresize" src="28811-2-inner.html"></iframe>
+</body>
+</html>
diff --git a/layout/reftests/reftest.list b/layout/reftests/reftest.list
index 92ad30f917d4..cf57bf4d54a5 100644
--- a/layout/reftests/reftest.list
+++ b/layout/reftests/reftest.list
@@ -33,7 +33,15 @@
 == bugs/18217-zorder-3.html bugs/18217-zorder-ref-inline.html
 == bugs/18217-zorder-4.html bugs/18217-zorder-ref-inline.html
 == bugs/18217-zorder-5.html bugs/18217-zorder-ref-inline.html
+== bugs/28811-1a.html bugs/28811-1-ref.html
+== bugs/28811-1b.html bugs/28811-1-ref.html
+== bugs/28811-2a.html bugs/28811-2-ref.html
+== bugs/28811-2b.html bugs/28811-2-ref.html
 == bugs/142233-1.html bugs/142233-1-ref.html
+== bugs/163504-1a.html bugs/163504-1-ref.html
+== bugs/163504-1b.html bugs/163504-1-ref.html
+== bugs/163504-2a.html bugs/163504-2-ref.html
+== bugs/163504-2b.html bugs/163504-2-ref.html
 == bugs/328829-1.xhtml bugs/328829-1-ref.xhtml
 == bugs/328829-2.xhtml bugs/328829-2-ref.xhtml
 == bugs/339289-1.html bugs/339289-1-ref.html
