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-rw-r--r--layout/reftests/css-valuesandunits/ch-width-1-ref.html41
-rw-r--r--layout/reftests/css-valuesandunits/ch-width-1.html62
-rw-r--r--layout/reftests/css-valuesandunits/reftest.list19
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-div-fontsize.html13
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-div-width-inner.html13
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-div-width-outer.html13
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-iframe-inside.html7
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-iframe.html6
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-ref-iframe-inside.html7
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-ref-iframe.html6
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-ref-resource.svg4
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-ref-root-fontsize.html7
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-ref-root-width.html12
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-ref.html13
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-ref.svg5
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-ref2-root-fontsize.html7
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-resource.svg6
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-root-fontsize.html7
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem-root-width.html12
-rw-r--r--layout/reftests/css-valuesandunits/unit-rem.svg5
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-iframe.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-iframe.html21
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-ref-iframe.html37
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-ref.html15
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-iframe.html22
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-ref-iframe.html36
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-ref.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-iframe.html18
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-ref-iframe.html28
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-ref.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-iframe.html18
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-ref-iframe.html28
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-ref.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-ref-iframe.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-ref.html14
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-zoom-ref.html18
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw-zoom.html18
-rw-r--r--layout/reftests/css-valuesandunits/unit-vh-vw.html14
42 files changed, 678 insertions, 0 deletions
diff --git a/layout/reftests/css-valuesandunits/ch-width-1-ref.html b/layout/reftests/css-valuesandunits/ch-width-1-ref.html
new file mode 100644
index 0000000000..588234be72
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/ch-width-1-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<style>
+body {
+ font-family: courier new, courier, monospace;
+ line-height: 1;
+}
+div {
+ width: 120px;
+ float: left;
+}
+span {
+ display: inline-block;
+ height: 1em;
+ background: lightgreen;
+}
+</style>
+<p>No red should appear at the tips of the rectangles:</p>
+<script>
+for (var i = 10; i <= 16; i++) {
+ var div = document.createElement("div");
+ div.style.fontSize = i + "px";
+ document.body.appendChild(div);
+ for (var j = 1; j <= 10; j++) {
+ // green span containing the specified number of chars
+ var b = document.createElement("span");
+ b.className = "b";
+ b.textContent = "\xA0".repeat(j);
+ div.appendChild(b);
+ div.appendChild(document.createElement("br"));
+ div.appendChild(document.createElement("br"));
+ }
+ for (var j = 1; j <= 10; j++) {
+ var b = document.createElement("span");
+ b.className = "b";
+ b.textContent = "\xA0".repeat(j);
+ div.appendChild(b);
+ div.appendChild(document.createElement("br"));
+ div.appendChild(document.createElement("br"));
+ }
+}
+</script>
diff --git a/layout/reftests/css-valuesandunits/ch-width-1.html b/layout/reftests/css-valuesandunits/ch-width-1.html
new file mode 100644
index 0000000000..92cd7bdcf6
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/ch-width-1.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<style>
+body {
+ font-family: courier new, courier, monospace;
+ line-height: 1;
+}
+div {
+ width: 120px;
+ float: left;
+}
+span {
+ display: inline-block;
+ height: 1em;
+}
+span.a {
+ background: red;
+}
+span.b {
+ position: relative;
+ top: -1em;
+ height: 1em;
+ background: lightgreen;
+}
+</style>
+<p>No red should appear at the tips of the rectangles:</p>
+<script>
+for (var i = 10; i <= 16; i++) {
+ var div = document.createElement("div");
+ div.style.fontSize = i + "px";
+ document.body.appendChild(div);
+ for (var j = 1; j <= 10; j++) {
+ // create a red span with width specified in 'ch' units
+ var a = document.createElement("span");
+ a.className = "a";
+ a.style.width = j + "ch";
+ a.textContent = "\xA0";
+ div.appendChild(a);
+ div.appendChild(document.createElement("br"));
+ // overlay it with a green span containing the equivalent number of chars
+ var b = document.createElement("span");
+ b.className = "b";
+ b.textContent = "\xA0".repeat(j);
+ div.appendChild(b);
+ div.appendChild(document.createElement("br"));
+ }
+ for (var j = 1; j <= 10; j++) {
+ // create a red span containing a specific number of chars
+ var a = document.createElement("span");
+ a.className = "a";
+ a.textContent = "\xA0".repeat(j);
+ div.appendChild(a);
+ div.appendChild(document.createElement("br"));
+ // overlay it with a green span with width specified in 'ch' units
+ var b = document.createElement("span");
+ b.className = "b";
+ b.style.width = j + "ch";
+ b.textContent = "\xA0";
+ div.appendChild(b);
+ div.appendChild(document.createElement("br"));
+ }
+}
+</script>
diff --git a/layout/reftests/css-valuesandunits/reftest.list b/layout/reftests/css-valuesandunits/reftest.list
new file mode 100644
index 0000000000..fb313c73c5
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/reftest.list
@@ -0,0 +1,19 @@
+== unit-rem-div-fontsize.html unit-rem-ref.html
+== unit-rem-div-width-inner.html unit-rem-ref.html
+== unit-rem-div-width-outer.html unit-rem-ref.html
+fuzzy-if(webrender&&winWidget,0-27,0-4) == unit-rem-iframe.html unit-rem-ref-iframe.html
+== unit-rem-root-fontsize.html unit-rem-ref-root-fontsize.html
+== unit-rem-root-fontsize.html unit-rem-ref2-root-fontsize.html
+== unit-rem-root-width.html unit-rem-ref-root-width.html
+== unit-rem.svg unit-rem-ref.svg
+== unit-vh-vw.html unit-vh-vw-ref.html
+== unit-vh-vw-zoom.html unit-vh-vw-zoom-ref.html
+fuzzy(0-1,0-4) == unit-vh-vw-overflow-auto.html unit-vh-vw-overflow-auto-ref.html # fuzzy due to anti-aliasing pixels in scrollbar redendering
+
+# These tests should probably be removed, see bug 1393603.
+fails-if(!Android) == unit-vh-vw-overflow-scroll.html unit-vh-vw-overflow-scroll-ref.html
+fails-if(!Android) == unit-vh-vw-overflow-scroll-x.html unit-vh-vw-overflow-scroll-x-ref.html
+fails-if(!Android) == unit-vh-vw-overflow-scroll-y.html unit-vh-vw-overflow-scroll-y-ref.html
+fuzzy-if(gtkWidget,0-1,0-4) fuzzy-if(cocoaWidget,0-1,0-4) == unit-vh-vw-overflow-auto.html unit-vh-vw-overflow-scroll.html
+
+== ch-width-1.html ch-width-1-ref.html
diff --git a/layout/reftests/css-valuesandunits/unit-rem-div-fontsize.html b/layout/reftests/css-valuesandunits/unit-rem-div-fontsize.html
new file mode 100644
index 0000000000..7f6ceedcf9
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-div-fontsize.html
@@ -0,0 +1,13 @@
+<style>
+:root { font-size: 20px }
+body { font-size: 25px }
+div {
+ font-size: 1.5rem;
+ width: 300px;
+}
+#a {
+ border-bottom: 1px solid #f00;
+}
+</style>
+
+<body>Level 1<div id=a>Level 2<div id=b>Level 3</div></div></body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-div-width-inner.html b/layout/reftests/css-valuesandunits/unit-rem-div-width-inner.html
new file mode 100644
index 0000000000..ab0948bd8f
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-div-width-inner.html
@@ -0,0 +1,13 @@
+<style>
+:root { font-size: 20px }
+body { font-size: 25px }
+div {
+ font-size: 30px;
+ width: 15rem;
+}
+#b {
+ border-bottom: 1px solid #f00;
+}
+</style>
+
+<body>Level 1<div id=a>Level 2<div id=b>Level 3</div></div></body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-div-width-outer.html b/layout/reftests/css-valuesandunits/unit-rem-div-width-outer.html
new file mode 100644
index 0000000000..6203e26628
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-div-width-outer.html
@@ -0,0 +1,13 @@
+<style>
+:root { font-size: 20px }
+body { font-size: 25px }
+div {
+ font-size: 30px;
+ width: 15rem;
+}
+#a {
+ border-bottom: 1px solid #f00;
+}
+</style>
+
+<body>Level 1<div id=a>Level 2<div id=b>Level 3</div></div></body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-iframe-inside.html b/layout/reftests/css-valuesandunits/unit-rem-iframe-inside.html
new file mode 100644
index 0000000000..954fcf4e32
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-iframe-inside.html
@@ -0,0 +1,7 @@
+<style>
+:root { font-size: 20px }
+body { font-size: 25px }
+div { font-size: 1.5rem }
+</style>
+
+<body><div>Inside</div></body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-iframe.html b/layout/reftests/css-valuesandunits/unit-rem-iframe.html
new file mode 100644
index 0000000000..a91350a2a1
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-iframe.html
@@ -0,0 +1,6 @@
+<style>
+:root { font-size: 10px }
+body { font-size: 12px }
+</style>
+
+<body>Outside<iframe src=unit-rem-iframe-inside.html></body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-ref-iframe-inside.html b/layout/reftests/css-valuesandunits/unit-rem-ref-iframe-inside.html
new file mode 100644
index 0000000000..57bd094f84
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-ref-iframe-inside.html
@@ -0,0 +1,7 @@
+<style>
+:root { font-size: 20px }
+body { font-size: 25px }
+div { font-size: 30px }
+</style>
+
+<body><div>Inside</div></body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-ref-iframe.html b/layout/reftests/css-valuesandunits/unit-rem-ref-iframe.html
new file mode 100644
index 0000000000..7610ba3b52
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-ref-iframe.html
@@ -0,0 +1,6 @@
+<style>
+:root { font-size: 10px }
+body { font-size: 12px }
+</style>
+
+<body>Outside<iframe src=unit-rem-ref-iframe-inside.html></body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-ref-resource.svg b/layout/reftests/css-valuesandunits/unit-rem-ref-resource.svg
new file mode 100644
index 0000000000..d58accb9d0
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-ref-resource.svg
@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1"
+ style="font-size: 30px">
+ <rect id="rect" fill="green" width="200px" height="50px" />
+</svg>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-ref-root-fontsize.html b/layout/reftests/css-valuesandunits/unit-rem-ref-root-fontsize.html
new file mode 100644
index 0000000000..da2cb1e7b1
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-ref-root-fontsize.html
@@ -0,0 +1,7 @@
+<style>
+:root {
+ font-size: 1.5em;
+}
+</style>
+
+<body>Hello</body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-ref-root-width.html b/layout/reftests/css-valuesandunits/unit-rem-ref-root-width.html
new file mode 100644
index 0000000000..3cf785e587
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-ref-root-width.html
@@ -0,0 +1,12 @@
+<style>
+:root {
+ font-size: 30px;
+ width: 300px;
+ border-bottom: 1px solid #f00;
+}
+body {
+ font-size: 25px;
+}
+</style>
+
+<body>Level 1</body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-ref.html b/layout/reftests/css-valuesandunits/unit-rem-ref.html
new file mode 100644
index 0000000000..afcdb91ad6
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-ref.html
@@ -0,0 +1,13 @@
+<style>
+:root { font-size: 20px }
+body { font-size: 25px }
+div {
+ font-size: 30px;
+ width: 300px;
+}
+#a {
+ border-bottom: 1px solid #f00;
+}
+</style>
+
+<body>Level 1<div id=a>Level 2<div id=b>Level 3</div></div></body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-ref.svg b/layout/reftests/css-valuesandunits/unit-rem-ref.svg
new file mode 100644
index 0000000000..18bea032f4
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-ref.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ style="font-size: 20px">
+ <use xlink:href="unit-rem-ref-resource.svg#rect" />
+</svg>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-ref2-root-fontsize.html b/layout/reftests/css-valuesandunits/unit-rem-ref2-root-fontsize.html
new file mode 100644
index 0000000000..600ddcd595
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-ref2-root-fontsize.html
@@ -0,0 +1,7 @@
+<style>
+body {
+ font-size: 1.5em;
+}
+</style>
+
+<body>Hello</body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-resource.svg b/layout/reftests/css-valuesandunits/unit-rem-resource.svg
new file mode 100644
index 0000000000..a7b751deb0
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-resource.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1"
+ style="font-size: 30px">
+ <!-- We don't support 'rem' in the width attribute because that's nsSVGLength
+ code, so we use indirection through 'em' and 'font-size'. -->
+ <rect id="rect" fill="green" style="font-size: 2rem" width="5em" height="50px" />
+</svg>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-root-fontsize.html b/layout/reftests/css-valuesandunits/unit-rem-root-fontsize.html
new file mode 100644
index 0000000000..69f1943221
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-root-fontsize.html
@@ -0,0 +1,7 @@
+<style>
+:root {
+ font-size: 1.5rem;
+}
+</style>
+
+<body>Hello</body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem-root-width.html b/layout/reftests/css-valuesandunits/unit-rem-root-width.html
new file mode 100644
index 0000000000..3e41edadb7
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem-root-width.html
@@ -0,0 +1,12 @@
+<style>
+:root {
+ font-size: 30px;
+ width: 10rem;
+ border-bottom: 1px solid #f00;
+}
+body {
+ font-size: 25px;
+}
+</style>
+
+<body>Level 1</body>
diff --git a/layout/reftests/css-valuesandunits/unit-rem.svg b/layout/reftests/css-valuesandunits/unit-rem.svg
new file mode 100644
index 0000000000..197e80d490
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-rem.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ style="font-size: 20px">
+ <use xlink:href="unit-rem-resource.svg#rect" />
+</svg>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-iframe.html
new file mode 100644
index 0000000000..437873782e
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-iframe.html
@@ -0,0 +1,14 @@
+<style>
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div style="width: 50vw"></div>
+ <div style="height: 25vh"></div>
+ <div style="width: 35vmin"></div>
+ <div style="height: 25vmax"></div>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-iframe.html
new file mode 100644
index 0000000000..203b6efa95
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-iframe.html
@@ -0,0 +1,21 @@
+<style>
+ body { overflow: auto }
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div style="width: 50vw"></div>
+ <div style="height: 25vh"></div>
+ <div style="width: 35vmin"></div>
+ <div style="height: 25vmax"></div>
+
+ <!--
+ Deliberately make the scrollbars appear to ensure that with 'overflow: auto'
+ viewport units are calculated as if the scrollbars are _not_ there.
+ -->
+ <div style="width: 500px; height: 500px; background-color: black">
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-ref-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-ref-iframe.html
new file mode 100644
index 0000000000..2803e712b5
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-ref-iframe.html
@@ -0,0 +1,37 @@
+<style>
+ body { overflow: hidden }
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div id="a"></div>
+ <div id="b"></div>
+ <div id="c"></div>
+ <div id="d"></div>
+
+ <!--
+ Deliberately make the scrollbars appear to ensure that with 'overflow: auto'
+ viewport units are calculated as if the scrollbars are _not_ there.
+ -->
+ <div style="width: 500px; height: 500px; background-color: black">
+</body>
+
+<script>
+ // client{Width, Height} consist of the area _inside_ the scrollbars, so we need
+ // to calculate these units with 'overflow: hidden' set to ensure that there are
+ // no scrollbars. This reflects the fact that with 'overflow: auto' set, viewport
+ // units are sized without taking the scrollbars into account.
+ var vw = 0.01 * document.body.clientWidth;
+ var vh = 0.01 * document.body.clientHeight;
+ var vmin = Math.min(vw, vh);
+ var vmax = Math.max(vw, vh);
+ document.body.style.overflow = "auto";
+ document.getElementById('a').style.width = (50 * vw) + "px";
+ document.getElementById('b').style.height = (25 * vh) + "px";
+ document.getElementById('c').style.width = (35 * vmin) + "px";
+ document.getElementById('d').style.height = (25 * vmax) + "px";
+</script>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-ref.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-ref.html
new file mode 100644
index 0000000000..5bbe4b17c0
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto-ref.html
@@ -0,0 +1,15 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-overflow-auto-ref-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-overflow-auto-ref-iframe.html"></iframe>
+</body>
+
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto.html
new file mode 100644
index 0000000000..1f68c3b1d9
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-auto.html
@@ -0,0 +1,14 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-overflow-auto-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-overflow-auto-iframe.html"></iframe>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-iframe.html
new file mode 100644
index 0000000000..6f9960f6e5
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-iframe.html
@@ -0,0 +1,22 @@
+<style>
+ body { overflow: scroll }
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div style="width: 50vw"></div>
+ <div style="height: 25vh"></div>
+ <div style="width: 35vmin"></div>
+ <div style="height: 25vmax"></div>
+
+ <!--
+ Ensure that the scroller positioned the same way as it would be in the
+ 'overflow: auto' case. We'll have scrollbars either way, but we don't
+ want the '!=' reftest to spuriously succeed because of the scrollers.
+ -->
+ <div style="width: 500px; height: 500px; background-color: black">
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-ref-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-ref-iframe.html
new file mode 100644
index 0000000000..c06fc4476f
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-ref-iframe.html
@@ -0,0 +1,36 @@
+<style>
+ body { overflow: scroll }
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div id="a"></div>
+ <div id="b"></div>
+ <div id="c"></div>
+ <div id="d"></div>
+
+ <!--
+ Ensure that the scroller positioned the same way as it would be in the
+ 'overflow: auto' case. We'll have scrollbars either way, but we don't
+ want the '!=' reftest to spuriously succeed because of the scrollers.
+ -->
+ <div style="width: 500px; height: 500px; background-color: black">
+</body>
+
+<script>
+ // client{Width, Height} consist of the area _inside_ the scrollbars, so these
+ // manually calculated units reflect the fact that with 'overflow: scroll' set,
+ // viewport units are sized taking the scrollbars into account.
+ var vw = 0.01 * document.body.clientWidth;
+ var vh = 0.01 * document.body.clientHeight;
+ var vmin = Math.min(vw, vh);
+ var vmax = Math.max(vw, vh);
+ document.getElementById('a').style.width = (50 * vw) + "px";
+ document.getElementById('b').style.height = (25 * vh) + "px";
+ document.getElementById('c').style.width = (35 * vmin) + "px";
+ document.getElementById('d').style.height = (25 * vmax) + "px";
+</script>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-ref.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-ref.html
new file mode 100644
index 0000000000..f63a89c9b2
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-ref.html
@@ -0,0 +1,14 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-overflow-scroll-ref-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-overflow-scroll-ref-iframe.html"></iframe>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-iframe.html
new file mode 100644
index 0000000000..10c9ff32ec
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-iframe.html
@@ -0,0 +1,18 @@
+<style>
+ body { overflow-x: scroll }
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div style="width: 50vw"></div>
+ <div style="height: 25vh"></div>
+ <div style="width: 35vmin"></div>
+ <div style="height: 25vmax"></div>
+
+ <!-- Deliberately make scrollbars appear. -->
+ <div style="width: 500px; height: 500px; background-color: black">
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-ref-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-ref-iframe.html
new file mode 100644
index 0000000000..a8430fd545
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-ref-iframe.html
@@ -0,0 +1,28 @@
+<style>
+ body { overflow-x: scroll }
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div style="width: 50px"></div> <!-- Unaffected by scrollbars. -->
+ <div id="b"></div>
+ <div style="width: 35px"></div> <!-- Unaffected by scrollbars. -->
+ <div id="d"></div>
+
+ <!-- Deliberately make scrollbars appear. -->
+ <div style="width: 500px; height: 500px; background-color: black">
+</body>
+
+<script>
+ // client{Width, Height} consist of the area _inside_ the scrollbars, so these
+ // manually calculated units reflect the fact that with 'overflow: scroll' set,
+ // viewport units are sized taking the scrollbars into account. Since we're
+ // only dealing with 'overflow-x' here, only the height units are affected.
+ var vh = 0.01 * document.body.clientHeight;
+ document.getElementById('b').style.height = (25 * vh) + "px";
+ document.getElementById('d').style.height = (25 * vh) + "px";
+</script>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-ref.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-ref.html
new file mode 100644
index 0000000000..278ff74ed0
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x-ref.html
@@ -0,0 +1,14 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-overflow-scroll-x-ref-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-overflow-scroll-x-ref-iframe.html"></iframe>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x.html
new file mode 100644
index 0000000000..cde11499e9
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-x.html
@@ -0,0 +1,14 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-overflow-scroll-x-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-overflow-scroll-x-iframe.html"></iframe>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-iframe.html
new file mode 100644
index 0000000000..e6d0fb863a
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-iframe.html
@@ -0,0 +1,18 @@
+<style>
+ body { overflow-y: scroll }
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div style="width: 50vw"></div>
+ <div style="height: 25vh"></div>
+ <div style="width: 35vmin"></div>
+ <div style="height: 25vmax"></div>
+
+ <!-- Deliberately make scrollbars appear. -->
+ <div style="width: 500px; height: 500px; background-color: black">
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-ref-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-ref-iframe.html
new file mode 100644
index 0000000000..7243ccbf7e
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-ref-iframe.html
@@ -0,0 +1,28 @@
+<style>
+ body { overflow-y: scroll }
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div id="a"></div>
+ <div style="height: 50px"></div> <!-- Unaffected by scrollbars. -->
+ <div id="c"></div>
+ <div style="height: 50px"></div> <!-- Unaffected by scrollbars. -->
+
+ <!-- Deliberately make scrollbars appear. -->
+ <div style="width: 500px; height: 500px; background-color: black">
+</body>
+
+<script>
+ // client{Width, Height} consist of the area _inside_ the scrollbars, so these
+ // manually calculated units reflect the fact that with 'overflow: scroll' set,
+ // viewport units are sized taking the scrollbars into account. Since we're
+ // only dealing with 'overflow-y' here, only the width units are affected.
+ var vw = 0.01 * document.body.clientWidth;
+ document.getElementById('a').style.width = (50 * vw) + "px";
+ document.getElementById('c').style.width = (35 * vw) + "px";
+</script>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-ref.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-ref.html
new file mode 100644
index 0000000000..06f0f142c0
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y-ref.html
@@ -0,0 +1,14 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-overflow-scroll-y-ref-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-overflow-scroll-y-ref-iframe.html"></iframe>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y.html
new file mode 100644
index 0000000000..a181551346
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll-y.html
@@ -0,0 +1,14 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-overflow-scroll-y-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-overflow-scroll-y-iframe.html"></iframe>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll.html b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll.html
new file mode 100644
index 0000000000..11696a0389
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-overflow-scroll.html
@@ -0,0 +1,14 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-overflow-scroll-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-overflow-scroll-iframe.html"></iframe>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-ref-iframe.html b/layout/reftests/css-valuesandunits/unit-vh-vw-ref-iframe.html
new file mode 100644
index 0000000000..3694b3f701
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-ref-iframe.html
@@ -0,0 +1,14 @@
+<style>
+ div {
+ width: 10px;
+ height: 10px;
+ background-color: #d64203;
+ }
+</style>
+
+<body>
+ <div style="width: 50px"></div>
+ <div style="height: 50px"></div>
+ <div style="width: 35px"></div>
+ <div style="height: 50px"></div>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-ref.html b/layout/reftests/css-valuesandunits/unit-vh-vw-ref.html
new file mode 100644
index 0000000000..5dc30fd0e4
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-ref.html
@@ -0,0 +1,14 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-ref-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-ref-iframe.html"></iframe>
+</body>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-zoom-ref.html b/layout/reftests/css-valuesandunits/unit-vh-vw-zoom-ref.html
new file mode 100644
index 0000000000..c477c326c3
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-zoom-ref.html
@@ -0,0 +1,18 @@
+<html reftest-zoom="2">
+
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-ref-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-ref-iframe.html"></iframe>
+</body>
+
+</html>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw-zoom.html b/layout/reftests/css-valuesandunits/unit-vh-vw-zoom.html
new file mode 100644
index 0000000000..3272721ae2
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw-zoom.html
@@ -0,0 +1,18 @@
+<html reftest-zoom="2">
+
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-iframe.html"></iframe>
+</body>
+
+</html>
diff --git a/layout/reftests/css-valuesandunits/unit-vh-vw.html b/layout/reftests/css-valuesandunits/unit-vh-vw.html
new file mode 100644
index 0000000000..59aea944c0
--- /dev/null
+++ b/layout/reftests/css-valuesandunits/unit-vh-vw.html
@@ -0,0 +1,14 @@
+<style>
+ body { background-color: black }
+ iframe {
+ width: 100px;
+ height: 200px;
+ margin: 0px;
+ border: 0px;
+ }
+</style>
+
+<body>
+ <iframe src="unit-vh-vw-iframe.html"></iframe>
+ <iframe src="unit-vh-vw-iframe.html"></iframe>
+</body>