diff --git a/src/components/gfx/geometry.rs b/src/components/gfx/geometry.rs
index 6195df0bb6a..0f3b53ae197 100644
--- a/src/components/gfx/geometry.rs
+++ b/src/components/gfx/geometry.rs
@@ -85,8 +85,8 @@ impl Au {
         Au(((*self as float) * factor) as i32)
     }
 
-    pub fn from_px(i: int) -> Au {
-        NumCast::from(i * 60)
+    pub fn from_px(px: int) -> Au {
+        NumCast::from(px * 60)
     }
 
     pub fn to_px(&self) -> int {
@@ -108,12 +108,12 @@ impl Au {
         Rect(Point2D(z, z), Size2D(z, z))
     }
 
-    pub fn from_pt(f: float) -> Au {
-        from_px(pt_to_px(f) as int)
+    pub fn from_pt(pt: float) -> Au {
+        from_px(pt_to_px(pt) as int)
     }
 
-    pub fn from_frac_px(f: float) -> Au {
-        Au((f * 60f) as i32)
+    pub fn from_frac_px(px: float) -> Au {
+        Au((px * 60f) as i32)
     }
 
     pub fn min(x: Au, y: Au) -> Au { if *x < *y { x } else { y } }
@@ -121,13 +121,13 @@ impl Au {
 }
 
 // assumes 72 points per inch, and 96 px per inch
-pub fn pt_to_px(f: float) -> float {
-    f / 72f * 96f
+pub fn pt_to_px(pt: float) -> float {
+    pt / 72f * 96f
 }
 
 // assumes 72 points per inch, and 96 px per inch
-pub fn px_to_pt(f: float) -> float {
-    f / 96f * 72f
+pub fn px_to_pt(px: float) -> float {
+    px / 96f * 72f
 }
 
 pub fn zero_rect() -> Rect<Au> {
@@ -143,12 +143,12 @@ pub fn zero_size() -> Size2D<Au> {
     Size2D(Au(0), Au(0))
 }
 
-pub fn from_frac_px(f: float) -> Au {
-    Au((f * 60f) as i32)
+pub fn from_frac_px(px: float) -> Au {
+    Au((px * 60f) as i32)
 }
 
-pub fn from_px(i: int) -> Au {
-    NumCast::from(i * 60)
+pub fn from_px(px: int) -> Au {
+    NumCast::from(px * 60)
 }
 
 pub fn to_px(au: Au) -> int {
@@ -160,6 +160,6 @@ pub fn to_frac_px(au: Au) -> float {
 }
 
 // assumes 72 points per inch, and 96 px per inch
-pub fn from_pt(f: float) -> Au {
-    from_px((f / 72f * 96f) as int)
+pub fn from_pt(pt: float) -> Au {
+    from_px((pt / 72f * 96f) as int)
 }
diff --git a/src/components/main/layout/box.rs b/src/components/main/layout/box.rs
index bee12968afd..fbe4c3dae44 100644
--- a/src/components/main/layout/box.rs
+++ b/src/components/main/layout/box.rs
@@ -22,11 +22,12 @@ use gfx::display_list::{DisplayList, ImageDisplayItem, ImageDisplayItemClass};
 use gfx::display_list::{SolidColorDisplayItem, SolidColorDisplayItemClass, TextDisplayItem};
 use gfx::display_list::{TextDisplayItemClass};
 use gfx::font::{FontStyle, FontWeight300};
-use gfx::geometry::{Au, pt_to_px};
+use gfx::geometry::Au;
 use gfx::text::text_run::TextRun;
 use newcss::color::rgb;
 use newcss::complete::CompleteStyle;
-use newcss::units::{Cursive, Em, Fantasy, Monospace, Pt, Px, SansSerif, Serif};
+use newcss::units::{Em, Px};
+use newcss::units::{Cursive, Fantasy, Monospace, SansSerif, Serif};
 use newcss::values::{CSSClearNone, CSSClearLeft, CSSClearRight, CSSClearBoth};
 use newcss::values::{CSSFontFamilyFamilyName, CSSFontFamilyGenericFamily};
 use newcss::values::{CSSFontSizeLength, CSSFontStyleItalic, CSSFontStyleNormal};
@@ -790,7 +791,6 @@ impl RenderBox {
 
         let font_size = match my_style.font_size() {
             CSSFontSizeLength(Px(length)) => length,
-            CSSFontSizeLength(Pt(length)) => pt_to_px(length),
             // todo: this is based on a hard coded font size, should be the parent element's font size
             CSSFontSizeLength(Em(length)) => length * 16f, 
             _ => 16f // px units
diff --git a/src/components/main/layout/inline.rs b/src/components/main/layout/inline.rs
index d1a9c5e9708..c39dfbeb2e3 100644
--- a/src/components/main/layout/inline.rs
+++ b/src/components/main/layout/inline.rs
@@ -18,7 +18,7 @@ use geom::{Point2D, Rect, Size2D};
 use gfx::display_list::DisplayList;
 use gfx::geometry::Au;
 use newcss::values::{CSSTextAlignLeft, CSSTextAlignCenter, CSSTextAlignRight, CSSTextAlignJustify};
-use newcss::units::{Em, Px, Pt};
+use newcss::units::{Em, Px};
 use newcss::values::{CSSLineHeightNormal, CSSLineHeightNumber, CSSLineHeightLength, CSSLineHeightPercentage};
 use servo_util::range::Range;
 use servo_util::tree::TreeNodeRef;
@@ -194,7 +194,6 @@ impl LineboxScanner {
                     CSSLineHeightNumber(l) => em_size.scale_by(l),
                     CSSLineHeightLength(Em(l)) => em_size.scale_by(l),
                     CSSLineHeightLength(Px(l)) => Au::from_frac_px(l),
-                    CSSLineHeightLength(Pt(l)) => Au::from_pt(l),
                     CSSLineHeightPercentage(p) => em_size.scale_by(p / 100.0f)
                 };
 
@@ -690,7 +689,6 @@ impl InlineFlowData {
                             CSSLineHeightNumber(l) => em_size.scale_by(l),
                             CSSLineHeightLength(Em(l)) => em_size.scale_by(l),
                             CSSLineHeightLength(Px(l)) => Au::from_frac_px(l),
-                            CSSLineHeightLength(Pt(l)) => Au::from_pt(l),
                             CSSLineHeightPercentage(p) => em_size.scale_by(p / 100.0f)
                         };
 
diff --git a/src/components/main/layout/model.rs b/src/components/main/layout/model.rs
index f3c2a4ef85d..85dc609d2bc 100644
--- a/src/components/main/layout/model.rs
+++ b/src/components/main/layout/model.rs
@@ -8,7 +8,7 @@ use std::num::Zero;
 use geom::side_offsets::SideOffsets2D;
 use gfx::geometry::Au;
 use newcss::complete::CompleteStyle;
-use newcss::units::{Length, Em, Pt, Px};
+use newcss::units::{Length, Em, Px};
 use newcss::values::{CSSBorderWidth, CSSBorderWidthLength, CSSBorderWidthMedium};
 use newcss::values::{CSSBorderWidthThick, CSSBorderWidthThin, CSSFontSize, CSSFontSizeLength};
 use newcss::values::{CSSWidth, CSSWidthLength, CSSWidthPercentage, CSSWidthAuto};
@@ -27,11 +27,9 @@ pub struct BoxModel {
 fn from_length(length: Length, font_size: CSSFontSize) -> Au {
     match length {
         Px(v) => Au::from_frac_px(v),
-        Pt(v) => Au::from_pt(v),
         Em(em) => {
             match font_size {
                 CSSFontSizeLength(Px(v)) => Au::from_frac_px(em * v),
-                CSSFontSizeLength(Pt(v)) => Au::from_pt(em * v),
                 _ => fail!("expected non-relative font size")
             }
         }
diff --git a/src/support/css/rust-css b/src/support/css/rust-css
index 9ed02f7f0c4..d6bec7942ab 160000
--- a/src/support/css/rust-css
+++ b/src/support/css/rust-css
@@ -1 +1 @@
-Subproject commit 9ed02f7f0c4b704adb3ae60426bbc1b124e1a995
+Subproject commit d6bec7942ab07857dd65569dacc1a704dc3514df
diff --git a/src/support/netsurfcss/rust-netsurfcss b/src/support/netsurfcss/rust-netsurfcss
index be68b403279..a55ab9e2834 160000
--- a/src/support/netsurfcss/rust-netsurfcss
+++ b/src/support/netsurfcss/rust-netsurfcss
@@ -1 +1 @@
-Subproject commit be68b4032793167f714deebaf438e89301db9871
+Subproject commit a55ab9e2834b1cc898e68a02795ab68861f95f73
diff --git a/src/test/html/test_cssunit_length.html b/src/test/html/test_cssunit_length.html
new file mode 100644
index 00000000000..8ae817c0b93
--- /dev/null
+++ b/src/test/html/test_cssunit_length.html
@@ -0,0 +1,57 @@
+<html>
+<head>
+<style type="text/css">
+html {
+    background: white;
+    color: black;
+}
+#test_em {
+    border:1em solid;
+    border-color:green;
+    background-color:red;
+}
+#test_pt {
+    border:1pt solid;
+    border-color:green;
+    background-color:red;
+}
+#test_px {
+    border:1px solid;
+    border-color:pink;
+    background-color:green;
+}
+#test_mm {
+    border:1mm solid;
+    border-color:red;
+    background-color:gray;
+}
+#test_pc {
+    border:1pc solid;
+    border-color:yellow;
+    background-color:gray;
+}
+#test_cm {
+    border:1cm solid;
+    border-color:pink;
+    background-color:gray;
+}
+#test_in {
+    border:1in solid;
+    border-color:red;
+    background-color:gray;
+}
+</style>
+</head>
+<body>
+
+<div id="test_em"> Hello, 1em </div>
+<div id="test_pt"> Hello, 1pt </div>
+<div id="test_px"> Hello, 1px </div>
+<div id="test_mm"> Hello, 1mm </div>
+<div id="test_pc"> Hello, 1pc </div>
+<div id="test_cm"> Hello, 1cm </div>
+<div id="test_in"> Hello, 1in </div>
+
+</body>
+</html>
+