--- a/content/svg/content/test/Makefile.in
+++ b/content/svg/content/test/Makefile.in
@@ -55,16 +55,17 @@ include $(topsrcdir)/config/rules.mk
 		a_href_helper_01.svg \
 		a_href_helper_02_03.svg \
 		a_href_helper_04.svg \
 		test_animLengthObjectIdentity.xhtml \
 		test_animLengthReadonly.xhtml \
 		test_animLengthUnits.xhtml \
 		test_bbox.xhtml \
 		test_bbox-with-invalid-viewBox.xhtml \
+		test_bounds.html \
 		bbox-helper.svg \
 		bounds-helper.svg \
 		test_dataTypes.html \
 		dataTypes-helper.svg \
 		getCTM-helper.svg \
 		test_getCTM.html \
 		test_getSubStringLength.xhtml \
 		getSubStringLength-helper.svg \

--- a/content/svg/content/test/bounds-helper.svg
+++ b/content/svg/content/test/bounds-helper.svg
@@ -2,29 +2,28 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="750"
      xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">
   <style type="text/css">
 text { font: 20px monospace; }
   </style>
 
 <g id="g">
   <text id="text1" x="25" y="25">abc</text>
+  <text id="text1a" x="85" y="25" stroke="black" stroke-width="4">abc</text>
   <rect id="rect1" x="50" y="50" width="50" height="50" fill="green"/>
-  <rect id="rect1a" x="50" y="50" width="50" height="50" fill="none" stroke-width="2" stroke="yellow"/>
+  <rect id="rect1a" x="50" y="50" width="50" height="50" fill="none" stroke-width="4" stroke="yellow"/>
   <text id="text2" x="125" y="25">abc</text>
+  <text id="text2a" x="185" y="25" stroke="black" stroke-width="10">abc</text>
   <g transform="rotate(45 175 75)">
     <rect id="rect2" x="150" y="50" width="50" height="50" fill="yellow"/>
-    <rect id="rect2a" x="150" y="50" width="50" height="50" fill="none" stroke-width="2" stroke="blue"/>
+    <rect id="rect2a" x="150" y="50" width="50" height="50" fill="none" stroke-width="4" stroke="blue"/>
     <text id="text3" x="150" y="50" text-anchor="middle">abc</text>
   </g>
   <g transform="scale(2)">
     <rect id="rect3" x="25" y="80" width="50" height="50" fill="green"/>
-    <rect id="rect3a" x="25" y="80" width="50" height="50" fill="none" stroke-width="2" stroke="blue"/>
+    <rect id="rect3a" x="25" y="80" width="50" height="50" fill="none" stroke-width="4" stroke="blue"/>
   </g>
   <g transform="scale(2) rotate(45 175 75)">
     <rect id="rect4" x="150" y="50" width="50" height="50" fill="yellow"/>
-    <rect id="rect4a" x="150" y="50" width="50" height="50" fill="none" stroke-width="2" stroke="blue"/>
-    <text id="text4" x="125" y="125">abc</text>
+    <rect id="rect4a" x="150" y="50" width="50" height="50" fill="none" stroke-width="4" stroke="blue"/>
   </g>
-  <text id="text1a" x="85" y="25" stroke="black" stroke-width="1">M</text>
-  <text id="text2a" x="185" y="25" stroke="black" stroke-width="10">M</text>
 </g>
 </svg>

--- a/content/svg/content/test/test_bounds.html
+++ b/content/svg/content/test/test_bounds.html
@@ -14,111 +14,130 @@ https://bugzilla.mozilla.org/show_bug.cg
 <div id="content" style="display: none"></div>
 
 <iframe id="svg" src="bounds-helper.svg"></iframe>
 
 <pre id="test">
 <script class="testbody" type="application/javascript">
 SimpleTest.waitForExplicitFinish();
 
+function Rect(left, top, width, height)
+{
+  this.left = left;
+  this.top = top;
+  this.width = width;
+  this.height = height;
+}
+
+Rect.prototype.roundOut = function()
+{
+  this.width = Math.ceil(this.left + this.width) - Math.floor(this.left);
+  this.height = Math.ceil(this.top + this.height) - Math.floor(this.top);
+  this.left = Math.floor(this.left);
+  this.top = Math.floor(this.top);
+}
+
+var delta = 1;
+
+function isApproximately(a, b, message)
+{
+  ok(delta >= Math.abs(a - b), message + " - got " + a + ", expected " + b + " ± " + delta);
+}
+
 function runTest()
 {
-  function isRounded(a, b, message) {
-    is (Math.round(a), Math.round(b), message);
-  }
+  var doc = $("svg").contentWindow.document;
 
-  var doc = $("svg").contentWindow.document;
-  
   var text1 = doc.getElementById("text1");
-  
-  var len = text1.getComputedTextLength();
-  
+
   var text1Bounds = text1.getBoundingClientRect();
   var text2Bounds = doc.getElementById("text2").getBoundingClientRect();
   var text3Bounds = doc.getElementById("text3").getBoundingClientRect();
-  var text4Bounds = doc.getElementById("text4").getBoundingClientRect();
 
   var sin45 = Math.sin(Math.PI / 4);
 
-  isRounded(text1Bounds.left, 25, "text1.getBoundingClientRect().left");
-  isRounded(text1Bounds.width, len, "text1.getBoundingClientRect().width");
+  isApproximately(text1Bounds.left, 24, "text1.getBoundingClientRect().left");
 
-  isRounded(text2Bounds.left, text1Bounds.left + 100, "text2.getBoundingClientRect().left");
-  isRounded(text2Bounds.top, text1Bounds.top, "text2.getBoundingClientRect().top");
-  isRounded(text2Bounds.width, text1Bounds.width, "text2.getBoundingClientRect().width");
-  isRounded(text2Bounds.height, text1Bounds.height, "text2.getBoundingClientRect().height");
+  is(text2Bounds.left, text1Bounds.left + 100, "text2.getBoundingClientRect().left");
+  is(text2Bounds.top, text1Bounds.top, "text2.getBoundingClientRect().top");
+  is(text2Bounds.width, text1Bounds.width, "text2.getBoundingClientRect().width");
+  is(text2Bounds.height, text1Bounds.height, "text2.getBoundingClientRect().height");
 
-  isRounded(text3Bounds.width, (text1Bounds.width + text1Bounds.height) * sin45 + .5, "text3.getBoundingClientRect().width");
-  isRounded(text3Bounds.height, (text1Bounds.height  + text1Bounds.width) * sin45 + .5, "text3.getBoundingClientRect().height");
-
-  isRounded(text4Bounds.width, 2 * (text1Bounds.width + text1Bounds.height) * sin45, "text4.getBoundingClientRect().width");
-  isRounded(text4Bounds.height, 2 * ((text1Bounds.height  + text1Bounds.width) * sin45 - .5), "text4.getBoundingClientRect().height");
+  var r = (text1Bounds.width + text1Bounds.height) * sin45;
+  isApproximately(text3Bounds.width, Math.ceil(r), "text3.getBoundingClientRect().width");
+  isApproximately(text3Bounds.height, Math.ceil(r), "text3.getBoundingClientRect().height");
 
   var rect1Bounds = doc.getElementById("rect1").getBoundingClientRect();
   var rect2Bounds = doc.getElementById("rect2").getBoundingClientRect();
   var rect3Bounds = doc.getElementById("rect3").getBoundingClientRect();
   var rect4Bounds = doc.getElementById("rect4").getBoundingClientRect();
-  
-  isRounded(rect1Bounds.left, 50, "rect1.getBoundingClientRect().left");
-  isRounded(rect1Bounds.top, 50, "rect1.getBoundingClientRect().top");
-  isRounded(rect1Bounds.width, 50, "rect1.getBoundingClientRect().width");
-  isRounded(rect1Bounds.height, 50, "rect1.getBoundingClientRect().height");
+
+  is(rect1Bounds.left, 50, "rect1.getBoundingClientRect().left");
+  is(rect1Bounds.top, 50, "rect1.getBoundingClientRect().top");
+  is(rect1Bounds.width, 50, "rect1.getBoundingClientRect().width");
+  is(rect1Bounds.height, 50, "rect1.getBoundingClientRect().height");
 
-  isRounded(rect2Bounds.left, 175 - 50 * sin45 - .5, "rect2.getBoundingClientRect().left");
-  isRounded(rect2Bounds.top, 75 - 50 * sin45 - .5, "rect2.getBoundingClientRect().top");
-  isRounded(rect2Bounds.width, (50 * sin45 + .5) * 2, "rect2.getBoundingClientRect().width");
-  isRounded(rect2Bounds.height, (50 * sin45 + .5) * 2, "rect2.getBoundingClientRect().height");
+  rect = new Rect(175 - 50 * sin45, 75 - 50 * sin45, 50 * sin45 * 2, 50 * sin45 * 2);
+  rect.roundOut();
+  is(rect2Bounds.left, rect.left, "rect2.getBoundingClientRect().left");
+  is(rect2Bounds.top, rect.top, "rect2.getBoundingClientRect().top");
+  is(rect2Bounds.width, rect.width, "rect2.getBoundingClientRect().width");
+  is(rect2Bounds.height, rect.height, "rect2.getBoundingClientRect().height");
 
-  isRounded(rect3Bounds.left, 50, "rect3.getBoundingClientRect().left");
-  isRounded(rect3Bounds.top, 160, "rect3.getBoundingClientRect().top");
-  isRounded(rect3Bounds.width, 100, "rect3.getBoundingClientRect().width");
-  isRounded(rect3Bounds.height, 100, "rect3.getBoundingClientRect().height");
+  is(rect3Bounds.left, 50, "rect3.getBoundingClientRect().left");
+  is(rect3Bounds.top, 160, "rect3.getBoundingClientRect().top");
+  is(rect3Bounds.width, 100, "rect3.getBoundingClientRect().width");
+  is(rect3Bounds.height, 100, "rect3.getBoundingClientRect().height");
 
-  isRounded(rect4Bounds.left, 350 - 100 * sin45 - .5, "rect4.getBoundingClientRect().left");
-  isRounded(rect4Bounds.top, 150 - 100 * sin45 - .5, "rect4.getBoundingClientRect().top");
-  isRounded(rect4Bounds.width, (100 * sin45 + .5) * 2, "rect4.getBoundingClientRect().width");
-  isRounded(rect4Bounds.height, (100 * sin45 + .5) * 2, "rect4.getBoundingClientRect().height");
+  rect = new Rect(350 - 100 * sin45, 150 - 100 * sin45, 100 * sin45 * 2, 100 * sin45 * 2);
+  rect.roundOut();
+  is(rect4Bounds.left, rect.left, "rect4.getBoundingClientRect().left");
+  is(rect4Bounds.top, rect.top, "rect4.getBoundingClientRect().top");
+  is(rect4Bounds.width, rect.width, "rect4.getBoundingClientRect().width");
+  is(rect4Bounds.height, rect.height, "rect4.getBoundingClientRect().height");
 
   var rect1aBounds = doc.getElementById("rect1a").getBoundingClientRect();
   var rect2aBounds = doc.getElementById("rect2a").getBoundingClientRect();
   var rect3aBounds = doc.getElementById("rect3a").getBoundingClientRect();
   var rect4aBounds = doc.getElementById("rect4a").getBoundingClientRect();
-  
-  isRounded(rect1aBounds.left, 49, "rect1a.getBoundingClientRect().left");
-  isRounded(rect1aBounds.top, 49, "rect1a.getBoundingClientRect().top");
-  isRounded(rect1aBounds.width, 52, "rect1a.getBoundingClientRect().width");
-  isRounded(rect1aBounds.height, 52, "rect1a.getBoundingClientRect().height");
+
+  is(rect1aBounds.left, 48, "rect1a.getBoundingClientRect().left");
+  is(rect1aBounds.top, 48, "rect1a.getBoundingClientRect().top");
+  is(rect1aBounds.width, 54, "rect1a.getBoundingClientRect().width");
+  is(rect1aBounds.height, 54, "rect1a.getBoundingClientRect().height");
 
-  isRounded(rect2aBounds.left, 175 - 52 * sin45 - .5, "rect2a.getBoundingClientRect().left");
-  isRounded(rect2aBounds.top, 75 - 52 * sin45 - .5, "rect2a.getBoundingClientRect().top");
-  isRounded(rect2aBounds.width, 52 * sin45 * 2, "rect2a.getBoundingClientRect().width");
-  isRounded(rect2aBounds.height, 52 * sin45 * 2, "rect2a.getBoundingClientRect().height");
+  rect = new Rect(175 - 54 * sin45, 75 - 54 * sin45, 54 * sin45 * 2, 54 * sin45 * 2);
+  rect.roundOut();
+  is(rect2aBounds.left, rect.left, "rect2a.getBoundingClientRect().left");
+  is(rect2aBounds.top, rect.top, "rect2a.getBoundingClientRect().top");
+  is(rect2aBounds.width, rect.width, "rect2a.getBoundingClientRect().width");
+  is(rect2aBounds.height, rect.height, "rect2a.getBoundingClientRect().height");
 
-  isRounded(rect3aBounds.left, 48, "rect3a.getBoundingClientRect().left");
-  isRounded(rect3aBounds.top, 158, "rect3a.getBoundingClientRect().top");
-  isRounded(rect3aBounds.width, 104, "rect3a.getBoundingClientRect().width");
-  isRounded(rect3aBounds.height, 104, "rect3a.getBoundingClientRect().height");
+  is(rect3aBounds.left, 46, "rect3a.getBoundingClientRect().left");
+  is(rect3aBounds.top, 156, "rect3a.getBoundingClientRect().top");
+  is(rect3aBounds.width, 108, "rect3a.getBoundingClientRect().width");
+  is(rect3aBounds.height, 108, "rect3a.getBoundingClientRect().height");
 
-  isRounded(rect4aBounds.left, 350 - 104 * sin45 - .5, "rect4a.getBoundingClientRect().left");
-  isRounded(rect4aBounds.top, 150 - 104 * sin45 - .5, "rect4a.getBoundingClientRect().top");
-  isRounded(rect4aBounds.width, (104 * sin45 + .5) * 2, "rect4a.getBoundingClientRect().width");
-  isRounded(rect4aBounds.height, (104 * sin45 + .5) * 2, "rect4a.getBoundingClientRect().height");
+  rect = new Rect(350 - 108 * sin45, 150 - 108 * sin45, 108 * sin45 * 2, 108 * sin45 * 2);
+  rect.roundOut();
+  is(rect4aBounds.left, rect.left, "rect4a.getBoundingClientRect().left");
+  is(rect4aBounds.top, rect.top, "rect4a.getBoundingClientRect().top");
+  is(rect4aBounds.width, rect.width, "rect4a.getBoundingClientRect().width");
+  is(rect4aBounds.height, rect.height, "rect4a.getBoundingClientRect().height");
 
   var text1a = doc.getElementById("text1a");
-  
+
   var text1aBounds = text1a.getBoundingClientRect();
   var text2aBounds = doc.getElementById("text2a").getBoundingClientRect();
 
-  var len = text1a.getComputedTextLength();
+  isApproximately(text1aBounds.left, 82, "text1a.getBoundingClientRect().left");
+  is(text1aBounds.width, text1Bounds.width + 4, "text1a.getBoundingClientRect().width");
 
-  isRounded(text1aBounds.left, 85 - 1, "text1a.getBoundingClientRect().left");
-  isRounded(text1aBounds.width, len + 1, "text1a.getBoundingClientRect().width");
-  
-  isRounded(text2aBounds.left, text1aBounds.left + 100 - 4, "text2a.getBoundingClientRect().left");
-  isRounded(text2aBounds.width, text1aBounds.width + 9, "text2a.getBoundingClientRect().width");
+  is(text2aBounds.left, text1aBounds.left + 100 - 3, "text2a.getBoundingClientRect().left");
+  is(text2aBounds.width, text1aBounds.width + 6, "text2a.getBoundingClientRect().width");
 
   SimpleTest.finish();
 }
 
 window.addEventListener("load", runTest, false);
 </script>
 </pre>
 </body>

--- a/layout/svg/base/src/nsSVGUtils.cpp
+++ b/layout/svg/base/src/nsSVGUtils.cpp
@@ -64,32 +64,32 @@
 #include "nsSVGClipPathFrame.h"
 #include "nsSVGMaskFrame.h"
 #include "nsSVGContainerFrame.h"
 #include "nsSVGTextContainerFrame.h"
 #include "nsSVGLength2.h"
 #include "nsGenericElement.h"
 #include "nsSVGGraphicElement.h"
 #include "nsAttrValue.h"
-#include "nsSVGGeometryFrame.h"
 #include "nsIScriptError.h"
 #include "gfxContext.h"
 #include "gfxMatrix.h"
 #include "gfxRect.h"
 #include "gfxImageSurface.h"
 #include "gfxPlatform.h"
 #include "nsSVGForeignObjectFrame.h"
 #include "nsIDOMSVGUnitTypes.h"
 #include "nsSVGEffects.h"
 #include "nsMathUtils.h"
 #include "nsSVGIntegrationUtils.h"
 #include "nsSVGFilterPaintCallback.h"
 #include "nsSVGGeometryFrame.h"
 #include "nsComputedDOMStyle.h"
 #include "nsSVGPathGeometryFrame.h"
+#include "nsSVGPathGeometryElement.h"
 #include "prdtoa.h"
 #include "mozilla/dom/Element.h"
 #include "gfxUtils.h"
 #include "mozilla/Preferences.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
 
@@ -1426,47 +1426,67 @@ nsSVGUtils::WritePPM(const char *fname, 
       fwrite(data + y * stride + 4 * x + GFX_ARGB32_OFFSET_G, 1, 1, f);
       fwrite(data + y * stride + 4 * x + GFX_ARGB32_OFFSET_B, 1, 1, f);
     }
   }
   fclose(f);
 }
 #endif
 
-/*static*/ gfxRect
-nsSVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
-                                          nsSVGGeometryFrame* aFrame)
+// The logic here comes from _cairo_stroke_style_max_distance_from_path
+static gfxRect
+PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
+                              nsSVGGeometryFrame* aFrame,
+                              double styleExpansionFactor)
 {
-  // The logic here comes from _cairo_stroke_style_max_distance_from_path
-
-  double style_expansion = 0.5;
-
-  const nsStyleSVG* style = aFrame->GetStyleSVG();
-
-  if (style->mStrokeLinecap == NS_STYLE_STROKE_LINECAP_SQUARE) {
-    style_expansion = M_SQRT1_2;
-  }
-
-  if (style->mStrokeLinejoin == NS_STYLE_STROKE_LINEJOIN_MITER &&
-      style_expansion < style->mStrokeMiterlimit) {
-    style_expansion = style->mStrokeMiterlimit;
-  }
-
-  style_expansion *= aFrame->GetStrokeWidth();
+  double style_expansion =
+    styleExpansionFactor * aFrame->GetStrokeWidth();
 
   gfxMatrix ctm = aFrame->GetCanvasTM();
 
   double dx = style_expansion * (fabs(ctm.xx) + fabs(ctm.xy));
   double dy = style_expansion * (fabs(ctm.yy) + fabs(ctm.yx));
 
   gfxRect strokeExtents = aPathExtents;
   strokeExtents.Inflate(dx, dy);
   return strokeExtents;
 }
 
+/*static*/ gfxRect
+nsSVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
+                                          nsSVGGeometryFrame* aFrame)
+{
+  return ::PathExtentsToMaxStrokeExtents(aPathExtents, aFrame, 0.5);
+}
+
+/*static*/ gfxRect
+nsSVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
+                                          nsSVGPathGeometryFrame* aFrame)
+{
+  double styleExpansionFactor = 0.5;
+
+  if (static_cast<nsSVGPathGeometryElement*>(aFrame->GetContent())->IsMarkable()) {
+    const nsStyleSVG* style = aFrame->GetStyleSVG();
+
+    if (style->mStrokeLinecap == NS_STYLE_STROKE_LINECAP_SQUARE) {
+      styleExpansionFactor = M_SQRT1_2;
+    }
+
+    if (style->mStrokeLinejoin == NS_STYLE_STROKE_LINEJOIN_MITER &&
+        styleExpansionFactor < style->mStrokeMiterlimit &&
+        aFrame->GetContent()->Tag() != nsGkAtoms::line) {
+      styleExpansionFactor = style->mStrokeMiterlimit;
+    }
+  }
+
+  return ::PathExtentsToMaxStrokeExtents(aPathExtents,
+                                         aFrame,
+                                         styleExpansionFactor);
+}
+
 // ----------------------------------------------------------------------
 
 nsSVGRenderState::nsSVGRenderState(nsRenderingContext *aContext) :
   mRenderMode(NORMAL), mRenderingContext(aContext), mPaintingToWindow(PR_FALSE)
 {
   mGfxContext = aContext->ThebesContext();
 }
 

--- a/layout/svg/base/src/nsSVGUtils.h
+++ b/layout/svg/base/src/nsSVGUtils.h
@@ -71,16 +71,17 @@ class gfxContext;
 class gfxASurface;
 class gfxPattern;
 class gfxImageSurface;
 struct gfxSize;
 struct nsStyleFont;
 class nsSVGEnum;
 class nsISVGChildFrame;
 class nsSVGGeometryFrame;
+class nsSVGPathGeometryFrame;
 class nsSVGDisplayContainerFrame;
 
 namespace mozilla {
 class SVGAnimatedPreserveAspectRatio;
 class SVGPreserveAspectRatio;
 namespace dom {
 class Element;
 } // namespace dom
@@ -559,16 +560,18 @@ public:
    * without doing the calculations for the actual tight extents. We exploit
    * the fact that cairo does have an API for getting the tight device space
    * fill/path extents.
    *
    * This should die once bug 478152 is fixed.
    */
   static gfxRect PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
                                                nsSVGGeometryFrame* aFrame);
+  static gfxRect PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
+                                               nsSVGPathGeometryFrame* aFrame);
 
   /**
    * Convert a floating-point value to a 32-bit integer value, clamping to
    * the range of valid integers.
    */
   static PRInt32 ClampToInt(double aVal)
   {
     return NS_lround(NS_MAX(double(PR_INT32_MIN),