--- a/layout/style/nsCSSParser.cpp
+++ b/layout/style/nsCSSParser.cpp
@@ -149,16 +149,17 @@ namespace css = mozilla::css;
 #define VARIANT_HCK  (VARIANT_HK | VARIANT_COLOR)
 #define VARIANT_HUK  (VARIANT_HK | VARIANT_URL)
 #define VARIANT_HUO  (VARIANT_INHERIT | VARIANT_URL | VARIANT_NONE)
 #define VARIANT_AHUO (VARIANT_AUTO | VARIANT_HUO)
 #define VARIANT_HPN  (VARIANT_INHERIT | VARIANT_PERCENT | VARIANT_NUMBER)
 #define VARIANT_HN   (VARIANT_INHERIT | VARIANT_NUMBER)
 #define VARIANT_HON  (VARIANT_HN | VARIANT_NONE)
 #define VARIANT_HOS  (VARIANT_INHERIT | VARIANT_NONE | VARIANT_STRING)
+#define VARIANT_LPN  (VARIANT_LP | VARIANT_NUMBER)
 #define VARIANT_TIMING_FUNCTION (VARIANT_KEYWORD | VARIANT_CUBIC_BEZIER)
 #define VARIANT_UK   (VARIANT_URL | VARIANT_KEYWORD)
 #define VARIANT_UO   (VARIANT_URL | VARIANT_NONE)
 #define VARIANT_ANGLE_OR_ZERO (VARIANT_ANGLE | VARIANT_ZERO_ANGLE)
 #define VARIANT_TRANSFORM_LPCALC (VARIANT_LP | VARIANT_CALC | \
                                   VARIANT_CALC_NO_MIN_MAX)
 #define VARIANT_IMAGE (VARIANT_URL | VARIANT_NONE | VARIANT_GRADIENT | \
                        VARIANT_IMAGE_RECT | VARIANT_ELEMENT)
@@ -9029,19 +9030,17 @@ CSSParserImpl::ParseDasharray()
   if (ParseVariant(value, VARIANT_INHERIT | VARIANT_NONE, nsnull)) {
     // 'inherit', 'initial', and 'none' are only allowed on their own
     if (!ExpectEndProperty()) {
       return PR_FALSE;
     }
   } else {
     nsCSSValueList *cur = value.SetListValue();
     for (;;) {
-      if (!ParseVariant(cur->mValue,
-                        VARIANT_LENGTH | VARIANT_PERCENT | VARIANT_NUMBER,
-                        nsnull)) {
+      if (!ParseNonNegativeVariant(cur->mValue, VARIANT_LPN, nsnull)) {
         return PR_FALSE;
       }
       if (CheckEndProperty()) {
         break;
       }
       // skip optional commas between elements
       (void)ExpectSymbol(',', PR_TRUE);
 

--- a/layout/style/test/property_database.js
+++ b/layout/style/test/property_database.js
@@ -2862,17 +2862,17 @@ var gCSSProperties = {
 		invalid_values: []
 	},
 	"stroke-dasharray": {
 		domProp: "strokeDasharray",
 		inherited: true,
 		type: CSS_TYPE_LONGHAND,
 		initial_values: [ "none" ],
 		other_values: [ "5px,3px,2px", "5px 3px 2px", "  5px ,3px	, 2px ", "1px", "5%", "3em" ],
-		invalid_values: []
+		invalid_values: [ "-5px,3px,2px", "5px,3px,-2px" ]
 	},
 	"stroke-dashoffset": {
 		domProp: "strokeDashoffset",
 		inherited: true,
 		type: CSS_TYPE_LONGHAND,
 		initial_values: [ "0", "-0px", "0em" ],
 		other_values: [ "3px", "3%", "1em" ],
 		invalid_values: []