[SVG2] Allow leading and trailing whitespace in svg attributes

Source/core/svg/SVGAnimationElement.cpp

Index: Source/core/svg/SVGAnimationElement.cpp
diff --git a/Source/core/svg/SVGAnimationElement.cpp b/Source/core/svg/SVGAnimationElement.cpp
index e920868f82869963ad5f904f1140e6b728d4c0fd..afa3fd325789b7af91d98ea6e015e31c3da776b8 100644
--- a/Source/core/svg/SVGAnimationElement.cpp
+++ b/Source/core/svg/SVGAnimationElement.cpp
@@ -110,7 +110,7 @@ static void parseKeySplinesInternal(const String& string, Vector<UnitBezier>& re
         }
 
         float posD = 0;
-        if (!parseNumber(ptr, end, posD, false)) {
+        if (!parseNumber(ptr, end, posD, STRICT)) {
             result.clear();
             return;
         }