SVG doesn't recognize rem units

Source/core/svg/SVGLength.h

Index: Source/core/svg/SVGLength.h
diff --git a/Source/core/svg/SVGLength.h b/Source/core/svg/SVGLength.h
index 50de4436c854b1c5e15b342c41382a6bddbca9f6..3d2fe9e4f412e203f1afc9af25ef1ebc904ca951 100644
--- a/Source/core/svg/SVGLength.h
+++ b/Source/core/svg/SVGLength.h
@@ -55,6 +55,10 @@ public:
     {
         if (m_unitType == LengthTypeNumber)
             return CSSPrimitiveValue::UnitType::CSS_PX;
+
+        if (m_unitType == LengthTypeREMS)
+            return CSSPrimitiveValue::UnitType::CSS_REMS;
+
         return static_cast<CSSPrimitiveValue::UnitType>(m_unitType);
     }
     void setUnitType(SVGLengthType);
@@ -89,7 +93,8 @@ public:
     {
         return unitType == LengthTypePercentage
             || unitType == LengthTypeEMS
-            || unitType == LengthTypeEXS;
+            || unitType == LengthTypeEXS
+            || unitType == LengthTypeREMS;
     }
     inline bool isRelative() const { return isRelativeUnit(unitType()); }