fix rem support

Author: rbri

src/main/java/com/gargoylesoftware/css/dom/CSSValueImpl.java

@@ -68,6 +68,9 @@ public enum CSSPrimitiveValueType {
         /** CSS_EXS. */
         CSS_EXS,
 
+        /** CSS_REM. */
+        CSS_REM,
+
         /** CSS_CH. */
         CSS_CH,
 
@@ -310,7 +313,7 @@ public CSSPrimitiveValueType getPrimitiveType() {
                 case EM:
                     return CSSPrimitiveValueType.CSS_EMS;
                 case REM:
-                    return CSSPrimitiveValueType.CSS_UNKNOWN;
+                    return CSSPrimitiveValueType.CSS_REM;
                 case EX:
                     return CSSPrimitiveValueType.CSS_EXS;
                 case CH:

src/test/java/com/gargoylesoftware/css/dom/CSSValueImplTest.java

@@ -534,7 +534,7 @@ public void rem() throws Exception {
         final CSSValueImpl value = new CSSValueImpl(lu, false);
 
         Assert.assertEquals("1.2rem", value.getCssText());
-        Assert.assertEquals(CSSPrimitiveValueType.CSS_UNKNOWN, value.getPrimitiveType());
+        Assert.assertEquals(CSSPrimitiveValueType.CSS_REM, value.getPrimitiveType());
         Assert.assertEquals(LexicalUnit.LexicalUnitType.REM, value.getLexicalUnitType());
         Assert.assertEquals(1.2, value.getDoubleValue(), 0.00001);
         try {

src/test/java/com/gargoylesoftware/css/parser/CSS3ParserTest.java

@@ -2343,7 +2343,7 @@ public void dimensionEMS() throws Exception {
     @Test
     public void dimensionREM() throws Exception {
         final CSSValueImpl value = dimension("17rem");
-        Assert.assertEquals(CSSPrimitiveValueType.CSS_UNKNOWN, value.getPrimitiveType());
+        Assert.assertEquals(CSSPrimitiveValueType.CSS_REM, value.getPrimitiveType());
     }
 
     /**