Fix "transform: rotateZ" becoming "transform: rotateY"

Author: NSGolova

src/AngleSharp.Css.Tests/Declarations/CssTransformProperty.cs

@@ -560,6 +560,7 @@ public void CssTransformRotateXLegal()
             Assert.IsFalse(property.IsImportant);
             Assert.IsFalse(property.IsInherited);
             Assert.IsTrue(property.HasValue);
+            Assert.AreEqual(property.Value, "rotateX(10deg)");
         }
 
         [Test]
@@ -571,6 +572,7 @@ public void CssTransformRotateYLegal()
             Assert.IsFalse(property.IsImportant);
             Assert.IsFalse(property.IsInherited);
             Assert.IsTrue(property.HasValue);
+            Assert.AreEqual(property.Value, "rotateY(10deg)");
         }
 
         [Test]
@@ -582,6 +584,7 @@ public void CssTransformRotateZLegal()
             Assert.IsFalse(property.IsImportant);
             Assert.IsFalse(property.IsInherited);
             Assert.IsTrue(property.HasValue);
+            Assert.AreEqual(property.Value, "rotateZ(10deg)");
         }
 
         [Test]

src/AngleSharp.Css/Values/Functions/CssRotateValue.cs

@@ -62,7 +62,7 @@ public String Name
                 }
                 else if (_x is null && _y is null && _z is not null)
                 {
-                    return FunctionNames.RotateY;
+                    return FunctionNames.RotateZ;
                 }
 
                 return FunctionNames.Rotate3d;