diff --git a/src/dom/attributes.rs b/src/dom/attributes.rs
index 1ddfaff..c1cbe7e 100644
--- a/src/dom/attributes.rs
+++ b/src/dom/attributes.rs
@@ -222,6 +222,52 @@ pub trait AttributeSetter {
                 .expect_throw("Unable to set string attribute");
         }
     }
+
+    fn add_class(&mut self, class_name: &str) {
+        self.ws_element()
+            .class_list()
+            .add_1(class_name)
+            .expect_throw("Unable to add new class");
+    }
+
+    fn remove_class(&mut self, class_name: &str) {
+        self.ws_element()
+            .class_list()
+            .remove_1(class_name)
+            .expect_throw("Unable to remove old class");
+    }
+
+    fn _class(&mut self, class_name: &str) {
+        let (changed, old_value) = self.check_str_attribute_and_return_old_value(class_name);
+        if let Some(old_value) = old_value {
+            self.remove_class(&old_value);
+        }
+        if changed {
+            self.add_class(class_name);
+        }
+    }
+
+    fn _class_if(&mut self, class_name: &str, class_on: bool) {
+        if self.check_bool_attribute(class_on) {
+            if class_on {
+                self.add_class(class_name);
+            } else {
+                self.remove_class(class_name);
+            }
+        }
+    }
+
+    fn _class_or(&mut self, first: bool, first_class: &str, second_class: &str) {
+        if self.check_bool_attribute(first) {
+            if first {
+                self.add_class(first_class);
+                self.remove_class(second_class);
+            } else {
+                self.remove_class(first_class);
+                self.add_class(second_class);
+            }
+        }
+    }
 }
 
 macro_rules! create_methods_for_events {
diff --git a/src/dom/html/attributes.rs b/src/dom/html/attributes.rs
index 0f958e1..6b128ce 100644
--- a/src/dom/html/attributes.rs
+++ b/src/dom/html/attributes.rs
@@ -192,36 +192,18 @@ where
     }
 
     fn class(mut self, class_name: &str) -> Self {
-        let (changed, old_value) = self.check_str_attribute_and_return_old_value(class_name);
-        if let Some(old_value) = old_value {
-            self.ws_element()
-                .class_list()
-                .remove_1(&old_value)
-                .expect_throw("Unable to remove old class");
-        }
-        if changed {
-            self.ws_element()
-                .class_list()
-                .add_1(class_name)
-                .expect_throw("Unable to add new class");
-        }
+        self._class(class_name);
         self
     }
 
     fn class_if(mut self, class_name: &str, class_on: bool) -> Self {
-        if self.check_bool_attribute(class_on) {
-            if class_on {
-                self.ws_element()
-                    .class_list()
-                    .add_1(class_name)
-                    .expect_throw("Unable to add class");
-            } else {
-                self.ws_element()
-                    .class_list()
-                    .remove_1(class_name)
-                    .expect_throw("Unable to remove class");
-            }
-        }
+        self._class_if(class_name, class_on);
+        self
+    }
+
+    /// Set the `first_class` if `first` is true, otherwise, set the `second_class`
+    fn class_or(mut self, first: bool, first_class: &str, second_class: &str) -> Self {
+        self._class_or(first, first_class, second_class);
         self
     }
 
diff --git a/src/dom/svg/attributes.rs b/src/dom/svg/attributes.rs
index 7ecca9d..fb103f0 100644
--- a/src/dom/svg/attributes.rs
+++ b/src/dom/svg/attributes.rs
@@ -1,4 +1,4 @@
-use wasm_bindgen::UnwrapThrowExt;
+//use wasm_bindgen::UnwrapThrowExt;
 
 pub trait SvgAttributeSetter<C>: Sized + crate::dom::attributes::AttributeSetter {
     fn bool_attr(mut self, name: &str, value: bool) -> Self {
@@ -283,41 +283,19 @@ pub trait SvgAttributeSetter<C>: Sized + crate::dom::attributes::AttributeSetter
         str          zoom_and_pan "zoomAndPan"
     }
 
-    // Copied from crate::dom::html::attributes
-    // TODO: Simimilar code should be reuse
     fn class(mut self, class_name: &str) -> Self {
-        let (changed, old_value) = self.check_str_attribute_and_return_old_value(class_name);
-        if let Some(old_value) = old_value {
-            self.ws_element()
-                .class_list()
-                .remove_1(&old_value)
-                .expect_throw("Unable to remove old class");
-        }
-        if changed {
-            self.ws_element()
-                .class_list()
-                .add_1(class_name)
-                .expect_throw("Unable to add new class");
-        }
+        self._class(class_name);
         self
     }
 
-    // Copied from crate::dom::html::attributes
-    // TODO: Simimilar code should be reuse
     fn class_if(mut self, class_name: &str, class_on: bool) -> Self {
-        if self.check_bool_attribute(class_on) {
-            if class_on {
-                self.ws_element()
-                    .class_list()
-                    .add_1(class_name)
-                    .expect_throw("Unable to add class");
-            } else {
-                self.ws_element()
-                    .class_list()
-                    .remove_1(class_name)
-                    .expect_throw("Unable to remove class");
-            }
-        }
+        self._class_if(class_name, class_on);
+        self
+    }
+
+    /// Set the `first_class` if `first` is true, otherwise, set the `second_class`.
+    fn class_or(mut self, first: bool, first_class: &str, second_class: &str) -> Self {
+        self._class_or(first, first_class, second_class);
         self
     }
 }