diff --git a/lib/phlex_ui/attribute_merger.rb b/lib/phlex_ui/attribute_merger.rb
index 378fd374f..2e4be008c 100644
--- a/lib/phlex_ui/attribute_merger.rb
+++ b/lib/phlex_ui/attribute_merger.rb
@@ -1,6 +1,7 @@
 module PhlexUI
   class AttributeMerger
     attr_reader :default_attrs, :user_attrs
+    OVERRIDE_KEY = "!".freeze
 
     def initialize(default_attrs, user_attrs)
       @default_attrs = flatten_hash(default_attrs)
@@ -12,8 +13,8 @@ def initialize(default_attrs, user_attrs)
     # ex: if default_attrs = { class: "text-right" }, user_attrs = { class!: "text-left" }
     # the result will be { class: "text-left }
     def call
-      merged_attrs = merge_hashes(default_attrs, user_attrs)
-      mix(merged_attrs, user_attrs)
+      merged_attrs = merge_hashes(default_attrs, non_override_attrs)
+      mix(merged_attrs, override_attrs)
     end
 
     private
@@ -28,7 +29,8 @@ def mix(*args)
           when Array
             old.is_a?(Array) ? (old + new) : new
           when String
-            old.is_a?(String) ? "#{old} #{new}" : new
+            value = "#{old} #{new}".split.uniq.join(" ")
+            old.is_a?(String) ? value : new
           else
             new
           end
@@ -40,6 +42,18 @@ def mix(*args)
       end
     end
 
+    def override_attrs
+      user_attrs.select do |key, value|
+        key.to_s[-1] == OVERRIDE_KEY
+      end
+    end
+
+    def non_override_attrs
+      user_attrs.reject do |key, value|
+        key.to_s[-1] == OVERRIDE_KEY
+      end
+    end
+
     def flatten_hash(hash, parent_key = "", result_hash = {})
       hash.each do |key, value|
         new_key = parent_key.empty? ? key : :"#{parent_key}_#{key}"
diff --git a/lib/phlex_ui/base.rb b/lib/phlex_ui/base.rb
index be1db559a..ac6d3c922 100644
--- a/lib/phlex_ui/base.rb
+++ b/lib/phlex_ui/base.rb
@@ -4,11 +4,13 @@
 
 module PhlexUI
   class Base < Phlex::HTML
+    TAILWIND_MERGER = TailwindMerge::Merger.new.freeze
+    
     attr_reader :attrs
 
     def initialize(**user_attrs)
       @attrs = PhlexUI::AttributeMerger.new(default_attrs, user_attrs).call
-      @attrs[:class] = ::TailwindMerge::Merger.new.merge(@attrs[:class]) if @attrs[:class]
+      @attrs[:class] = TAILWIND_MERGER.merge(@attrs[:class]) if @attrs[:class]
     end
 
     if defined?(Rails) && Rails.env.development?
diff --git a/test/phlex_ui/input_test.rb b/test/phlex_ui/input_test.rb
index cc64868a8..4c91de62e 100644
--- a/test/phlex_ui/input_test.rb
+++ b/test/phlex_ui/input_test.rb
@@ -10,7 +10,7 @@ def test_render_with_all_items
       PhlexUI.Input(type: "email", placeholder: "Email")
     end
 
-    assert_match(/Email/, output)
+    assert_match(/placeholder="Email"/, output)
   end
 
   def test_no_destructive_classes_when_error_absent
diff --git a/test/phlex_ui/select_test.rb b/test/phlex_ui/select_test.rb
index 1c31cac38..6f7617df9 100644
--- a/test/phlex_ui/select_test.rb
+++ b/test/phlex_ui/select_test.rb
@@ -14,7 +14,7 @@ def test_render_with_all_items
 
     output = phlex_context do
       PhlexUI.Select do
-        PhlexUI.SelectInput
+        PhlexUI.SelectInput(name: "NAME")
         PhlexUI.SelectTrigger do
           PhlexUI.SelectValue(placeholder: "Placeholder")
         end
@@ -29,5 +29,6 @@ def test_render_with_all_items
     end
 
     assert_match(/John/, output)
+    assert_match('name="NAME"', output)
   end
 end