diff --git a/CHANGELOG.md b/CHANGELOG.md
index d069358f..6ec72d1c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 All notable changes to this project will be documented in this file.
 
+## 8.5.4
+- The `mobileWidth`, `mobileHeight`, `mobileMargin` and `mobileAlignment` is now deprecated in `flutter_quill`, they are are now defined in `flutter_quill_extensions`
+
 ## 8.5.3
 - Update doc
 - Update `README.md` and `CHANGELOG.md`
diff --git a/README.md b/README.md
index d5ec3667..4db2dd8c 100644
--- a/README.md
+++ b/README.md
@@ -46,12 +46,13 @@ it in GitHub repo instead.
   - [Usage](#usage)
   - [Migration](#migration)
   - [Input / Output](#input--output)
-  - [Configurations](#configurations)
     - [Links](#links)
+  - [Configurations](#configurations)
+    - [Links](#links-1)
     - [Font Family](#font-family)
   - [Embed Blocks](#embed-blocks)
     - [Using the embed blocks from `flutter_quill_extensions`](#using-the-embed-blocks-from-flutter_quill_extensions)
-    - [Links](#links-1)
+    - [Links](#links-2)
   - [Conversion to HTML](#conversion-to-html)
   - [Translation](#translation)
   - [Testing](#testing)
@@ -143,7 +144,7 @@ QuillProvider(
 
 And depending on your use case, you might want to dispose the `_controller` in dispose method
 
-in most cases it's better to.
+in most cases, it's better to.
 
 Check out [Sample Page] for more advanced usage.
 
@@ -153,7 +154,15 @@ We have added [Migration Guide](/doc/migration.md) for migration from different
 
 ## Input / Output
 
-This library uses [Quill] as an internal data format.
+This library uses [Quill Delta](https://quilljs.com/docs/delta/)
+to represent the document content.
+The Delta format is a compact and versatile way to describe document changes.
+It consists of a series of operations, each representing an insertion, deletion,
+or formatting change within the document.
+
+Don’t be confused by its name Delta—Deltas represents both documents and changes to documents.
+If you think of Deltas as the instructions from going from one document to another,
+the way Deltas represent a document is by expressing the instructions starting from an empty document.
 
 * Use `_controller.document.toDelta()` to extract the deltas.
 * Use `_controller.document.toPlainText()` to extract plain text.
@@ -162,7 +171,7 @@ FlutterQuill provides some JSON serialization support, so that you can save and
 To save a document as JSON, do something like the following:
 
 ```dart
-var json = jsonEncode(_controller.document.toDelta().toJson());
+final json = jsonEncode(_controller.document.toDelta().toJson());
 ```
 
 You can then write this to storage.
@@ -171,13 +180,23 @@ To open a FlutterQuill editor with an existing JSON representation that you've p
 you can do something like this:
 
 ```dart
-var myJSON = jsonDecode(r'{"insert":"hello\n"}');
+final json = jsonDecode(r'{"insert":"hello\n"}');
+
 _controller = QuillController(
-          document: Document.fromJson(myJSON),
-          selection: TextSelection.collapsed(offset: 0),
-        );
+  document: Document.fromJson(json),
+  selection: TextSelection.collapsed(offset: 0),
+);
 ```
 
+### Links
+
+- [Quill Delta](https://quilljs.com/docs/delta/)
+- [Quill Delta Formats](https://quilljs.com/docs/formats)
+- [Why Quill](https://quilljs.com/guides/why-quill/)
+- [Quill JS Configurations](https://quilljs.com/docs/configuration/)
+- [Quill JS Interactive Playground](https://quilljs.com/playground/)
+- [Quill JS GitHub repo](https://github.com/quilljs/quill)
+
 ## Configurations
 
 The `QuillToolbar` and `QuillEditor` widgets lets you customize a lot of things
diff --git a/flutter_quill_extensions/lib/logic/extensions/attribute.dart b/flutter_quill_extensions/lib/logic/extensions/attribute.dart
new file mode 100644
index 00000000..84cdecf6
--- /dev/null
+++ b/flutter_quill_extensions/lib/logic/extensions/attribute.dart
@@ -0,0 +1,14 @@
+import 'package:flutter_quill/flutter_quill.dart'
+    show Attribute, AttributeScope;
+
+class MobileWidthAttribute extends Attribute<String?> {
+  const MobileWidthAttribute(String? val)
+      : super('mobileWidth', AttributeScope.ignore, val);
+}
+
+class MobileHeightAttribute extends Attribute<String?> {
+  const MobileHeightAttribute(String? val)
+      : super('mobileHeight', AttributeScope.ignore, val);
+}
+
+extension AttributeExt on Attribute {}
diff --git a/lib/src/models/documents/attribute.dart b/lib/src/models/documents/attribute.dart
index 03df00fe..b8127881 100644
--- a/lib/src/models/documents/attribute.dart
+++ b/lib/src/models/documents/attribute.dart
@@ -109,20 +109,20 @@ class Attribute<T> extends Equatable {
 
   static final ScriptAttribute script = ScriptAttribute(null);
 
-  // TODO: You might want to mark those as key (like mobileWidthKey)
-  // because it was not very clear to a developer that is new to this project
+  @Deprecated('This property is no logner used in flutter_quill')
   static const String mobileWidth = 'mobileWidth';
 
+  @Deprecated('This property is no logner used in flutter_quill')
   static const String mobileHeight = 'mobileHeight';
 
+  @Deprecated('This property is no logner used in flutter_quill')
   static const String mobileMargin = 'mobileMargin';
 
+  @Deprecated('This property is no logner used in flutter_quill')
   static const String mobileAlignment = 'mobileAlignment';
 
-  /// For other platforms, for mobile use [mobileAlignment]
   static const String alignment = 'alignment';
 
-  /// For other platforms, for mobile use [mobileMargin]
   static const String margin = 'margin';
 
   static const ImageAttribute image = ImageAttribute(null);