Use universal html package to bring in the ImageElement class

lib/widgets/editor.dart

@@ -25,6 +25,7 @@ import 'package:string_validator/string_validator.dart';
 // ignore: import_of_legacy_library_into_null_safe
 import 'package:universal_html/prefer_universal/html.dart' as html;
 import 'package:url_launcher/url_launcher.dart';
+import 'package:universal_html/universal_html.dart';
 
 import 'box.dart';
 import 'controller.dart';
@@ -115,7 +116,7 @@ Widget _defaultEmbedBuilderWeb(BuildContext context, leaf.Embed node) {
       String imageUrl = node.value.data;
       Size size = MediaQuery.of(context).size;
       UniversalUI().platformViewRegistry.registerViewFactory(
-          imageUrl, (int viewId) => html.ImageElement()..src = imageUrl);
+          imageUrl, (int viewId) => ImageElement()..src = imageUrl);
       return Padding(
         padding: EdgeInsets.only(
           right: ResponsiveWidget.isMediumScreen(context)

pubspec.lock

@@ -56,7 +56,7 @@ packages:
       name: csslib
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.16.2"
+    version: "0.17.0"
   fake_async:
     dependency: transitive
     description:
@@ -127,7 +127,7 @@ packages:
       name: html
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.14.0+4"
+    version: "0.15.0"
   http:
     dependency: transitive
     description:
@@ -283,9 +283,11 @@ packages:
   universal_html:
     dependency: "direct main"
     description:
-      name: universal_html
-      url: "https://pub.dartlang.org"
-    source: hosted
+      path: "."
+      ref: "0792f345ad1820770cc45bede8f813002db87802"
+      resolved-ref: "0792f345ad1820770cc45bede8f813002db87802"
+      url: "https://github.com/MillerAdulu/universal_html.git"
+    source: git
     version: "1.2.4"
   universal_io:
     dependency: transitive
@@ -349,7 +351,7 @@ packages:
       name: zone_local
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.2"
+    version: "0.2.0-nullsafety.1"
 sdks:
   dart: ">=2.12.0 <3.0.0"
   flutter: ">=1.24.0-10.2.pre"

pubspec.yaml

@@ -12,6 +12,10 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  universal_html:
+    git:
+      url: "https://github.com/MillerAdulu/universal_html.git"
+      ref: 0792f345ad1820770cc45bede8f813002db87802
   collection: ^1.15.0
   file_picker: ^3.0.0
   flutter_colorpicker: ^0.4.0-nullsafety.0
@@ -20,7 +24,6 @@ dependencies:
   photo_view: ^0.11.1
   string_validator: ^0.2.0-nullsafety.0
   tuple: ^2.0.0
-  universal_html: ^1.2.4
   url_launcher: ^6.0.2
 
 dev_dependencies: