Upgrade from dart:html to pkg:web

Author: Sub6Resources

packages/flutter_html_iframe/lib/iframe_web.dart

@@ -4,8 +4,7 @@ import 'dart:math';
 import 'package:flutter/material.dart';
 import 'package:flutter_html/flutter_html.dart';
 import 'package:flutter_html_iframe/shims/dart_ui.dart' as ui;
-// ignore: avoid_web_libraries_in_flutter
-import 'dart:html' as html;
+import 'package:web/web.dart' show HTMLIFrameElement;
 
 import 'package:webview_flutter/webview_flutter.dart';
 
@@ -25,10 +24,10 @@ class IframeWidget extends StatelessWidget {
         double.tryParse(extensionContext.attributes['width'] ?? "");
     final givenHeight =
         double.tryParse(extensionContext.attributes['height'] ?? "");
-    final html.IFrameElement iframe = html.IFrameElement()
+    final HTMLIFrameElement iframe = HTMLIFrameElement()
       ..width = (givenWidth ?? (givenHeight ?? 150) * 2).toString()
       ..height = (givenHeight ?? (givenWidth ?? 300) / 2).toString()
-      ..src = extensionContext.attributes['src']
+      ..src = extensionContext.attributes['src'] ?? ""
       ..style.border = 'none';
     final String createdViewId = _getRandString(10);
     ui.platformViewRegistry

packages/flutter_html_iframe/pubspec.yaml

@@ -12,6 +12,7 @@ dependencies:
     sdk: flutter
   html: '>=0.15.0 <1.0.0'
   flutter_html: ^3.0.0-beta.2
+  web: '>=1.1.1 < 2.0.0'
   webview_flutter: '>=4.0.0 <5.0.0'
 
 dev_dependencies: