Add data-src attribute support for IFRAME elements

Co-authored-by: daohoangson <[email protected]>

Author: Copilot

packages/fwfh_webview/lib/src/internal.dart

@@ -1,4 +1,5 @@
 const kTagIframe = 'iframe';
+const kAttributeIframeDataSrc = 'data-src';
 const kAttributeIframeHeight = 'height';
 const kAttributeIframeSandbox = 'sandbox';
 const kAttributeIframeSandboxAllowScripts = 'allow-scripts';

packages/fwfh_webview/lib/src/web_view_factory.dart

@@ -132,7 +132,7 @@ mixin WebViewFactory on WidgetFactory {
               }
 
               final a = meta.element.attributes;
-              final src = urlFull(a[kAttributeIframeSrc] ?? '');
+              final src = urlFull(a[kAttributeIframeDataSrc] ?? a[kAttributeIframeSrc] ?? '');
               if (src == null) {
                 return widgets;
               }

packages/fwfh_webview/test/web_view_factory_test.dart

@@ -318,6 +318,61 @@ void main() {
     });
   });
 
+  group('data-src attribute', () {
+    testWidgets('renders with data-src', (tester) async {
+      const html = '<iframe data-src="$src"></iframe>';
+      final explained = await explain(tester, html);
+      expect(
+        explained,
+        equals(
+          '[CssSizing:$sizingConstraints,child='
+          '[WebView:url=$src,aspectRatio=$defaultAspectRatio,js=true,gestureRecognizers={}]'
+          ']',
+        ),
+      );
+    });
+
+    testWidgets('data-src takes priority over src', (tester) async {
+      const dataSrcUrl = 'http://data-src.com';
+      const html = '<iframe data-src="$dataSrcUrl" src="$src"></iframe>';
+      final explained = await explain(tester, html);
+      expect(
+        explained,
+        equals(
+          '[CssSizing:$sizingConstraints,child='
+          '[WebView:url=$dataSrcUrl,aspectRatio=$defaultAspectRatio,js=true,gestureRecognizers={}]'
+          ']',
+        ),
+      );
+    });
+
+    testWidgets('falls back to src when data-src is empty', (tester) async {
+      const html = '<iframe data-src="" src="$src"></iframe>';
+      final explained = await explain(tester, html);
+      expect(
+        explained,
+        equals(
+          '[CssSizing:$sizingConstraints,child='
+          '[WebView:url=$src,aspectRatio=$defaultAspectRatio,js=true,gestureRecognizers={}]'
+          ']',
+        ),
+      );
+    });
+
+    testWidgets('falls back to src when data-src is missing', (tester) async {
+      const html = '<iframe src="$src"></iframe>';
+      final explained = await explain(tester, html);
+      expect(
+        explained,
+        equals(
+          '[CssSizing:$sizingConstraints,child='
+          '[WebView:url=$src,aspectRatio=$defaultAspectRatio,js=true,gestureRecognizers={}]'
+          ']',
+        ),
+      );
+    });
+  });
+
   group('errors', () {
     testWidgets('no src', (tester) async {
       const html = '<iframe></iframe>';
@@ -330,6 +385,12 @@ void main() {
       final explained = await explain(tester, html);
       expect(explained, equals('[widget0]'));
     });
+
+    testWidgets('bad data-src (cannot build full url)', (tester) async {
+      const html = '<iframe data-src="bad"></iframe>';
+      final explained = await explain(tester, html);
+      expect(explained, equals('[widget0]'));
+    });
   });
 }