diff --git a/lib/src/package_analyzer.dart b/lib/src/package_analyzer.dart
index 90c0b7738..99bd00cb2 100644
--- a/lib/src/package_analyzer.dart
+++ b/lib/src/package_analyzer.dart
@@ -175,6 +175,7 @@ class PackageAnalyzer {
         tagger.runtimeTags(tags_, explanations);
         tagger.flutterPluginTags(tags_, explanations);
         tagger.nullSafetyTags(tags_, explanations);
+        tagger.wasmReadyTag(tags_, explanations);
         // tags are exposed, explanations are ignored
         // TODO: use a single result object to derive tags + report
         tags.addAll(tags_);
diff --git a/lib/src/report/multi_platform.dart b/lib/src/report/multi_platform.dart
index 3cc1d5d4a..78e612cbd 100644
--- a/lib/src/report/multi_platform.dart
+++ b/lib/src/report/multi_platform.dart
@@ -37,6 +37,7 @@ Future<ReportSection> multiPlatform(String packageDir, Pubspec pubspec) async {
 
     Subsection scorePlatforms(
         List<String> tags, List<Explanation> explanations) {
+      // Scoring and the report only takes these platforms into account.
       final tagNames = const {
         PanaTags.platformIos: 'iOS',
         PanaTags.platformAndroid: 'Android',
@@ -45,12 +46,13 @@ Future<ReportSection> multiPlatform(String packageDir, Pubspec pubspec) async {
         PanaTags.platformMacos: 'macOS',
         PanaTags.platformLinux: 'Linux',
       };
+      final officialTags = tags.where(tagNames.containsKey).toList();
       final sdkExplanations =
           explanations.where((e) => e.tag != null && e.tag!.startsWith('sdk:'));
       final platformExplanations = explanations
           .where((e) => e.tag == null || !e.tag!.startsWith('sdk:'));
       final officialExplanations = platformExplanations.where((e) =>
-          !tags.contains(e.tag) &&
+          !officialTags.contains(e.tag) &&
           (e.tag == null || tagNames.containsKey(e.tag)));
       final trustExplanations = explanations.where((e) => tags.contains(e.tag));
       final paragraphs = <Paragraph>[
@@ -59,7 +61,7 @@ Future<ReportSection> multiPlatform(String packageDir, Pubspec pubspec) async {
         if (sdkExplanations.isNotEmpty)
           // This empty line is required for `package:markdown` to render the following list correctly.
           RawParagraph(''),
-        for (final tag in tags.where((e) => e.startsWith('platform')))
+        for (final tag in officialTags.where((e) => e.startsWith('platform')))
           RawParagraph('* ✓ ${tagNames[tag]}'),
         if (officialExplanations.isNotEmpty)
           RawParagraph('\nThese platforms are not supported:\n'),
@@ -70,8 +72,6 @@ Future<ReportSection> multiPlatform(String packageDir, Pubspec pubspec) async {
         ...trustExplanations.map(explanationToIssue),
       ];
 
-      final officialTags = tags.where(tagNames.containsKey).toList();
-
       final status =
           officialTags.where((tag) => tag.startsWith('platform:')).isEmpty
               ? ReportStatus.failed
diff --git a/lib/src/tag/_specs.dart b/lib/src/tag/_specs.dart
index 9ddf2a20b..d30bb9d93 100644
--- a/lib/src/tag/_specs.dart
+++ b/lib/src/tag/_specs.dart
@@ -90,6 +90,12 @@ class Runtime {
     tag: PanaTags.runtimeWeb,
   );
 
+  static final wasm = Runtime(
+    'wasm',
+    {..._onAllPlatforms, 'ui', 'ui_web', 'js_interop', 'js_interop_unsafe'},
+    tag: PanaTags.isWasmReady,
+  );
+
   static final flutterNative = Runtime(
     'flutter-native',
     {
diff --git a/lib/src/tag/pana_tags.dart b/lib/src/tag/pana_tags.dart
index 21f23891e..79357e371 100644
--- a/lib/src/tag/pana_tags.dart
+++ b/lib/src/tag/pana_tags.dart
@@ -17,6 +17,7 @@ abstract class PanaTags {
   static const runtimeFlutterNative = 'runtime:flutter-native';
   static const runtimeFlutterWeb = 'runtime:flutter-web';
   static const runtimeWeb = 'runtime:web';
+  static const isWasmReady = 'is:wasm-ready';
 
   // platform tags
   static const platformAndroid = 'platform:android';
diff --git a/lib/src/tag/tagger.dart b/lib/src/tag/tagger.dart
index 2b66e9b04..3366cd6ae 100644
--- a/lib/src/tag/tagger.dart
+++ b/lib/src/tag/tagger.dart
@@ -335,6 +335,30 @@ class Tagger {
     }
   }
 
+  /// Adds the is:wasm-ready tag if there are no uses of disallowed dart: libraries.
+  void wasmReadyTag(List<String> tags, List<Explanation> explanations) {
+    final runtime = Runtime.wasm;
+    final finder = runtimeViolationFinder(
+        LibraryGraph(_session, runtime.declaredVariables),
+        runtime,
+        (List<Uri> path) => Explanation(
+            'Package not compatible with runtime ${runtime.name}',
+            'Because:\n${LibraryGraph.formatPath(path)}',
+            tag: runtime.tag));
+    var supports = true;
+    for (final lib in _topLibraries) {
+      final violationResult = finder.findViolation(lib);
+      if (violationResult != null) {
+        explanations.add(violationResult);
+        supports = false;
+        break;
+      }
+    }
+    if (supports) {
+      tags.add(runtime.tag);
+    }
+  }
+
   /// Adds tags for the Dart runtimes that this package supports to [tags].
   ///
   /// Adds [Explanation]s to [explanations] for runtimes not supported.
diff --git a/test/goldens/end2end/async-2.11.0.json b/test/goldens/end2end/async-2.11.0.json
index c7ab7a041..560e1a8a2 100644
--- a/test/goldens/end2end/async-2.11.0.json
+++ b/test/goldens/end2end/async-2.11.0.json
@@ -57,6 +57,7 @@
     "runtime:native-jit",
     "runtime:web",
     "is:null-safe",
+    "is:wasm-ready",
     "is:dart3-compatible",
     "license:bsd-3-clause",
     "license:fsf-libre",
diff --git a/test/goldens/end2end/http-0.13.0.json b/test/goldens/end2end/http-0.13.0.json
index 5667003d0..fe93d58b3 100644
--- a/test/goldens/end2end/http-0.13.0.json
+++ b/test/goldens/end2end/http-0.13.0.json
@@ -62,6 +62,7 @@
     "runtime:native-jit",
     "runtime:web",
     "is:null-safe",
+    "is:wasm-ready",
     "is:dart3-compatible",
     "license:bsd-3-clause",
     "license:fsf-libre",
diff --git a/test/goldens/end2end/lints-1.0.0.json b/test/goldens/end2end/lints-1.0.0.json
index 89f0dec80..6a8ae3459 100644
--- a/test/goldens/end2end/lints-1.0.0.json
+++ b/test/goldens/end2end/lints-1.0.0.json
@@ -39,6 +39,7 @@
     "runtime:native-jit",
     "runtime:web",
     "is:null-safe",
+    "is:wasm-ready",
     "is:dart3-compatible",
     "license:bsd-3-clause",
     "license:fsf-libre",
diff --git a/test/goldens/end2end/nsd_android-1.2.2.json b/test/goldens/end2end/nsd_android-1.2.2.json
index 493d73db3..687b42ec5 100644
--- a/test/goldens/end2end/nsd_android-1.2.2.json
+++ b/test/goldens/end2end/nsd_android-1.2.2.json
@@ -58,6 +58,7 @@
     "platform:android",
     "is:plugin",
     "is:null-safe",
+    "is:wasm-ready",
     "is:dart3-compatible",
     "license:mit",
     "license:fsf-libre",
diff --git a/test/goldens/end2end/onepub-1.1.0.json b/test/goldens/end2end/onepub-1.1.0.json
index e4fa0ad1d..64fccf781 100644
--- a/test/goldens/end2end/onepub-1.1.0.json
+++ b/test/goldens/end2end/onepub-1.1.0.json
@@ -111,6 +111,7 @@
     "runtime:native-aot",
     "runtime:native-jit",
     "is:null-safe",
+    "is:wasm-ready",
     "is:dart3-compatible",
     "license:unknown"
   ],
diff --git a/test/goldens/end2end/url_launcher-6.1.12.json b/test/goldens/end2end/url_launcher-6.1.12.json
index 09ba911f8..bac6b8ef5 100644
--- a/test/goldens/end2end/url_launcher-6.1.12.json
+++ b/test/goldens/end2end/url_launcher-6.1.12.json
@@ -104,6 +104,7 @@
     "platform:web",
     "is:plugin",
     "is:null-safe",
+    "is:wasm-ready",
     "is:dart3-compatible",
     "license:bsd-3-clause",
     "license:fsf-libre",
diff --git a/test/tag/tag_end2end_test.dart b/test/tag/tag_end2end_test.dart
index 16e1a3de2..4ceb5c1e8 100644
--- a/test/tag/tag_end2end_test.dart
+++ b/test/tag/tag_end2end_test.dart
@@ -310,8 +310,11 @@ int fourtyTwo() => 42;
       _expectTagging(tagger.sdkTags, tags: {'sdk:flutter', 'sdk:dart'});
       _expectTagging(tagger.platformTags,
           tags: {'platform:windows', 'platform:android'});
-      _expectTagging(tagger.runtimeTags,
-          tags: ['runtime:native-aot', 'runtime:native-jit', 'runtime:web']);
+      _expectTagging(tagger.runtimeTags, tags: [
+        'runtime:native-aot',
+        'runtime:native-jit',
+        'runtime:web',
+      ]);
       _expectTagging(tagger.flutterPluginTags, tags: isEmpty);
     });
 
@@ -406,7 +409,7 @@ Because:
             finding: 'Package not compatible with runtime js', explanation: '''
 Because:
 * `package:my_package/my_package.dart` that imports:
-* `dart:io`''')
+* `dart:io`'''),
       });
       _expectTagging(tagger.flutterPluginTags, tags: isEmpty);
     });
@@ -449,7 +452,11 @@ int fourtyThree() => 43;
           },
           explanations: isEmpty);
       _expectTagging(tagger.runtimeTags,
-          tags: {'runtime:native-aot', 'runtime:native-jit', 'runtime:web'},
+          tags: {
+            'runtime:native-aot',
+            'runtime:native-jit',
+            'runtime:web',
+          },
           explanations: isEmpty);
       _expectTagging(tagger.flutterPluginTags, tags: isEmpty);
     });
@@ -570,6 +577,71 @@ name: my_package
       _expectTagging(tagger.flutterPluginTags, tags: {'is:plugin'});
     });
   });
+
+  group('wasm tag', () {
+    test('Excluded with dart:js', () async {
+      final descriptor = d.dir('cache', [
+        packageWithPathDeps('my_package', lib: [
+          d.file('my_package.dart', '''
+import 'dart:js';
+'''),
+        ])
+      ]);
+
+      await descriptor.create();
+      final tagger = Tagger('${descriptor.io.path}/my_package');
+      _expectTagging(tagger.wasmReadyTag,
+          tags: isNot(contains('is:wasm-ready')));
+    });
+
+    test('Excluded with dart:js_util', () async {
+      final descriptor = d.dir('cache', [
+        packageWithPathDeps('my_package', lib: [
+          d.file('my_package.dart', '''
+import 'dart:js_util';
+'''),
+        ])
+      ]);
+
+      await descriptor.create();
+      final tagger = Tagger('${descriptor.io.path}/my_package');
+      _expectTagging(tagger.wasmReadyTag,
+          tags: isNot(contains('is:wasm-ready')));
+    });
+    test('Excluded with dart:html', () async {
+      final descriptor = d.dir('cache', [
+        packageWithPathDeps('my_package', lib: [
+          d.file('my_package.dart', '''
+import 'dart:html';
+'''),
+        ])
+      ]);
+
+      await descriptor.create();
+      final tagger = Tagger('${descriptor.io.path}/my_package');
+      _expectTagging(tagger.wasmReadyTag,
+          tags: isNot(contains('is:wasm-ready')));
+    });
+
+    test(
+        'Included with dart:ui, dart:ui_web dart:js_interop dart:js_interop_unsafe',
+        () async {
+      final descriptor = d.dir('cache', [
+        packageWithPathDeps('my_package', lib: [
+          d.file('my_package.dart', '''
+import 'dart:ui';
+import 'dart:ui_web';
+import 'dart:js_interop';
+import 'dart:js_interop_unsafe';
+'''),
+        ])
+      ]);
+
+      await descriptor.create();
+      final tagger = Tagger('${descriptor.io.path}/my_package');
+      _expectTagging(tagger.wasmReadyTag, tags: contains('is:wasm-ready'));
+    });
+  });
 }
 
 Matcher _explanation(