Added support for <video> tag

lib/src/utils/html2md_utils.dart

@@ -55,8 +55,29 @@ class Html2MdRules {
     //Is used a local underline implemenation since markdown just use underline with html tags
     return '<und>$content<und>';
   });
-  static final videoRule =
+  static final videoRule = hmd.Rule('video', filters: ['iframe', 'video'],
-      hmd.Rule('video', filters: ['iframe'], replacement: (content, node) {
+      replacement: (content, node) {
+    //This need to be verified by a different way of iframes, since video tag can have <source> children
+    if (node.nodeName == 'video') {
+      //if has children then just will be taked as different part of code
+      if (node.childNum > 0) {
+        var child = node.firstChild!;
+        var src = child.getAttribute('src');
+        if (src == null) {
+          child = node.childNodes().last;
+          src = child.getAttribute('src');
+        }
+        if (!youtubeVideoUrlValidator.hasMatch(src ?? '')) {
+          return '<video>${child.outerHTML}</video>';
+        }
+        return '[$content]($src)';
+      }
+      final src = node.getAttribute('src');
+      if (src == null || !youtubeVideoUrlValidator.hasMatch(src)) {
+        return node.outerHTML;
+      }
+      return '[$content]($src)';
+    }
     //by now, we can only access to src
     final src = node.getAttribute('src');
     //if the source is null or is not valid youtube url, then just return the html instead remove it

test/utils/delta_x_test.dart

@@ -9,8 +9,12 @@ void main() {
   const htmlWithUnderline =
       '<p>This is a normal sentence, and this section has greater <u>underline</u>';
 
-  const htmlWithVideo =
+  const htmlWithIframeVideo =
       '<iframe src="https://www.youtube.com/embed/dQw4w9WgXcQ" title="YouTube video player"></iframe>';
+
+  const htmlWithVideoTag =
+      '''<video src="https://www.youtube.com/embed/dQw4w9WgXcQ">Your browser does not support the video tag.</video> 
+''';
   final expectedDeltaEmp = Delta.fromOperations([
     Operation.insert(
         'This is a normal sentence, and this section has greater emp'),
@@ -40,8 +44,13 @@ void main() {
     expect(delta, expectedDeltaUnderline);
   });
 
+  test('should detect iframe and parse correctly', () {
+    final delta = DeltaX.fromHtml(htmlWithIframeVideo);
+    expect(delta, expectedDeltaVideo);
+  });
+
   test('should detect video and parse correctly', () {
-    final delta = DeltaX.fromHtml(htmlWithVideo);
+    final delta = DeltaX.fromHtml(htmlWithVideoTag);
     expect(delta, expectedDeltaVideo);
   });
 }