Remove caption warning on <audio> (#6054)

src/compiler/compile/nodes/Element.ts

@@ -519,7 +519,7 @@ export default class Element extends Node {
 			}
 		}
 
-		if (this.is_media_node()) {
+		if (this.name === 'video') {
 			if (attribute_map.has('muted')) {
 				return;
 			}
@@ -533,7 +533,7 @@ export default class Element extends Node {
 			if (!has_caption) {
 				component.warn(this, {
 					code: 'a11y-media-has-caption',
-					message: 'A11y: Media elements must have a <track kind="captions">'
+					message: 'A11y: <video> elements must have a <track kind="captions">'
 				});
 			}
 		}

test/validator/samples/a11y-media-has-caption/input.svelte

@@ -1,4 +1,4 @@
 <video><track kind="captions"/></video>
 <video></video>
 <video><track /></video>
-<audio muted></audio>
+<audio></audio>

test/validator/samples/a11y-media-has-caption/warnings.json

@@ -6,7 +6,7 @@
       "column": 15,
       "line": 2
     },
-    "message": "A11y: Media elements must have a <track kind=\"captions\">",
+    "message": "A11y: <video> elements must have a <track kind=\"captions\">",
     "pos": 40,
     "start": {
       "character": 40,
@@ -21,7 +21,7 @@
       "column": 24,
       "line": 3
     },
-    "message": "A11y: Media elements must have a <track kind=\"captions\">",
+    "message": "A11y: <video> elements must have a <track kind=\"captions\">",
     "pos": 56,
     "start": {
       "character": 56,