5 files changed, 27 insertions, 21 deletions
diff --git a/files/ja/_redirects.txt b/files/ja/_redirects.txt
index ffb19699e1..820a81e1ea 100644
--- a/files/ja/_redirects.txt
+++ b/files/ja/_redirects.txt
@@ -3282,6 +3282,9 @@
 /ja/docs/Web/API/VRLayer	/ja/docs/Web/API/VRLayerInit
 /ja/docs/Web/API/VRLayer/rightBounds	/ja/docs/Web/API/VRLayerInit/rightBounds
 /ja/docs/Web/API/VRLayer/source	/ja/docs/Web/API/VRLayerInit/source
+/ja/docs/Web/API/VideoTrackList/onaddtrack	/ja/docs/conflicting/Web/API/VideoTrackList/addtrack_event
+/ja/docs/Web/API/VideoTrackList/onchange	/ja/docs/conflicting/Web/API/VideoTrackList/change_event
+/ja/docs/Web/API/VideoTrackList/onremovetrack	/ja/docs/conflicting/Web/API/VideoTrackList/removetrack_event
 /ja/docs/Web/API/WebGL_API/Adding_2D_content_to_a_WebGL_context	/ja/docs/Web/API/WebGL_API/Tutorial/Adding_2D_content_to_a_WebGL_context
 /ja/docs/Web/API/WebGL_API/Animating_objects_with_WebGL	/ja/docs/Web/API/WebGL_API/Tutorial/Animating_objects_with_WebGL
 /ja/docs/Web/API/WebGL_API/Animating_textures_in_WebGL	/ja/docs/Web/API/WebGL_API/Tutorial/Animating_textures_in_WebGL
diff --git a/files/ja/_wikihistory.json b/files/ja/_wikihistory.json
index b3c7660de8..26c9a5b78d 100644
--- a/files/ja/_wikihistory.json
+++ b/files/ja/_wikihistory.json
@@ -23185,24 +23185,6 @@
       "Wind1808"
     ]
   },
-  "Web/API/VideoTrackList/onaddtrack": {
-    "modified": "2020-10-15T22:19:19.142Z",
-    "contributors": [
-      "Wind1808"
-    ]
-  },
-  "Web/API/VideoTrackList/onchange": {
-    "modified": "2020-10-15T22:19:29.008Z",
-    "contributors": [
-      "Wind1808"
-    ]
-  },
-  "Web/API/VideoTrackList/onremovetrack": {
-    "modified": "2020-10-15T22:19:28.819Z",
-    "contributors": [
-      "Wind1808"
-    ]
-  },
   "Web/API/VideoTrackList/removetrack_event": {
     "modified": "2020-10-15T22:19:32.801Z",
     "contributors": [
@@ -48524,6 +48506,24 @@
       "Wind1808"
     ]
   },
+  "conflicting/Web/API/VideoTrackList/addtrack_event": {
+    "modified": "2020-10-15T22:19:19.142Z",
+    "contributors": [
+      "Wind1808"
+    ]
+  },
+  "conflicting/Web/API/VideoTrackList/change_event": {
+    "modified": "2020-10-15T22:19:29.008Z",
+    "contributors": [
+      "Wind1808"
+    ]
+  },
+  "conflicting/Web/API/VideoTrackList/removetrack_event": {
+    "modified": "2020-10-15T22:19:28.819Z",
+    "contributors": [
+      "Wind1808"
+    ]
+  },
   "conflicting/Web/API/WebSocket/close_event": {
     "modified": "2020-09-25T11:45:51.374Z",
     "contributors": [
diff --git a/files/ja/web/api/videotracklist/onaddtrack/index.html b/files/ja/conflicting/web/api/videotracklist/addtrack_event/index.html
index 302ab02fcb..c5f3ed096b 100644
--- a/files/ja/web/api/videotracklist/onaddtrack/index.html
+++ b/files/ja/conflicting/web/api/videotracklist/addtrack_event/index.html
@@ -1,6 +1,6 @@
 ---
 title: VideoTrackList.onaddtrack
-slug: Web/API/VideoTrackList/onaddtrack
+slug: conflicting/Web/API/VideoTrackList/addtrack_event
 tags:
   - API
   - Adding Tracks
@@ -16,6 +16,7 @@ tags:
   - onaddtrack
   - track
 translation_of: Web/API/VideoTrackList/onaddtrack
+original_slug: Web/API/VideoTrackList/onaddtrack
 ---
 <div>{{APIRef("HTML DOM")}}</div>
 
diff --git a/files/ja/web/api/videotracklist/onchange/index.html b/files/ja/conflicting/web/api/videotracklist/change_event/index.html
index bdcdf85f01..57f065f6f1 100644
--- a/files/ja/web/api/videotracklist/onchange/index.html
+++ b/files/ja/conflicting/web/api/videotracklist/change_event/index.html
@@ -1,6 +1,6 @@
 ---
 title: VideoTrackList.onchange
-slug: Web/API/VideoTrackList/onchange
+slug: conflicting/Web/API/VideoTrackList/change_event
 tags:
   - API
   - Adding Tracks
@@ -16,6 +16,7 @@ tags:
   - onchange
   - track
 translation_of: Web/API/VideoTrackList/onchange
+original_slug: Web/API/VideoTrackList/onchange
 ---
 <div>{{APIRef("HTML DOM")}}</div>
 
diff --git a/files/ja/web/api/videotracklist/onremovetrack/index.html b/files/ja/conflicting/web/api/videotracklist/removetrack_event/index.html
index 49f520f967..78cceafed7 100644
--- a/files/ja/web/api/videotracklist/onremovetrack/index.html
+++ b/files/ja/conflicting/web/api/videotracklist/removetrack_event/index.html
@@ -1,6 +1,6 @@
 ---
 title: VideoTrackList.onremovetrack
-slug: Web/API/VideoTrackList/onremovetrack
+slug: conflicting/Web/API/VideoTrackList/removetrack_event
 tags:
   - API
   - Event Handler
@@ -17,6 +17,7 @@ tags:
   - removeTrack
   - track
 translation_of: Web/API/VideoTrackList/onremovetrack
+original_slug: Web/API/VideoTrackList/onremovetrack
 ---
 <div>{{APIRef("HTML DOM")}}</div>