From 81fadf836f305a9065bbebe21ca38afb7b12c8ee Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Tue, 27 Apr 2021 08:59:59 -0400
Subject: [PATCH] Stop autoplay for unset media source with
 no-large-media-elements

Related feedback:
- https://www.reddit.com/r/uBlockOrigin/comments/mxgpmc/
---
 src/js/scriptlets/load-large-media-interactive.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/js/scriptlets/load-large-media-interactive.js b/src/js/scriptlets/load-large-media-interactive.js
index 2af43502b..d5ed30847 100644
--- a/src/js/scriptlets/load-large-media-interactive.js
+++ b/src/js/scriptlets/load-large-media-interactive.js
@@ -213,6 +213,19 @@ const onLoadedData = function(ev) {
     media.pause();
 };
 
+// https://www.reddit.com/r/uBlockOrigin/comments/mxgpmc/
+//   Support cases where the media source is not yet set.
+for ( const media of document.querySelectorAll('audio,video') ) {
+    const src = media.src;
+    if (
+        (typeof src === 'string') &&
+        (src === '' || src.startsWith('blob:'))
+    ) {
+        media.autoplay = false;
+        media.pause();
+    }
+}
+
 document.addEventListener('loadeddata', onLoadedData);
 
 /******************************************************************************/