fix (hopefully) for video embedding in SB+

client/components/widget_sandbox_iframe.ts

@@ -54,6 +54,8 @@ export function prepareSandboxIFrame(): PreloadedIFrame {
   // This one works in all browsers, although it's probably less secure
   iframe.src = "about:blank";
   iframe.style.visibility = "hidden";
+  iframe.allow =
+    "accelerometer; autoplay; clipboard-write; encrypted-media; fullscreen; gyroscope; picture-in-picture; web-share";
 
   const ready = new Promise<void>((resolve) => {
     iframe.onload = () => {

libraries/Library/Std/Widgets/Embed.md

@@ -55,7 +55,9 @@ function embed.youtube(specOrUrl)
     src="https://www.youtube.com/embed/" .. videoId,
     style="width: " .. width .. "; height: " .. height,
     class = "sb-video-embed",
-    referrerpolicy = "strict-origin-when-cross-origin"
+    referrerpolicy = "strict-origin-when-cross-origin",
+    allow = "accelerometer; autoplay; clipboard-write; encrypted-media; fullscreen; gyroscope; picture-in-picture; web-share",
+    allowfullscreen = "true",
   })
 end