From e6782e61a815163d92ddb4781d319bbc7c1b8ddf Mon Sep 17 00:00:00 2001
From: Linus Rath <139418639+rathlinus@users.noreply.github.com>
Date: Thu, 21 May 2026 17:59:24 +0200
Subject: [PATCH] fix: sync plugin slot iframe height with reported content
 height

---
 lib/plugin-sandbox/host-bridge.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/plugin-sandbox/host-bridge.ts b/lib/plugin-sandbox/host-bridge.ts
index a421a136..dd41be52 100644
--- a/lib/plugin-sandbox/host-bridge.ts
+++ b/lib/plugin-sandbox/host-bridge.ts
@@ -236,6 +236,10 @@ export class SandboxInstance {
       }
 
       case 'slot-resize':
+        // The iframe has no intrinsic height — sync it to the content height
+        // the sandbox reported, otherwise the wrapper reserves space but the
+        // iframe stays at 0px and the slot appears blank.
+        this.iframe.style.height = `${msg.height}px`;
         this.slotResizeCb?.(msg.height);
         return;
     }