From 02d47214f3bf5cc913e851d21f627833a26b55d3 Mon Sep 17 00:00:00 2001
From: thePR0M3TH3AN <53631862+PR0M3TH3AN@users.noreply.github.com>
Date: Mon, 1 Jun 2026 10:54:49 -0400
Subject: [PATCH] External embed: ship a minimal transparency baseline page
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src/transparency-iframe.html is a tiny html+body=transparent
stub we serve at /transparency-iframe.html so dev hosts (and
future debug tools) can include it via iframe to confirm that
cross-origin iframe transparency is working in the target
browser without involving any of the Artstr embed JS.

Validated end-to-end:
- srcdoc iframe → magenta shows through ✓
- cross-origin minimal page → magenta shows through ✓
- cross-origin Artstr embed → magenta shows through the
  Computer_Icon's transparent ring ✓

What looked like opaque white on the stress-test host was the
artwork's natural fill + the host's pink/yellow checker reading
as noise rather than see-through. Magenta on a flat backdrop
made the transparency unambiguous.
---
 src/transparency-iframe.html | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 src/transparency-iframe.html

diff --git a/src/transparency-iframe.html b/src/transparency-iframe.html
new file mode 100644
index 0000000..8ffc963
--- /dev/null
+++ b/src/transparency-iframe.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<html>
+<head>
+<title>Minimal transparent page</title>
+<style>
+  html, body {
+    margin: 0; padding: 0;
+    background: transparent !important;
+    font: 14px system-ui, sans-serif;
+    color: #000;
+  }
+  div { padding: 8px; }
+</style>
+</head>
+<body>
+<div>Minimal page on localhost:8000.<br>If the parent's magenta backdrop shows through, cross-origin iframe transparency works in this browser.</div>
+</body>
+</html>