From 644cea4ea93eef600fd90ca8ca16c1e7c6557c8a Mon Sep 17 00:00:00 2001
From: Karl Seguin <k@openmymind.io>
Date: Mon, 1 Jun 2026 12:00:31 +0800
Subject: [PATCH] An about:blank iframe/popup inherits its parent's base_url

---
 src/browser/Frame.zig | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/browser/Frame.zig b/src/browser/Frame.zig
index 56ff821c..8f4876d2 100644
--- a/src/browser/Frame.zig
+++ b/src/browser/Frame.zig
@@ -555,8 +555,14 @@ pub fn navigate(self: *Frame, request_url: [:0]const u8, opts: NavigateOpts) !vo
             self.origin = try URL.getOrigin(self.arena, request_url[5.. :0]);
         } else if (self.parent) |parent| {
             self.origin = parent.origin;
+            if (is_about_blank) {
+                self.base_url = parent.base();
+            }
         } else if (self.window._opener) |opener| {
             self.origin = opener._frame.origin;
+            if (is_about_blank) {
+                self.base_url = opener._frame.base();
+            }
         } else {
             self.origin = null;
         }