diff --git a/src/main_wpt.zig b/src/main_wpt.zig
index 744c188b..324e93cd 100644
--- a/src/main_wpt.zig
+++ b/src/main_wpt.zig
@@ -108,6 +108,7 @@ fn run(arena: Allocator, test_file: []const u8, loader: *FileLoader, err_out: *?
     const dirname = std.fs.path.dirname(test_file) orelse "";
 
     var runner = try @import("testing.zig").jsRunner(arena, .{
+        .url = "http://127.0.0.1",
         .html = html,
     });
     defer runner.deinit();
diff --git a/src/testing.zig b/src/testing.zig
index 6e8d7ab9..dfb9818b 100644
--- a/src/testing.zig
+++ b/src/testing.zig
@@ -401,7 +401,7 @@ pub const JsRunner = struct {
         self.env = try Env.init(arena, .{});
         errdefer self.env.deinit();
 
-        self.url = try URL.parse("https://lightpanda.io/opensource-browser/", null);
+        self.url = try URL.parse(opts.url, null);
 
         self.renderer = Renderer.init(arena);
         self.cookie_jar = storage.CookieJar.init(arena);
@@ -500,6 +500,7 @@ pub const JsRunner = struct {
 };
 
 const RunnerOpts = struct {
+    url: []const u8 = "https://lightpanda.io/opensource-browser/",
     html: []const u8 =
         \\ <div id="content">
         \\   <a id="link" href="foo" class="ok">OK</a>