test(browser): compare ax.find across both hosts on one page

test/browser/testdata/find-order/spec.ts

@@ -0,0 +1,17 @@
+import { always, extract, taps } from "@sanderling/spec";
+
+// Which of the two #x a selector means is the whole fixture. The reading is
+// compared between the two hosts by TestBrowserAxFindAgreesAcrossHosts, which
+// drives each host's production path and never asks one what the other said.
+//
+// Written in the "k:v" string grammar because that is the one form both hosts
+// resolve the same way: the object form {id: "x"} reaches the goja host as a
+// plain attribute filter, and a web hierarchy dump carries the id under
+// resource-id, so it matches nothing there.
+const found = extract((s) => s.ax.find("id:x")?.text).named("found");
+
+const findsTheShadowMatch = always(() => found.current === "shadow");
+
+export const properties = { findsTheShadowMatch };
+
+export const actionsRoot = taps;