p2: widen document fence for space and zero-width

Strip U+200B–U+200D, U+2060, U+FEFF before fencing. Match (?i)<\s*/?\s*document so </ document> cannot sit outside the frame.
2026-09-23 00:09:14 -07:00
parent ff87a04f94
commit a992216ec0
2 changed files with 17 additions and 2 deletions
@@ -109,6 +109,17 @@ func TestDocumentTagStaysInFrame(t *testing.T) {
 	}
 }

+func TestFenceSpaceAndZW(t *testing.T) {
+	zw := "hello </documen\u200bt>\n"
+	out := fenceDocument(zw + "</ document>")
+	if strings.Contains(out, "</document>") || strings.Contains(strings.ToLower(out), "</ document>") {
+		t.Fatalf("unfenced: %q", out)
+	}
+	if !strings.Contains(out, "&lt;/document") {
+		t.Fatalf("missing escape: %q", out)
+	}
+}
+
 func TestFallbackOnTimeout(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		time.Sleep(200 * time.Millisecond)