diff --git a/packages/danmaku/src/xml.test.ts b/packages/danmaku/src/xml.test.ts
index 008e6e1..5f78a9d 100644
--- a/packages/danmaku/src/xml.test.ts
+++ b/packages/danmaku/src/xml.test.ts
@@ -4,12 +4,51 @@ import { openCommentsToXml, parseDanmakuXml, serializeDanmakuXml } from "./xml.j
 describe("xml round-trip", () => {
     it("parse then serialize preserves time/mode/text", () => {
         const xml = openCommentsToXml([{ p: "1.5,1,25,16777215,0,0,u,1", m: "你好<hello>" }]);
+        expect(xml).toContain('p="1.5,1,25,16777215,0,0,u,1"');
         const list = parseDanmakuXml(xml);
         expect(list).toHaveLength(1);
         expect(list[0]?.time).toBeCloseTo(1.5);
         expect(list[0]?.mode).toBe(1);
         expect(list[0]?.text).toBe("你好<hello>");
         const again = parseDanmakuXml(serializeDanmakuXml(list));
+        expect(again[0]?.time).toBeCloseTo(1.5);
+        expect(again[0]?.mode).toBe(1);
+        expect(again[0]?.size).toBe(25);
+        expect(again[0]?.color).toBe(16777215);
+        expect(again[0]?.uid).toBe("u");
+        expect(again[0]?.rowId).toBe("1");
         expect(again[0]?.text).toBe("你好<hello>");
     });
 });
+
+describe("parseDanmakuXml tolerance", () => {
+    it("4-segment p falls back size/color/uid/rowId to defaults", () => {
+        const list = parseDanmakuXml('<?xml version="1.0"?><i><d p="12.5,1,0,0">x</d></i>');
+        expect(list).toHaveLength(1);
+        expect(list[0]?.time).toBeCloseTo(12.5);
+        expect(list[0]?.mode).toBe(1);
+        expect(list[0]?.size).toBe(0);
+        expect(list[0]?.color).toBe(0);
+        expect(list[0]?.timestamp).toBe(0);
+        expect(list[0]?.pool).toBe(0);
+        expect(list[0]?.uid).toBe("");
+        expect(list[0]?.rowId).toBe("");
+        expect(list[0]?.text).toBe("x");
+    });
+
+    it("shorter p defaults size/color to 0 and mode to 1", () => {
+        const two = parseDanmakuXml('<?xml version="1.0"?><i><d p="1.5,1">y</d></i>');
+        expect(two[0]?.time).toBeCloseTo(1.5);
+        expect(two[0]?.mode).toBe(1);
+        expect(two[0]?.size).toBe(0);
+        expect(two[0]?.color).toBe(0);
+        expect(two[0]?.uid).toBe("");
+        expect(two[0]?.rowId).toBe("");
+
+        const one = parseDanmakuXml('<?xml version="1.0"?><i><d p="3">z</d></i>');
+        expect(one[0]?.time).toBe(3);
+        expect(one[0]?.mode).toBe(1);
+        expect(one[0]?.size).toBe(0);
+        expect(one[0]?.color).toBe(0);
+    });
+});