feat: optimization2

Author: SooY2

optimization-http2/index.html

@@ -15,7 +15,12 @@
       media="print"
       onload="this.media='all'"
     />
-    <link rel="stylesheet" href="./css/style4.css" />
+    <link
+      rel="stylesheet"
+      href="./css/style4.css"
+      media="print"
+      onload="this.media='all'"
+    />
     <link rel="stylesheet" href="./css/style5.css" />
 
     <link