diff --git a/searchurl/txt/markdeep.html b/searchurl/txt/markdeep.html
new file mode 100644
index 00000000..45218114
--- /dev/null
+++ b/searchurl/txt/markdeep.html
@@ -0,0 +1,52 @@
+<head>
+  <link rel="stylesheet" href="https://morgan3d.github.io/markdeep/latest/latex.css?"><!-- Markdeep: --><style class="fallback">body{visibility:hidden}</style>
+  <script src="https://morgan3d.github.io/markdeep/latest/markdeep.min.js?" charset="utf-8"></script>
+  <script>
+    window.addEventListener('hashchange',loadSlice);
+    function absFile(url) {
+      this.name=url;
+      this.slice = async(offset, length) =>{
+        const headers = new Headers();
+        headers.append('range', 'bytes=' + offset + '-' + ( offset + length -1).toString());
+
+        const opts = {
+          credentials: 'include',
+          headers    : headers
+        };
+
+        const resp = await fetch( this.name, opts );
+        return await resp.arrayBuffer();
+        //alert(JSON.stringify(resp.headers));
+        //return await resp.text();
+      }
+    }
+    
+    var uwebfile;
+    function loadSlice(){
+      var page = 1;
+      var blocksize = 1024;
+      var extrasize = 2048;
+
+      let lhash = location.hash;
+      if(lhash)
+        page = parseInt(lhash.substring(6),10);
+      uwebfile.slice(blocksize*(page-1),blocksize+extrasize).then((buffer)=>{
+        let u8 = new Uint8Array(buffer);
+        let iStart = 0;
+        if(1!=page){
+          while(10!=u8[iStart]) iStart++;
+        }
+        let iEnd = u8.indexOf(10,blocksize);//fine newline(10)
+        if(-1==iEnd) iEnd = blocksize;
+        iEnd++;
+        document.body.innerHTML = new TextDecoder().decode(u8.slice(iStart,iEnd));
+      });
+
+    }
+    //?url=#page=
+    uwebfile = new absFile(location.search.substring(5));
+    loadSlice();
+  </script>
+</head>
+<body>
+<body>
diff --git a/searchurl/txt/markdeep.html~ b/searchurl/txt/markdeep.html~
new file mode 100644
index 00000000..3f95a521
--- /dev/null
+++ b/searchurl/txt/markdeep.html~
@@ -0,0 +1,54 @@
+<head>
+  <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
+  <script>
+    function absFile(url) {
+      this.name=url;
+      this.slice = async(offset, length) =>{
+        const headers = new Headers();
+        headers.append('range', 'bytes=' + offset + '-' + ( offset + length -1).toString());
+
+        const opts = {
+          credentials: 'include',
+          headers    : headers
+        };
+
+        const resp = await fetch( this.name, opts );
+        return await resp.arrayBuffer();
+        //alert(JSON.stringify(resp.headers));
+        //return await resp.text();
+      }
+    }
+    
+    var url;
+    var page = 1;
+    var blocksize = 1024;
+    var extrasize = 2048;
+    var file;
+    function loadSlice(){
+      let lhash = location.hash;
+      if(lhash)
+        page = parseInt(lhash.substring(6),10);
+      file.slice(blocksize*(page-1),blocksize+extrasize).then((buffer)=>{
+        let u8 = new Uint8Array(buffer);
+        let iStart = 0;
+        if(1!=page){
+          while(10!=u8[iStart]) iStart++;
+        }
+        let iEnd = u8.indexOf(10,blocksize);//fine newline(10)
+        if(-1==iEnd) iEnd = blocksize;
+        iEnd++;
+        document.body.innerHTML = marked(new TextDecoder().decode(u8.slice(iStart,iEnd)));
+      });
+
+    }
+    window.addEventListener('hashchange',loadSlice);
+  </script>
+</head>
+<body>
+  <script>
+    //?url=#page=
+    file = new absFile(location.search.substring(5));
+    //let viewElement = document.querySelector("#viewer");
+    loadSlice();
+  </script>
+<body>
diff --git a/searchurl/txt/txtview.html b/searchurl/txt/txtview.html
index 3f95a521..42dbe200 100644
--- a/searchurl/txt/txtview.html
+++ b/searchurl/txt/txtview.html
@@ -1,5 +1,5 @@
 <head>
-  <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/marked@3.0.7/marked.min.js"></script>
   <script>
     function absFile(url) {
       this.name=url;
@@ -22,7 +22,7 @@
     var url;
     var page = 1;
     var blocksize = 1024;
-    var extrasize = 2048;
+    var extrasize = 1024; //extrasize should <= blocksize
     var file;
     function loadSlice(){
       let lhash = location.hash;
@@ -32,11 +32,20 @@
         let u8 = new Uint8Array(buffer);
         let iStart = 0;
         if(1!=page){
-          while(10!=u8[iStart]) iStart++;
+          for(let i=1;i<extrasize;i=i+2){
+            if(10==u8[i] && 10==u8[i-1]) {
+              iStart = i+1;
+              break;
+            }
+          }
+        }
+        let iEnd = blocksize;
+        for(let i=blocksize+1;i<blocksize+extrasize;i=i+2){
+          if(10==u8[i] && 10==u8[i-1]) {
+            iEnd = i+1;
+            break;
+          }
         }
-        let iEnd = u8.indexOf(10,blocksize);//fine newline(10)
-        if(-1==iEnd) iEnd = blocksize;
-        iEnd++;
         document.body.innerHTML = marked(new TextDecoder().decode(u8.slice(iStart,iEnd)));
       });
 
