diff --git a/ext/wasm/api/sqlite3-api-oo1.js b/ext/wasm/api/sqlite3-api-oo1.js
index e0f812baa7..4f7ffe1cd8 100644
--- a/ext/wasm/api/sqlite3-api-oo1.js
+++ b/ext/wasm/api/sqlite3-api-oo1.js
@@ -495,24 +495,25 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
       }
     },
     /**
-       Similar to this.filename but will return a falsy value for
-       special names like ":memory:". Throws if the DB has been
-       closed. If passed an argument it then it will return the
+       Similar to the this.filename property but will return a falsy
+       value for special names like ":memory:". Throws if the DB has
+       been closed. If passed an argument it then it will return the
        filename of the ATTACHEd db with that name, else it assumes a
-       name of `main`.
+       name of `main`. The argument may be either a JS string or
+       a pointer to a WASM-allocated C-string.
     */
     getFilename: function(dbName='main'){
       return capi.sqlite3_db_filename(affirmDbOpen(this).pointer, dbName);
     },
     /**
        Returns true if this db instance has a name which resolves to a
-       file. If the name is "" or ":memory:", it resolves to false.
+       file. If the name is "" or starts with ":", it resolves to false.
        Note that it is not aware of the peculiarities of URI-style
        names and a URI-style name for a ":memory:" db will fool it.
        Returns false if this db is closed.
     */
     hasFilename: function(){
-      return this.filename && ':memory'!==this.filename;
+      return this.filename && ':'!==this.filename[0];
     },
     /**
        Returns the name of the given 0-based db number, as documented
@@ -525,9 +526,13 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
        Compiles the given SQL and returns a prepared Stmt. This is
        the only way to create new Stmt objects. Throws on error.
 
-       The given SQL must be a string, a Uint8Array holding SQL, or a
-       WASM pointer to memory holding the NUL-terminated SQL string.
-       If the SQL contains no statements, an SQLite3Error is thrown.
+       The given SQL must be a string, a Uint8Array holding SQL, a
+       WASM pointer to memory holding the NUL-terminated SQL string,
+       or an array of strings. In the latter case, the array is
+       concatenated together, with no separators, to form the SQL
+       string (arrays are often a convenient way to formulate long
+       statements).  If the SQL contains no statements, an
+       SQLite3Error is thrown.
 
        Design note: the C API permits empty SQL, reporting it as a 0
        result code and a NULL stmt pointer. Supporting that case here
@@ -541,6 +546,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
     */
     prepare: function(sql){
       affirmDbOpen(this);
+      if(Array.isArray(sql)) sql = sql.join('');
       const stack = capi.wasm.scopedAllocPush();
       let ppStmt, pStmt;
       try{
diff --git a/ext/wasm/api/sqlite3-api-opfs.js b/ext/wasm/api/sqlite3-api-opfs.js
index e28e47ab6c..a346443f56 100644
--- a/ext/wasm/api/sqlite3-api-opfs.js
+++ b/ext/wasm/api/sqlite3-api-opfs.js
@@ -883,12 +883,15 @@ sqlite3.installOpfsVfs = function callee(asyncProxyUri = callee.defaultProxyUri)
        hook in to any C-side calls to sqlite3_initialize(), so we
        cannot add an after-initialize callback mechanism.
     */
-    opfsUtil.reregisterVfs = (asDefault=false)=>{
+    opfsUtil.registerVfs = (asDefault=false)=>{
       return capi.wasm.exports.sqlite3_vfs_register(
         opfsVfs.pointer, asDefault ? 1 : 0
       );
     };
-    
+
+    //TODO to support fiddle db upload:
+    //opfsUtil.createFile = function(absName, content=undefined){...}
+
     if(sqlite3.oo1){
       opfsUtil.OpfsDb = function(...args){
         const opt = sqlite3.oo1.dbCtorHelper.normalizeArgs(...args);
diff --git a/ext/wasm/api/sqlite3-api-prologue.js b/ext/wasm/api/sqlite3-api-prologue.js
index b5cd292fc5..b2d8809377 100644
--- a/ext/wasm/api/sqlite3-api-prologue.js
+++ b/ext/wasm/api/sqlite3-api-prologue.js
@@ -120,7 +120,7 @@
      the `free(3)`-compatible routine for the WASM
      environment. Defaults to `"free"`.
 
-   - `persistentDirName`[^1]: if the environment supports persistent storage, this
+   - `wasmfsOpfsDir`[^1]: if the environment supports persistent storage, this
      directory names the "mount point" for that directory. It must be prefixed
      by `/` and may currently contain only a single directory-name part. Using
      the root directory name is not supported by any current persistent backend.
@@ -157,7 +157,7 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
       })(),
       allocExportName: 'malloc',
       deallocExportName: 'free',
-      persistentDirName: '/persistent'
+      wasmfsOpfsDir: '/opfs'
     };
     Object.keys(configDefaults).forEach(function(k){
       config[k] = Object.getOwnPropertyDescriptor(apiConfig, k)
@@ -174,7 +174,7 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
   [
     // If any of these config options are functions, replace them with
     // the result of calling that function...
-    'Module', 'exports', 'memory', 'persistentDirName'
+    'Module', 'exports', 'memory', 'wasmfsOpfsDir'
   ].forEach((k)=>{
     if('function' === typeof config[k]){
       config[k] = config[k]();
@@ -185,8 +185,8 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
       all args with a space between each. */
   const toss = (...args)=>{throw new Error(args.join(' '))};
 
-  if(config.persistentDirName && !/^\/[^/]+$/.test(config.persistentDirName)){
-    toss("config.persistentDirName must be falsy or in the form '/dir-name'.");
+  if(config.wasmfsOpfsDir && !/^\/[^/]+$/.test(config.wasmfsOpfsDir)){
+    toss("config.wasmfsOpfsDir must be falsy or in the form '/dir-name'.");
   }
 
   /**
@@ -727,7 +727,7 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
   capi.sqlite3_web_persistent_dir = function(){
     if(undefined !== __persistentDir) return __persistentDir;
     // If we have no OPFS, there is no persistent dir
-    const pdir = config.persistentDirName;
+    const pdir = config.wasmfsOpfsDir;
     if(!pdir
        || !self.FileSystemHandle
        || !self.FileSystemDirectoryHandle
@@ -748,7 +748,6 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
         const pVfs = sqlite3.capi.sqlite3_vfs_find("unix-none");
         if(pVfs){
           capi.sqlite3_vfs_register(pVfs,1);
-          console.warn("Installed 'unix-none' as the default sqlite3 VFS.");
         }
         return __persistentDir = pdir;
       }else{
diff --git a/ext/wasm/api/sqlite3-wasm.c b/ext/wasm/api/sqlite3-wasm.c
index cf9a1a3db6..8750d9b207 100644
--- a/ext/wasm/api/sqlite3-wasm.c
+++ b/ext/wasm/api/sqlite3-wasm.c
@@ -571,7 +571,7 @@ int sqlite3_wasm_vfs_unlink(const char * zName){
 WASM_KEEP
 int sqlite3_wasm_init_wasmfs(const char *zMountPoint){
   static backend_t pOpfs = 0;
-  if( !zMountPoint || !*zMountPoint ) zMountPoint = "/persistent";
+  if( !zMountPoint || !*zMountPoint ) zMountPoint = "/opfs";
   if( !pOpfs ){
     pOpfs = wasmfs_create_opfs_backend();
     if( pOpfs ){
@@ -595,7 +595,8 @@ int sqlite3_wasm_init_wasmfs(const char *zMountPoint){
 }
 #else
 WASM_KEEP
-int sqlite3_wasm_init_wasmfs(void){
+int sqlite3_wasm_init_wasmfs(const char *zUnused){
+  if(zUnused){/*unused*/}
   return SQLITE_NOTFOUND;
 }
 #endif /* __EMSCRIPTEN__ && SQLITE_WASM_WASMFS */
diff --git a/ext/wasm/common/SqliteTestUtil.js b/ext/wasm/common/SqliteTestUtil.js
index 779f271fb4..277ab55294 100644
--- a/ext/wasm/common/SqliteTestUtil.js
+++ b/ext/wasm/common/SqliteTestUtil.js
@@ -221,7 +221,7 @@
        sqlite3 API.
     */
     sqlite3ApiConfig: {
-      persistentDirName: "/persistent"
+      wasmfsOpfsDir: "/opfs"
     },
     /**
        Intended to be called by apps which need to call the
diff --git a/ext/wasm/demo-123.js b/ext/wasm/demo-123.js
index c7dc4c769c..5ba1f1df77 100644
--- a/ext/wasm/demo-123.js
+++ b/ext/wasm/demo-123.js
@@ -44,7 +44,7 @@
           oo = sqlite3.oo1/*high-level OO API*/;
     log("sqlite3 version",capi.sqlite3_libversion(), capi.sqlite3_sourceid());
     const db = new oo.DB("/mydb.sqlite3");
-    log("transient b =",db.filename);
+    log("transient db =",db.filename);
     /**
        Never(!) rely on garbage collection to clean up DBs and
        (especially) prepared statements. Always wrap their lifetimes
@@ -82,7 +82,12 @@
       }    
 
       log("Insert using a prepared statement...");
-      let q = db.prepare("insert into t(a,b) values(?,?)");
+      let q = db.prepare([
+        // SQL may be a string or array of strings
+        // (concatenated w/o separators).
+        "insert into t(a,b) ",
+        "values(?,?)"
+      ]);
       try {
         for( i = 100; i < 103; ++i ){
           q.bind( [i, i*2] ).step();
diff --git a/ext/wasm/fiddle/fiddle-worker.js b/ext/wasm/fiddle/fiddle-worker.js
index dd82914655..b0c0526f8c 100644
--- a/ext/wasm/fiddle/fiddle-worker.js
+++ b/ext/wasm/fiddle/fiddle-worker.js
@@ -170,7 +170,7 @@
         stdout("\nOPFS is available. To open a persistent db, use:\n\n",
                "  .open file:name?vfs=opfs\n\nbut note that some",
                "features (e.g. upload) do not yet work with OPFS.");
-        S.opfs.reregisterVfs();
+        S.opfs.registerVfs();
       }
       stdout('\nEnter ".help" for usage hints.');
       this.exec([ // initialization commands...
diff --git a/ext/wasm/index.html b/ext/wasm/index.html
index ee31306bb7..20668db20e 100644
--- a/ext/wasm/index.html
+++ b/ext/wasm/index.html
@@ -14,7 +14,7 @@
       builds. All of them require that this directory have been
       "make"d first. The intent is that <em>this</em> page be run
       using:</div>
-    <blockquote><pre>althttpd -page index.html</pre></blockquote>
+    <blockquote><pre>althttpd -enable-sab -page index.html</pre></blockquote>
     <div>and the individual tests be started in their own tab.
       Warnings and Caveats:
       <ul class='warning'>
@@ -23,9 +23,8 @@
           <a href='https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Opener-Policy'>COOP</a>
           and
           <a href='https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy'>COEP</a>
-          headers. The default build
-          of <a href='https://sqlite.org/althttpd'>althttpd</a>
-          <em>does not</em>.
+          headers. <a href='https://sqlite.org/althttpd'>althttpd</a> requires the
+          <code>-enable-sab</code> flag for that.
         </li>
         <li>Any OPFS-related pages require very recent version of
           Chrome or Chromium (v102 at least, possibly newer). OPFS
@@ -37,9 +36,6 @@
           page may depend on build-time options which are <em>off by
           default</em> because they currently (as of 2022-09-08) break
           with Worker-based pages.
-          <!-- Similarly, WASMFS does not work on some platforms,
-               e.g. Raspberry Pi 4 (for which there is no Chrome
-               build, so it's currently a moot point). -->
         </li>
       </ul>
     </div>
@@ -63,9 +59,9 @@
         <li>speedtest1 ports (sqlite3's primary benchmarking tool)...
           <ul>
             <li><a href='speedtest1.html'>speedtest1</a>: a main-thread WASM build of speedtest1.</li>
-            <li><a href='speedtest1-wasmfs.html'>speedtest1-wasmfs</a>: a variant of speedtest1 built solely for the wasmfs/opfs feature.</li>
+            <li><a href='speedtest1-wasmfs.html?flags=--size,25'>speedtest1-wasmfs</a>: a variant of speedtest1 built solely for the wasmfs/opfs feature.</li>
             <li><a href='speedtest1.html?vfs=kvvfs'>speedtest1-kvvfs</a>: speedtest1 with the kvvfs.</li>
-            <li><a href='speedtest1-worker.html'>speedtest1-worker</a>: an interactive Worker-thread variant of speedtest1.</li>
+            <li><a href='speedtest1-worker.html?size=25'>speedtest1-worker</a>: an interactive Worker-thread variant of speedtest1.</li>
             <li><a href='speedtest1-worker.html?vfs=opfs&size=25'>speedtest1-worker-opfs</a>: speedtest1-worker with the
               OPFS VFS preselected and configured for a moderate workload.</li>
           </ul>
diff --git a/ext/wasm/speedtest1-wasmfs.html b/ext/wasm/speedtest1-wasmfs.html
index 37155282cd..6952fc1eed 100644
--- a/ext/wasm/speedtest1-wasmfs.html
+++ b/ext/wasm/speedtest1-wasmfs.html
@@ -39,115 +39,113 @@
     <script src="common/SqliteTestUtil.js"></script>
     <script src="speedtest1-wasmfs.js"></script>
     <script>(function(){
-        /**
-           If this environment contains OPFS, this function initializes it and
-           returns the name of the dir on which OPFS is mounted, else it returns
-           an empty string.
-        */
-        const wasmfsDir = function f(wasmUtil){
-          if(undefined !== f._) return f._;
-          const pdir = '/persistent';
-          if( !self.FileSystemHandle
-              || !self.FileSystemDirectoryHandle
-              || !self.FileSystemFileHandle){
+    /**
+       If this environment contains OPFS, this function initializes it and
+       returns the name of the dir on which OPFS is mounted, else it returns
+       an empty string.
+    */
+    const wasmfsDir = function f(wasmUtil,dirName="/opfs"){
+        if(undefined !== f._) return f._;
+        if( !self.FileSystemHandle
+            || !self.FileSystemDirectoryHandle
+            || !self.FileSystemFileHandle){
             return f._ = "";
-          }
-          try{
+        }
+        try{
             if(0===wasmUtil.xCallWrapped(
-              'sqlite3_wasm_init_wasmfs', 'i32', ['string'], pdir
+                'sqlite3_wasm_init_wasmfs', 'i32', ['string'], dirName
             )){
-              return f._ = pdir;
+                return f._ = dirName;
             }else{
-              return f._ = "";
+                return f._ = "";
             }
-          }catch(e){
+        }catch(e){
             // sqlite3_wasm_init_wasmfs() is not available
             return f._ = "";
-          }
-        };
-        wasmfsDir._ = undefined;
+        }
+    };
+    wasmfsDir._ = undefined;
 
-        const eOut = document.querySelector('#test-output');
-        const log2 = function(cssClass,...args){
-          const ln = document.createElement('div');
-          if(cssClass) ln.classList.add(cssClass);
-          ln.append(document.createTextNode(args.join(' ')));
-          eOut.append(ln);
-          //this.e.output.lastElementChild.scrollIntoViewIfNeeded();
-        };
-        const logList = [];
-        const dumpLogList = function(){
-          logList.forEach((v)=>log2('',v));
-          logList.length = 0;
-        };
-        /* can't update DOM while speedtest is running unless we run
-           speedtest in a worker thread. */;
-        const log = (...args)=>{
-          console.log(...args);
-          logList.push(args.join(' '));
-        };
-        const logErr = function(...args){
-          console.error(...args);
-          logList.push('ERROR: '+args.join(' '));
-        };
+    const eOut = document.querySelector('#test-output');
+    const log2 = function(cssClass,...args){
+        const ln = document.createElement('div');
+        if(cssClass) ln.classList.add(cssClass);
+        ln.append(document.createTextNode(args.join(' ')));
+        eOut.append(ln);
+        //this.e.output.lastElementChild.scrollIntoViewIfNeeded();
+    };
+    const logList = [];
+    const dumpLogList = function(){
+        logList.forEach((v)=>log2('',v));
+        logList.length = 0;
+    };
+    /* can't update DOM while speedtest is running unless we run
+       speedtest in a worker thread. */;
+    const log = (...args)=>{
+        console.log(...args);
+        logList.push(args.join(' '));
+    };
+    const logErr = function(...args){
+        console.error(...args);
+        logList.push('ERROR: '+args.join(' '));
+    };
 
-        const runTests = function(sqlite3){
-          console.log("Module inited.");
-          const wasm = sqlite3.capi.wasm;
-          const unlink = wasm.xWrap("sqlite3_wasm_vfs_unlink", "int", ["string"]);
-          const pDir = wasmfsDir(wasm);
-          if(pDir) log2('',"Persistent storage:",pDir);
-          else{
+    const runTests = function(sqlite3){
+        console.log("Module inited.");
+        const wasm = sqlite3.capi.wasm;
+        const unlink = wasm.xWrap("sqlite3_wasm_vfs_unlink", "int", ["string"]);
+        const pDir = wasmfsDir(wasm);
+        if(pDir) log2('',"Persistent storage:",pDir);
+        else{
             log2('error',"Expecting persistent storage in this build.");
             return;
-          }
-          const scope = wasm.scopedAllocPush();
-          const dbFile = pDir+"/speedtest1.db";
-          const urlParams = self.SqliteTestUtil.processUrlArgs();
-          const argv = ["speedtest1"];
-          if(urlParams.flags){
-            argv.push(...(urlParams.flags.split(',')));
+        }
+        const scope = wasm.scopedAllocPush();
+        const dbFile = pDir+"/speedtest1.db";
+        const urlParams = new URL(self.location.href).searchParams;
+        const argv = ["speedtest1"];
+        if(urlParams.has('flags')){
+            argv.push(...(urlParams.get('flags').split(',')));
             let i = argv.indexOf('--vfs');
             if(i>=0) argv.splice(i,2);
-          }else{
+        }else{
             argv.push(
-              "--singlethread",
-              "--nomutex",
-              "--nosync",
-              "--nomemstat"
+                "--singlethread",
+                "--nomutex",
+                "--nosync",
+                "--nomemstat"
             );
             //"--memdb", // note that memdb trumps the filename arg
-          }
+        }
 
-          if(argv.indexOf('--memdb')>=0){
+        if(argv.indexOf('--memdb')>=0){
             log2('error',"WARNING: --memdb flag trumps db filename.");
-          }
-          argv.push("--big-transactions"/*important for tests 410 and 510!*/,
-                    dbFile);
-          console.log("argv =",argv);
-          // These log messages are not emitted to the UI until after main() returns. Fixing that
-          // requires moving the main() call and related cleanup into a timeout handler.
-          if(pDir) unlink(dbFile);
-          log2('',"Starting native app:\n ",argv.join(' '));
-          log2('',"This will take a while and the browser might warn about the runaway JS.",
-               "Give it time...");
-          logList.length = 0;
-          setTimeout(function(){
+        }
+        argv.push("--big-transactions"/*important for tests 410 and 510!*/,
+                  dbFile);
+        console.log("argv =",argv);
+        // These log messages are not emitted to the UI until after main() returns. Fixing that
+        // requires moving the main() call and related cleanup into a timeout handler.
+        if(pDir) unlink(dbFile);
+        log2('',"Starting native app:\n ",argv.join(' '));
+        log2('',"This will take a while and the browser might warn about the runaway JS.",
+             "Give it time...");
+        logList.length = 0;
+        setTimeout(function(){
             wasm.xCall('wasm_main', argv.length,
                        wasm.scopedAllocMainArgv(argv));
             wasm.scopedAllocPop(scope);
             if(pDir) unlink(dbFile);
             logList.unshift("Done running native main(). Output:");
             dumpLogList();
-          }, 25);
-        }/*runTests()*/;
+        }, 25);
+    }/*runTests()*/;
 
-        self.sqlite3TestModule.print = log;
-        self.sqlite3TestModule.printErr = logErr;
-        sqlite3Speedtest1InitModule(self.sqlite3TestModule).then(function(M){
-            runTests(M.sqlite3);
-        });
-      })();
-    </script>
+    self.sqlite3TestModule.print = log;
+    self.sqlite3TestModule.printErr = logErr;
+    sqlite3Speedtest1InitModule(self.sqlite3TestModule).then(function(M){
+        runTests(M.sqlite3);
+    });
+})();</script>
   </body>
 </html>
diff --git a/ext/wasm/speedtest1-worker.html b/ext/wasm/speedtest1-worker.html
index b1bc3aace5..b5e1089b68 100644
--- a/ext/wasm/speedtest1-worker.html
+++ b/ext/wasm/speedtest1-worker.html
@@ -127,75 +127,75 @@
       }
     </style>
     <script>(function(){
-      'use strict';
-      const E = (sel)=>document.querySelector(sel);
-      const eOut = E('#test-output');
-      const log2 = function(cssClass,...args){
+    'use strict';
+    const E = (sel)=>document.querySelector(sel);
+    const eOut = E('#test-output');
+    const log2 = function(cssClass,...args){
         let ln;
         if(1 || cssClass){
-          ln = document.createElement('div');
-          if(cssClass) ln.classList.add(cssClass);
-          ln.append(document.createTextNode(args.join(' ')));
+            ln = document.createElement('div');
+            if(cssClass) ln.classList.add(cssClass);
+            ln.append(document.createTextNode(args.join(' ')));
         }else{
-          // This doesn't work with the "reverse order" option!
-          ln = document.createTextNode(args.join(' ')+'\n');
+            // This doesn't work with the "reverse order" option!
+            ln = document.createTextNode(args.join(' ')+'\n');
         }
         eOut.append(ln);
-      };
-      const log = (...args)=>{
+    };
+    const log = (...args)=>{
         //console.log(...args);
         log2('', ...args);
-      };
-      const logErr = function(...args){
+    };
+    const logErr = function(...args){
         console.error(...args);
         log2('error', ...args);
-      };
-      const logWarn = function(...args){
+    };
+    const logWarn = function(...args){
         console.warn(...args);
         log2('warning', ...args);
-      };
+    };
 
-      const spacePad = function(str,len=21){
+    const spacePad = function(str,len=21){
         if(str.length===len) return str;
         else if(str.length>len) return str.substr(0,len);
         const a = []; a.length = len - str.length;
         return str+a.join(' ');
-      };
-      // OPTION elements seem to ignore white-space:pre, so do this the hard way...
-      const nbspPad = function(str,len=21){
+    };
+    // OPTION elements seem to ignore white-space:pre, so do this the hard way...
+    const nbspPad = function(str,len=21){
         if(str.length===len) return str;
         else if(str.length>len) return str.substr(0,len);
         const a = []; a.length = len - str.length;
         return str+a.join('&nbsp;');
-      };
+    };
 
-      const W = new Worker("speedtest1-worker.js"+self.location.search);
-      const mPost = function(msgType,payload){
+    const W = new Worker("speedtest1-worker.js"+self.location.search);
+    const mPost = function(msgType,payload){
         W.postMessage({type: msgType, data: payload});
-      };
+    };
 
-      const eFlags = E('#select-flags');
-      const eSelectedFlags = E('#toolbar-selected-flags');
-      const eLinkMainThread = E('#link-main-thread');
-      const eLinkWasmfs = E('#link-wasmfs');
-      const eLinkKvvfs = E('#link-kvvfs');
-      const urlParams = new URL(self.location.href).searchParams;
-      const getSelectedFlags = ()=>{
-          const f = Array.prototype.map.call(eFlags.selectedOptions, (v)=>v.value);
-          [
-              'size', 'vfs'
-          ].forEach(function(k){
-              if(urlParams.has(k)) f.push('--'+k, urlParams.get(k));
-          });
-          return f;
-      };
-      const updateSelectedFlags = function(){
+    const eFlags = E('#select-flags');
+    const eSelectedFlags = E('#toolbar-selected-flags');
+    const eLinkMainThread = E('#link-main-thread');
+    const eLinkWasmfs = E('#link-wasmfs');
+    const eLinkKvvfs = E('#link-kvvfs');
+    const urlParams = new URL(self.location.href).searchParams;
+    const getSelectedFlags = ()=>{
+        const f = Array.prototype.map.call(eFlags.selectedOptions, (v)=>v.value);
+        [
+            'size', 'vfs'
+        ].forEach(function(k){
+            if(urlParams.has(k)) f.push('--'+k, urlParams.get(k));
+        });
+        return f;
+    };
+    const updateSelectedFlags = function(){
         eSelectedFlags.innerText = '';
         const flags = getSelectedFlags();
         flags.forEach(function(f){
-          const e = document.createElement('span');
-          e.innerText = f;
-          eSelectedFlags.appendChild(e);
+            const e = document.createElement('span');
+            e.innerText = f;
+            eSelectedFlags.appendChild(e);
         });
         const rxStripDash = /^(-+)?/;
         const comma = flags.join(',');
@@ -205,9 +205,9 @@
         eLinkWasmfs.href = 'speedtest1-wasmfs.html?flags='+comma;
         eLinkKvvfs.setAttribute('target', 'speedtest1-kvvfs-'+comma);
         eLinkKvvfs.href = 'speedtest1-kvvfs.html?flags='+comma;
-      };
-      eFlags.addEventListener('change', updateSelectedFlags );
-      {
+    };
+    eFlags.addEventListener('change', updateSelectedFlags );
+    {
         const flags = Object.create(null);
         /* TODO? Flags which require values need custom UI
            controls and some of them make little sense here
@@ -259,111 +259,111 @@
         flags["--verify"] = "Run additional verification steps.";
         flags["--without"] = "rowid     Use WITHOUT ROWID where appropriate";
         const preselectedFlags = [
-          '--big-transactions',
-          '--singlethread'
+            '--big-transactions',
+            '--singlethread'
         ];
         if(urlParams.has('flags')){
-          preselectedFlags.push(...urlParams.get('flags').split(','));
+            preselectedFlags.push(...urlParams.get('flags').split(','));
         }
-          if('opfs'!==urlParams.get('vfs')){
-          preselectedFlags.push('--memdb');
+        if('opfs'!==urlParams.get('vfs')){
+            preselectedFlags.push('--memdb');
         }
         Object.keys(flags).sort().forEach(function(f){
-          const opt = document.createElement('option');
-          eFlags.appendChild(opt);
-          const lbl = nbspPad(f)+flags[f];
-          //opt.innerText = lbl;
-          opt.innerHTML = lbl;
-          opt.value = f;
-          if(preselectedFlags.indexOf(f) >= 0) opt.selected = true;
+            const opt = document.createElement('option');
+            eFlags.appendChild(opt);
+            const lbl = nbspPad(f)+flags[f];
+            //opt.innerText = lbl;
+            opt.innerHTML = lbl;
+            opt.value = f;
+            if(preselectedFlags.indexOf(f) >= 0) opt.selected = true;
         });    
         const cbReverseLog = E('#cb-reverse-log-order');
         const lblReverseLog = E('#lbl-reverse-log-order');
         if(cbReverseLog.checked){
-          lblReverseLog.classList.add('warning');
-          eOut.classList.add('reverse');
+            lblReverseLog.classList.add('warning');
+            eOut.classList.add('reverse');
         }
         cbReverseLog.addEventListener('change', function(){
-          if(this.checked){
-            eOut.classList.add('reverse');
-            lblReverseLog.classList.add('warning');
-          }else{
-            eOut.classList.remove('reverse');
-            lblReverseLog.classList.remove('warning');
-          }
+            if(this.checked){
+                eOut.classList.add('reverse');
+                lblReverseLog.classList.add('warning');
+            }else{
+                eOut.classList.remove('reverse');
+                lblReverseLog.classList.remove('warning');
+            }
         }, false);
         updateSelectedFlags();
-      }
-      E('#btn-output-clear').addEventListener('click', ()=>{
+    }
+    E('#btn-output-clear').addEventListener('click', ()=>{
         eOut.innerText = '';
-      });
-      E('#btn-reset-flags').addEventListener('click',()=>{
+    });
+    E('#btn-reset-flags').addEventListener('click',()=>{
         eFlags.value = '';
         updateSelectedFlags();
-      });
-      E('#btn-run').addEventListener('click',function(){
+    });
+    E('#btn-run').addEventListener('click',function(){
         log("Running speedtest1. UI controls will be disabled until it completes.");
         mPost('run', getSelectedFlags());
-      });
+    });
 
-      const eControls = E('#ui-controls');
-      /** Update Emscripten-related UI elements while loading the module. */
-      const updateLoadStatus = function f(text){
+    const eControls = E('#ui-controls');
+    /** Update Emscripten-related UI elements while loading the module. */
+    const updateLoadStatus = function f(text){
         if(!f.last){
-          f.last = { text: '', step: 0 };
-          const E = (cssSelector)=>document.querySelector(cssSelector);
-          f.ui = {
-            status: E('#module-status'),
-            progress: E('#module-progress'),
-            spinner: E('#module-spinner')
-          };
+            f.last = { text: '', step: 0 };
+            const E = (cssSelector)=>document.querySelector(cssSelector);
+            f.ui = {
+                status: E('#module-status'),
+                progress: E('#module-progress'),
+                spinner: E('#module-spinner')
+            };
         }
         if(text === f.last.text) return;
         f.last.text = text;
         if(f.ui.progress){
-          f.ui.progress.value = f.last.step;
-          f.ui.progress.max = f.last.step + 1;
+            f.ui.progress.value = f.last.step;
+            f.ui.progress.max = f.last.step + 1;
         }
         ++f.last.step;
         if(text) {
-          f.ui.status.classList.remove('hidden');
-          f.ui.status.innerText = text;
+            f.ui.status.classList.remove('hidden');
+            f.ui.status.innerText = text;
         }else{
-          if(f.ui.progress){
-            f.ui.progress.remove();
-            f.ui.spinner.remove();
-            delete f.ui.progress;
-            delete f.ui.spinner;
-          }
-          f.ui.status.classList.add('hidden');
+            if(f.ui.progress){
+                f.ui.progress.remove();
+                f.ui.spinner.remove();
+                delete f.ui.progress;
+                delete f.ui.spinner;
+            }
+            f.ui.status.classList.add('hidden');
         }
-      };
+    };
 
-      W.onmessage = function(msg){
+    W.onmessage = function(msg){
         msg = msg.data;
         switch(msg.type){
             case 'ready':
-              log("Worker is ready.");
-              eControls.classList.remove('hidden');
-              break;
+                log("Worker is ready.");
+                eControls.classList.remove('hidden');
+                break;
             case 'stdout': log(msg.data); break;
             case 'stdout': logErr(msg.data); break;
             case 'run-start':
-              eControls.disabled = true;
-              log("Running speedtest1 with argv =",msg.data.join(' '));
-              break;
+                eControls.disabled = true;
+                log("Running speedtest1 with argv =",msg.data.join(' '));
+                break;
             case 'run-end':
-              log("speedtest1 finished.");
-              eControls.disabled = false;
-              // app output is in msg.data
-              break;
+                log("speedtest1 finished.");
+                eControls.disabled = false;
+                // app output is in msg.data
+                break;
             case 'error': logErr(msg.data); break;
             case 'load-status': updateLoadStatus(msg.data); break;
             default:
-              logErr("Unhandled worker message type:",msg);
-              break;
+                logErr("Unhandled worker message type:",msg);
+                break;
         }
-      };
-    })();</script>
+    };
+})();</script>
   </body>
 </html>
diff --git a/ext/wasm/speedtest1-worker.js b/ext/wasm/speedtest1-worker.js
index b697d6925d..78e2db57fb 100644
--- a/ext/wasm/speedtest1-worker.js
+++ b/ext/wasm/speedtest1-worker.js
@@ -8,7 +8,7 @@
   */
   const wasmfsDir = function f(wasmUtil){
     if(undefined !== f._) return f._;
-    const pdir = '/persistent';
+    const pdir = '/opfs';
     if( !self.FileSystemHandle
         || !self.FileSystemDirectoryHandle
         || !self.FileSystemFileHandle){
diff --git a/ext/wasm/speedtest1.html b/ext/wasm/speedtest1.html
index 08195f2b12..6c2853a73a 100644
--- a/ext/wasm/speedtest1.html
+++ b/ext/wasm/speedtest1.html
@@ -39,131 +39,136 @@
     <script src="common/SqliteTestUtil.js"></script>
     <script src="speedtest1.js"></script>
     <script>(function(){
-        /**
-           If this environment contains OPFS, this function initializes it and
-           returns the name of the dir on which OPFS is mounted, else it returns
-           an empty string.
-        */
-        const wasmfsDir = function f(wasmUtil){
-          if(undefined !== f._) return f._;
-          const pdir = '/persistent';
-          if( !self.FileSystemHandle
-              || !self.FileSystemDirectoryHandle
-              || !self.FileSystemFileHandle){
+    /**
+       If this environment contains OPFS, this function initializes it and
+       returns the name of the dir on which OPFS is mounted, else it returns
+       an empty string.
+    */
+    const wasmfsDir = function f(wasmUtil){
+        if(undefined !== f._) return f._;
+        const pdir = '/persistent';
+        if( !self.FileSystemHandle
+            || !self.FileSystemDirectoryHandle
+            || !self.FileSystemFileHandle){
             return f._ = "";
-          }
-          try{
+        }
+        try{
             if(0===wasmUtil.xCallWrapped(
-              'sqlite3_wasm_init_wasmfs', 'i32', ['string'], pdir
+                'sqlite3_wasm_init_wasmfs', 'i32', ['string'], pdir
             )){
-              return f._ = pdir;
+                return f._ = pdir;
             }else{
-              return f._ = "";
+                return f._ = "";
             }
-          }catch(e){
+        }catch(e){
             // sqlite3_wasm_init_wasmfs() is not available
             return f._ = "";
-          }
-        };
-        wasmfsDir._ = undefined;
+        }
+    };
+    wasmfsDir._ = undefined;
 
-        const eOut = document.querySelector('#test-output');
-        const log2 = function(cssClass,...args){
-          const ln = document.createElement('div');
-          if(cssClass) ln.classList.add(cssClass);
-          ln.append(document.createTextNode(args.join(' ')));
-          eOut.append(ln);
-          //this.e.output.lastElementChild.scrollIntoViewIfNeeded();
-        };
-        const logList = [];
-        const dumpLogList = function(){
-          logList.forEach((v)=>log2('',v));
-          logList.length = 0;
-        };
-        /* can't update DOM while speedtest is running unless we run
-           speedtest in a worker thread. */;
-        const log = (...args)=>{
-          console.log(...args);
-          logList.push(args.join(' '));
-        };
-        const logErr = function(...args){
-          console.error(...args);
-          logList.push('ERROR: '+args.join(' '));
-        };
+    const eOut = document.querySelector('#test-output');
+    const log2 = function(cssClass,...args){
+        const ln = document.createElement('div');
+        if(cssClass) ln.classList.add(cssClass);
+        ln.append(document.createTextNode(args.join(' ')));
+        eOut.append(ln);
+        //this.e.output.lastElementChild.scrollIntoViewIfNeeded();
+    };
+    const logList = [];
+    const dumpLogList = function(){
+        logList.forEach((v)=>log2('',v));
+        logList.length = 0;
+    };
+    /* can't update DOM while speedtest is running unless we run
+       speedtest in a worker thread. */;
+    const log = (...args)=>{
+        console.log(...args);
+        logList.push(args.join(' '));
+    };
+    const logErr = function(...args){
+        console.error(...args);
+        logList.push('ERROR: '+args.join(' '));
+    };
 
-        const runTests = function(sqlite3){
-          const capi = sqlite3.capi, wasm = capi.wasm;
-          //console.debug('sqlite3 =',sqlite3);
-          const unlink = wasm.xWrap("sqlite3_wasm_vfs_unlink", "int", ["string"]);
-          const pDir = wasmfsDir(wasm);
-          if(pDir){
+    const runTests = function(sqlite3){
+        const capi = sqlite3.capi, wasm = capi.wasm;
+        //console.debug('sqlite3 =',sqlite3);
+        const unlink = wasm.xWrap("sqlite3_wasm_vfs_unlink", "int", ["string"]);
+        const pDir = wasmfsDir(wasm);
+        if(pDir){
             console.warn("Persistent storage:",pDir);
-          }
-          const scope = wasm.scopedAllocPush();
-          let dbFile = pDir+"/speedtest1.db";
-          const urlParams = self.SqliteTestUtil.processUrlArgs();
-          const argv = ["speedtest1"];
-          if('string'===typeof urlParams.vfs){
-              if(!capi.sqlite3_vfs_find(urlParams.vfs)){
-                  log2('error',"Unknown VFS:",urlParams.vfs);
-                  return;
-              }
-              argv.push("--vfs", urlParams.vfs);
-              log2('',"Using VFS:",urlParams.vfs);
-              if('kvvfs' === urlParams.vfs){
-                  urlParams.size = 2;
-                  dbFile = 'session';
-                  log2('warning',"kvvfs VFS: forcing --size",urlParams.size,
-                       "and filename '"+dbFile+"'.");
-                  capi.sqlite3_web_kvvfs_clear('session');
-              }
-          }
-          [
-              'size'
-          ].forEach(function(k){
-              const v = urlParams[k];
-              if(v) argv.push('--'+k, urlParams[k]);
-          });
-          if(urlParams.flags){
-            argv.push(...(urlParams.flags.split(',')));
-          }else{
-            argv.push(
-              "--singlethread",
-              //"--nomutex",
-              //"--nosync",
-              "--nomemstat"
-            );
-            //"--memdb", // note that memdb trumps the filename arg
-          }
-          argv.push("--big-transactions"/*important for tests 410 and 510!*/,
-                    dbFile);
-          console.log("argv =",argv);
-          // These log messages are not emitted to the UI until after main() returns. Fixing that
-          // requires moving the main() call and related cleanup into a timeout handler.
-          if(pDir) unlink(dbFile);
-          log2('',"Starting native app:\n ",argv.join(' '));
-          log2('',"This will take a while and the browser might warn about the runaway JS.",
-               "Give it time...");
-          logList.length = 0;
-          setTimeout(function(){
-              wasm.xCall('wasm_main', argv.length,
-                         wasm.scopedAllocMainArgv(argv));
-              wasm.scopedAllocPop(scope);
-              if(pDir) unlink(dbFile);
-              logList.unshift("Done running native main(). Output:");
-              dumpLogList();
-          }, 50);
-        }/*runTests()*/;
+        }
+        const scope = wasm.scopedAllocPush();
+        let dbFile = pDir+"/speedtest1.db";
+        const urlParams = new URL(self.location.href).searchParams;
+        const argv = ["speedtest1"];
+        if(urlParams.has('flags')){
+            argv.push(...(urlParams.get('flags').split(',')));
+        }
 
-        self.sqlite3TestModule.print = log;
-        self.sqlite3TestModule.printErr = logErr;
-        sqlite3Speedtest1InitModule(self.sqlite3TestModule)
+        let forceSize = 0;
+        if(urlParams.has('vfs')){
+            const vfs = urlParams.get('vfs');
+            if(!capi.sqlite3_vfs_find(vfs)){
+                log2('error',"Unknown VFS:",vfs);
+                return;
+            }
+            argv.push("--vfs", vfs);
+            log2('',"Using VFS:",vfs);
+            if('kvvfs' === vfs){
+                forceSize = 2;
+                dbFile = 'session';
+                log2('warning',"kvvfs VFS: forcing --size",forceSize,
+                     "and filename '"+dbFile+"'.");
+                capi.sqlite3_web_kvvfs_clear(dbFile);
+            }
+        }
+        if(forceSize){
+            argv.push('--size',forceSize);
+        }else{
+            [
+                'size'
+            ].forEach(function(k){
+                const v = urlParams.get(k);
+                if(v) argv.push('--'+k, urlParams[k]);
+            });
+        }
+        argv.push(
+            "--singlethread",
+            //"--nomutex",
+            //"--nosync",
+            //"--memdb", // note that memdb trumps the filename arg
+            "--nomemstat"
+        );
+        argv.push("--big-transactions"/*important for tests 410 and 510!*/,
+                  dbFile);
+        console.log("argv =",argv);
+        // These log messages are not emitted to the UI until after main() returns. Fixing that
+        // requires moving the main() call and related cleanup into a timeout handler.
+        if(pDir) unlink(dbFile);
+        log2('',"Starting native app:\n ",argv.join(' '));
+        log2('',"This will take a while and the browser might warn about the runaway JS.",
+             "Give it time...");
+        logList.length = 0;
+        setTimeout(function(){
+            wasm.xCall('wasm_main', argv.length,
+                       wasm.scopedAllocMainArgv(argv));
+            wasm.scopedAllocPop(scope);
+            if(pDir) unlink(dbFile);
+            logList.unshift("Done running native main(). Output:");
+            dumpLogList();
+        }, 50);
+    }/*runTests()*/;
+
+    self.sqlite3TestModule.print = log;
+    self.sqlite3TestModule.printErr = logErr;
+    sqlite3Speedtest1InitModule(self.sqlite3TestModule)
         .then((EmscriptenModule)=>{
             return EmscriptenModule.sqlite3.installOpfsVfs()
                 .catch((e)=>{console.warn(e.message)})
                 .then(()=>runTests(EmscriptenModule.sqlite3));
         });
-      })();
-    </script>
-  </body>
+})();</script>
+</body>
 </html>
diff --git a/manifest b/manifest
index 40da9686bf..425e47a2af 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fiddle:\sreplace\sdb\sexport\sroutine\swith\sa\sC-side\sone\swhich\sworks\sfor\sboth\sEmscripten\sFS-hosted\sand\sOPFS-hosted\sdb\sfiles.\sMinor\scode-adjacent\scleanups.
-D 2022-09-26T13:55:10.137
+C wasm/js:\srename\s/persistent\sto\s/opfs\sto\saccount\sfor\spotential\sfuture\spersistent\sstorage\soptions.\sMinor\sflag-handling\scleanups\sin\sthe\sspeedtest1\spages.\sMinor\sAPI\stweaks\sin\soo1.
+D 2022-09-27T09:17:37.806
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -483,39 +483,39 @@ F ext/wasm/api/post-js-footer.js b64319261d920211b8700004d08b956a6c285f3b0bba814
 F ext/wasm/api/post-js-header.js 2e5c886398013ba2af88028ecbced1e4b22dc96a86467f1ecc5ba9e64ef90a8b
 F ext/wasm/api/sqlite3-api-cleanup.js 8564a6077cdcaea9a9f428a019af8a05887f0131e6a2a1e72a7ff1145fadfe77
 F ext/wasm/api/sqlite3-api-glue.js fe5ca21ac519e6411f5e7a6403d06fe92c51ef81cca8e07ea8895df8ec9c2e4e
-F ext/wasm/api/sqlite3-api-oo1.js 455fcb28dd77b9781e087aac77392fb78f8ee8e5b125a99c1488604de27a5bb1
-F ext/wasm/api/sqlite3-api-opfs.js e0dfae09aedc6fe414d8d350e7228a6a88de030a0cb19a748ac8269aef9b11db
-F ext/wasm/api/sqlite3-api-prologue.js d39bda7d83aaeb8e15574afe8308221ed11c6f24865ccff06cf0424b665e681e
+F ext/wasm/api/sqlite3-api-oo1.js 97a786b366fcac442e1557c3eedef3afa96877411bd6239094d4db5fd5b3c353
+F ext/wasm/api/sqlite3-api-opfs.js 1128b3cbfbecbe66324d334f4561ccf61f2b08f73075e6c77a053f7ecb71090f
+F ext/wasm/api/sqlite3-api-prologue.js 0ba5ae19021524e02d977668c6b16e951b4ebe0d5f0ff0577e85f4209284a11a
 F ext/wasm/api/sqlite3-api-worker1.js 2eeb2a24e1a90322d84a9b88a99919b806623de62792436446099c0988f2030b
 F ext/wasm/api/sqlite3-wasi.h 25356084cfe0d40458a902afb465df8c21fc4152c1d0a59b563a3fba59a068f9
-F ext/wasm/api/sqlite3-wasm.c 7010405f1981cd5929568403a618f80398f7acbf76b3eb11c4f23789206eb164
+F ext/wasm/api/sqlite3-wasm.c 1409d76529537c2d21a06678df81a3cb5050e212a5ae4cdd9fb42ca5716c65e9
 F ext/wasm/batch-runner.html 2857a6db7292ac83d1581af865d643fd34235db2df830d10b43b01388c599e04
 F ext/wasm/batch-runner.js 6f5b86e0b5519a9a941d9f17ee9c5ecdc63f452f157602fe7fdf87f6275a2b49
-F ext/wasm/common/SqliteTestUtil.js 529161a624265ba84271a52db58da022649832fa1c71309fb1e02cc037327a2b
+F ext/wasm/common/SqliteTestUtil.js c997c12188c97109f344701a58dd627b9c0f98f32cc6a88413f6171f2191531c
 F ext/wasm/common/emscripten.css 3d253a6fdb8983a2ac983855bfbdd4b6fa1ff267c28d69513dd6ef1f289ada3f
 F ext/wasm/common/testing.css 3a5143699c2b73a85b962271e1a9b3241b30d90e30d895e4f55665e648572962
 F ext/wasm/common/whwasmutil.js 20291bbf4955358d0b5ead58db4c575be269b4976e39c43a93331547e3b86363
 F ext/wasm/demo-123-worker.html e419b66495d209b5211ec64903b4cfb3ca7df20d652b41fcd28bf018a773234f
 F ext/wasm/demo-123.html aa281d33b7eefa755f3122b7b5a18f39a42dc5fb69c8879171bf14b4c37c4ec4
-F ext/wasm/demo-123.js 234655683e35a4543a23de7b10800d76b0369947b33e089e5613171fa7795afb
+F ext/wasm/demo-123.js 9a64c4e535c9d7c8d9a8dd67ca40b42b95baad85049deb84cd447b859e59cc68
 F ext/wasm/demo-kvvfs1.html 7d4f28873de67f51ac18c584b7d920825139866a96049a49c424d6f5a0ea5e7f
 F ext/wasm/demo-kvvfs1.js e884ea35022d772c0d1dd884b40011413696438394f605c6cd4808cfb1642a4a
 F ext/wasm/fiddle.make fd56fa21bada6ecbf860686a9a789ebda7cc3d9b60835927000fcb00246ea50f
 F ext/wasm/fiddle/emscripten.css 3d253a6fdb8983a2ac983855bfbdd4b6fa1ff267c28d69513dd6ef1f289ada3f
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 F ext/wasm/split-speedtest1-script.sh a3e271938d4d14ee49105eb05567c6a69ba4c1f1293583ad5af0cd3a3779e205 x
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 F ext/wasm/sql/001-sudoku.sql 35b7cb7239ba5d5f193bc05ec379bcf66891bce6f2a5b3879f2f78d0917299b5
@@ -2026,8 +2026,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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 U stephan
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 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index d8a4d0f939..3139bd9f92 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-3579a8d6f1f6cd3cd8aad9949536870c5fe7bae8c1778f700dd85d763e266b94
\ No newline at end of file
+4dc972a3656b2a9ec915bfb3f653136560c753ce4024c3f0d0d0c28f66db7a0a
\ No newline at end of file