diff --git a/ext/fiddle/EXPORTED_FUNCTIONS.fiddle b/ext/fiddle/EXPORTED_FUNCTIONS.fiddle
index 6356910f3b..b96ce4e67c 100644
--- a/ext/fiddle/EXPORTED_FUNCTIONS.fiddle
+++ b/ext/fiddle/EXPORTED_FUNCTIONS.fiddle
@@ -4,3 +4,4 @@ _fiddle_experiment
 _fiddle_the_db
 _fiddle_db_arg
 _fiddle_db_filename
+_fiddle_reset_db
diff --git a/ext/fiddle/fiddle-worker.js b/ext/fiddle/fiddle-worker.js
index 5c7f7e4fbf..302452f1c3 100644
--- a/ext/fiddle/fiddle-worker.js
+++ b/ext/fiddle/fiddle-worker.js
@@ -115,10 +115,10 @@
             stderr("Restarting the app requires reloading the page.");
             wMsg('error', err);
         }
-        fiddleModule.setStatus('Exception thrown, see JavaScript console');
-        fiddleModule.setStatus = function(text) {
+        fiddleModule.setStatus('Exception thrown, see JavaScript console:',text);
+        /*fiddleModule.setStatus = function(text) {
             console.error('[post-exception status]', text);
-        };
+        };*/
     };
 
     const Sqlite3Shell = {
@@ -135,13 +135,13 @@
         exec: function f(sql){
             if(!f._) f._ = fiddleModule.cwrap('fiddle_exec', null, ['string']);
             if(fiddleModule.isDead){
-                wMsg('stderr', "shell module has exit()ed. Cannot run SQL.");
+                stderr("shell module has exit()ed. Cannot run SQL.");
                 return;
             }
             wMsg('working','start');
             try {
                 if(f._running){
-                    wMsg('stderr','Cannot run multiple commands concurrently.');
+                    stderr('Cannot run multiple commands concurrently.');
                 }else{
                     f._running = true;
                     f._(sql);
@@ -151,11 +151,17 @@
                 wMsg('working','end');
             }
         },
+        resetDb: function f(){
+            if(!f._) f._ = fiddleModule.cwrap('fiddle_reset_db', null);
+            stdout("Resetting database.");
+            f._();
+            stdout("Reset",this.dbFilename());
+        },
         /* Interrupt can't work: this Worker is tied up working, so won't get the
            interrupt event which would be needed to perform the interrupt. */
         interrupt: function f(){
             if(!f._) f._ = fiddleModule.cwrap('fiddle_interrupt', null);
-            wMsg('stdout',"Requesting interrupt.");
+            stdout("Requesting interrupt.");
             f._();
         }
     };
@@ -170,6 +176,7 @@
         //console.debug("worker: onmessage.data",ev);
         switch(ev.type){
             case 'shellExec': Sqlite3Shell.exec(ev.data); return;
+            case 'db-reset': Sqlite3Shell.resetDb(); return;
             case 'interrupt': Sqlite3Shell.interrupt(); return;
                 /** Triggers the export of the current db. Fires an
                     event in the form:
@@ -184,7 +191,7 @@
                 */
             case 'db-export': {
                 const fn = Sqlite3Shell.dbFilename();
-                wMsg('stdout',"Exporting",fn+".");
+                stdout("Exporting",fn+".");
                 const fn2 = fn ? fn.split(/[/\\]/).pop() : null;
                 try{
                     if(!fn2) throw new Error("DB appears to be closed.");
@@ -213,7 +220,7 @@
                 }else if(buffer instanceof ArrayBuffer){
                     buffer = new Uint8Array(buffer);
                 }else{
-                    wMsg('stderr',"'open' expects {buffer:Uint8Array} containing an uploaded db.");
+                    stderr("'open' expects {buffer:Uint8Array} containing an uploaded db.");
                     return;
                 }
                 const fn = (
@@ -232,7 +239,7 @@
                 if(oldName !== fn){
                     fiddleModule.FS.unlink(oldName);
                 }
-                wMsg('stdout',"Replaced DB with",fn+".");
+                stdout("Replaced DB with",fn+".");
                 return;
             }
         };
diff --git a/ext/fiddle/fiddle.html b/ext/fiddle/fiddle.html
index d8625cbf64..0bdb22e6f5 100644
--- a/ext/fiddle/fiddle.html
+++ b/ext/fiddle/fiddle.html
@@ -60,9 +60,6 @@
       label[for] {
           cursor: pointer;
       }
-      fieldset {
-          border-radius: 0.5em;
-      }
       .error {
           color: red;
           background-color: yellow;
@@ -73,15 +70,55 @@
           pointer-events: none !important;
           display: none !important;
       }
-      fieldset.options {
-          font-size: 70%;
+      /* Safari supports neither styling of nor event handling on a
+         fieldset legend, so we emulate a fieldset-like widget. */
+      .fieldset {
+          border-radius: 0.5em;
+          border: 1px inset;
+          display: flex;
+          flex-direction: column;
       }
-      fieldset > legend {
+      .fieldset > .legend {
+          position: relative;
+          top: -1.5ex;
           padding: 0 0.5em;
+          font-size: 85%;
+          margin-left: 0.5em;
+          flex: 0 1 auto;
+          align-self: self-start;
+          cursor: pointer;
       }
-      fieldset.options > div {
+      .fieldset.options > div {
           display: flex;
           flex-wrap: wrap;
+          font-size: 70%;
+          margin: 0 0.5em 0.5em 0.5em;
+      }
+      .fieldset > .legend > span {
+          position: relative;
+      }
+      .fieldset > .legend::before {
+          /* Hide the parent element's top border where this
+             element intersects it. */
+          content: ' '; 
+          width: 100%; 
+          height: 100%; 
+          background-color: white
+           /* REALLY want to 'inherit' the color from the fieldset's
+              parent, but inherit leads to a transparent bg, which is
+              exactly what we're trying to avoid here. */;
+          opacity: 1;
+          position: absolute; 
+          top: 0; 
+          left: 0; 
+      }
+      .fieldset > .legend::after {
+          content: " [hide]";
+          position: relative;
+      }
+      .fieldset.collapsed > .legend::after {
+          content: " [show]";
+          position: relative;
       }
       span.labeled-input {
           padding: 0.25em;
@@ -117,6 +154,9 @@
           display: flex;
           flex-direction: column-reverse;
       }
+      #view-split > .fieldset.options {
+          margin-top: 0.5em;
+      }
     </style>
   </head>
   <body>
@@ -141,8 +181,8 @@
     </div>
 
     <div id='view-split' class='app-view initially-hidden'>
-      <fieldset class='options'>
-        <legend>Options</legend>
+      <div class='fieldset options collapsible'>
+        <span class='legend'><span>Options</span></span>
         <div class=''>
           <span class='labeled-input'>
             <input type='checkbox' id='opt-cb-sbs'
@@ -175,16 +215,20 @@
           <span class='labeled-input'>
             <button id='btn-export'>Download DB</button>
           </span>
+          <span class='labeled-input'>
+            <button id='btn-reset'>Reset DB</button>
+          </span>
           <span class='labeled-input'>
             <select id='select-examples'></select>
           </span>
         </div>
-      </fieldset>
+      </div><!-- .fieldset -->
       <div id='main-wrapper' class=''>
         <div class='ta-wrapper input'>
           <textarea id="input"
                     placeholder="Shell input. Ctrl-enter/shift-enter runs it.">
--- Use ctrl-enter or shift-enter to execute SQL
+-- Use ctrl-enter or shift-enter to execute SQL. If only a subset
+-- is currently selected, only that part is executed.
 .nullvalue NULL
 .mode box
 CREATE TABLE t(a,b);
diff --git a/ext/fiddle/fiddle.js b/ext/fiddle/fiddle.js
index ec2cc4a8ef..d2ad7091cd 100644
--- a/ext/fiddle/fiddle.js
+++ b/ext/fiddle/fiddle.js
@@ -119,6 +119,17 @@
         wMsg: function(type,data){
             this.worker.postMessage({type, data});
             return this;
+        },
+        /**
+           Prompts for confirmation and, if accepted, deletes
+           all content and tables in the (transient) database.
+        */
+        resetDb: function(){
+            if(window.confirm("Really destroy all content and tables "
+                              +"in the (transient) db?")){
+                this.wMsg('db-reset');
+            }
+            return this;
         }
     };
 
@@ -196,7 +207,7 @@
         delete this.onSFLoaded;
         // Unhide all elements which start out hidden
         EAll('.initially-hidden').forEach((e)=>e.classList.remove('initially-hidden'));
-        
+        E('#btn-reset').addEventListener('click',()=>SF.resetDb());
         const taInput = E('#input');
         const btnClearIn = E('#btn-clear');
         btnClearIn.addEventListener('click',function(){
@@ -217,8 +228,14 @@
             if(SF.jqTerm) SF.jqTerm.clear();
         },false);
         const btnShellExec = E('#btn-shell-exec');
-        btnShellExec.addEventListener('click',function(){
-            const sql = taInput.value.trim();
+        btnShellExec.addEventListener('click',function(ev){
+            let sql;
+            ev.preventDefault();
+            if(taInput.selectionStart<taInput.selectionEnd){
+                sql = taInput.value.substring(taInput.selectionStart,taInput.selectionEnd).trim();
+            }else{
+                sql = taInput.value.trim();
+            }
             if(sql) SF.dbExec(sql);
         },false);
 
@@ -346,7 +363,6 @@
             });
             a.click();
         });
-
         /**
            Handle load/import of an external db file.
         */
@@ -381,6 +397,15 @@
             r.readAsArrayBuffer(f);
         });
 
+        EAll('.fieldset.collapsible').forEach(function(fs){
+            const legend = E(fs,'span.legend'),
+                  content = EAll(fs,':scope > div');
+            legend.addEventListener('click', function(){
+                fs.classList.toggle('collapsed');
+                content.forEach((d)=>d.classList.toggle('hidden'));
+            }, false);
+        });
+        
         /**
            Given a DOM element, this routine measures its "effective
            height", which is the bounding top/bottom range of this element
@@ -453,19 +478,18 @@
                that height here. Larger than ~95% is too big for
                Firefox on Android, causing the input area to move
                off-screen. */
-            const bcl = document.body.classList;
             const appViews = EAll('.app-view');
+            const elemsToCount = [
+                /* Elements which we need to always count in the
+                   visible body size. */
+                E('body > header'),
+                E('body > footer')
+            ];
             const resized = function f(){
                 if(f.$disabled) return;
                 const wh = window.innerHeight;
                 var ht;
                 var extra = 0;
-                const elemsToCount = [
-                    /* Elements which we need to always count in the
-                       visible body size. */
-                    E('body > header'),
-                    E('body > footer')
-                ];
                 elemsToCount.forEach((e)=>e ? extra += effectiveHeight(e) : false);
                 ht = wh - extra;
                 appViews.forEach(function(e){
diff --git a/manifest b/manifest
index f83067ff4d..987b25f828 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sissues\swith\sALTER\sTABLE\sand\striggers\scontaining\s"UPDATE...FROM"\sstatements.
-D 2022-05-26T19:10:11.700
+C fiddle:\sadded\san\soption\sto\scompletely\swipe/reset\sthe\sdb.\sThe\sOptions\sarea\scan\snow\sbe\stoggled\son/off\svia\stapping\sthe\slabel\sat\sits\stop.\sRunning\sthe\sinput\sSQL\sis\snow\slimited\sto\sthe\sselected\sarea\sif\sany\stext\sis\scurrently\sselected,\sper\ssuggestion\sin\sthe\sforum.
+D 2022-05-27T03:27:10.415
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -55,15 +55,15 @@ F ext/expert/expert1.test 3c642a4e7bbb14f21ddab595436fb465a4733f47a0fe5b2855e1d5
 F ext/expert/sqlite3expert.c 6ca30d73b9ed75bd56d6e0d7f2c962d2affaa72c505458619d0ff5d9cdfac204
 F ext/expert/sqlite3expert.h ca81efc2679a92373a13a3e76a6138d0310e32be53d6c3bfaedabd158ea8969b
 F ext/expert/test_expert.c d56c194b769bdc90cf829a14c9ecbc1edca9c850b837a4d0b13be14095c32a72
-F ext/fiddle/EXPORTED_FUNCTIONS.fiddle 2f7c561af85e6d711fb42f395bc0074b6e6fcf16bc57d495ce4e1c3d0484c5d2
+F ext/fiddle/EXPORTED_FUNCTIONS.fiddle 7fb73f7150ab79d83bb45a67d257553c905c78cd3d693101699243f36c5ae6c3
 F ext/fiddle/EXPORTED_FUNCTIONS.sqlite3-api 540b9dec63a3a62a256e2f030827848a92e9b9d9b6fa5c0188295a4a1c5382cd
 F ext/fiddle/EXPORTED_RUNTIME_METHODS b831017ba67ba993b34a27400cef2f6095bd6789c0fc4eba7e7a251c207be31c
 F ext/fiddle/Makefile de65d04bfb312e94dbd7a0e7d99fb126f0abc1db62f920159c4124b5a42347d8
 F ext/fiddle/SqliteTestUtil.js 559731c3e8e0de330ec7d292e6c1846566408caee6637acc8a119ac338a8781c
 F ext/fiddle/emscripten.css 3d253a6fdb8983a2ac983855bfbdd4b6fa1ff267c28d69513dd6ef1f289ada3f
-F ext/fiddle/fiddle-worker.js 6000da12965319bed53d546f87885a6717a0cd8de0b4832edde7a95e63d1f33e
-F ext/fiddle/fiddle.html 70796dc8a867448b41bc7e2c5fd6b1865ed8010b3abe22ba0678e8915c062e9a
-F ext/fiddle/fiddle.js 45f96ac7f7d6678503568dded46afaa741d841a2464519035636da0fd77aec50
+F ext/fiddle/fiddle-worker.js e3e8c7af2d6d10d915c8d6b5c88bd48587afbfdab7cb76858829c3b83e83a810
+F ext/fiddle/fiddle.html 2d63f820b8b5001ebd0ec0045beef0fed7cbef8e02fd6717b79e9b35050ce2e0
+F ext/fiddle/fiddle.js 700df283e8c6e87519aba6839e1aa99d040b39ea545253cbe79da18e24af256a
 F ext/fiddle/index.md d9c1c308d8074341bc3b11d1d39073cd77754cb3ca9aeb949f23fdd8323d81cf
 F ext/fiddle/sqlite3-api.js 8500698d2163f4a25f8e5e6810ad826487342579d6a321d82b244dbc8e6f6db6
 F ext/fiddle/testing.css 750572dded671d2cf142bbcb27af5542522ac08db128245d0b9fe410aa1d7f2a
@@ -568,7 +568,7 @@ F src/random.c 097dc8b31b8fba5a9aca1697aeb9fd82078ec91be734c16bffda620ced7ab83c
 F src/resolve.c a4eb3c617027fd049b07432f3b942ea7151fa793a332a11a7d0f58c9539e104f
 F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
 F src/select.c a0dca0b4a328826d4713195a2fe305852cd8b1ed876311667b00c64b93a7fe23
-F src/shell.c.in f3e0eb3e817f4d2edaeb12a06b2a0c8b5302fa223d87db68975313b9ce768e03
+F src/shell.c.in b76e681f9e441928d574f21f9473ef615158bbeab1ae49f05ecab9d81730a51d
 F src/sqlite.h.in 172528c287399a34f188154017b7268bf82c6d5b780902e361958d2318c4e37c
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h a988810c9b21c0dc36dc7a62735012339dc76fc7ab448fb0792721d30eacb69d
@@ -1970,8 +1970,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 664a49fa813144b6fa5a7ae3f65af5412f150dd5def261c4d581d706b39f7846
-R 4d839461e9af3d0a5ea1b8ddf72bf796
-U dan
-Z 14299f1b8c4a8b0632845b66e1aabf6a
+P 2fba0d41b781d226915fa2bf888a7bc640c046ce22670ceb53f62a09f3975259
+R d64445d576ad28e1599d65086ff528c2
+U stephan
+Z 4f4eb41f174aae895c1e375e4f35adbf
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 07e5cbd3c4..994a67c07c 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-2fba0d41b781d226915fa2bf888a7bc640c046ce22670ceb53f62a09f3975259
\ No newline at end of file
+d100283e378f2d8e353399848184a4ab8ccf6316218fffc28b90a656cf81c279
\ No newline at end of file
diff --git a/src/shell.c.in b/src/shell.c.in
index 73e430b2f3..b03c96183d 100644
--- a/src/shell.c.in
+++ b/src/shell.c.in
@@ -12627,6 +12627,29 @@ const char * fiddle_db_filename(const char * zDbName){
       : NULL;
 }
 
+/*
+** Closes, unlinks, and reopens the db using its current filename (or
+** the default if the db is currently closed). It is assumed, for
+** purposes of the fiddle build, that the file is in a transient
+** virtual filesystem within the browser.
+*/
+void fiddle_reset_db(void){
+  char *zFilename = 0;
+  if(0==globalDb){
+    shellState.pAuxDb->zDbFilename = "/fiddle.sqlite3";
+  }else{
+    zFilename =
+      sqlite3_mprintf("%s", sqlite3_db_filename(globalDb, "main"));
+    shell_check_oom(zFilename);
+    close_db(globalDb);
+    shellDeleteFile(zFilename);
+    shellState.db = 0;
+    shellState.pAuxDb->zDbFilename = zFilename;
+  }
+  open_db(&shellState, 0);
+  sqlite3_free(zFilename);
+}
+
 /*
 ** Trivial exportable function for emscripten. Needs to be exported using:
 **
@@ -12654,8 +12677,7 @@ void fiddle_exec(const char * zSql){
     puts("WASM shell");
     puts("Enter \".help\" for usage hints.");
     if(once>0){
-      shellState.pAuxDb->zDbFilename = "/fiddle.sqlite3";
-      open_db(&shellState, 0);
+      fiddle_reset_db();
     }
     if(shellState.db){
       printf("Connected to %s.\n", fiddle_db_filename(NULL));