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+<!doctype html>
+<html lang="en-us">
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <link rel="shortcut icon" href="data:image/x-icon;," type="image/x-icon">
+    <link rel="stylesheet" href="../common/emscripten.css"/>
+    <link rel="stylesheet" href="../common/testing.css"/>
+    <title>sqlite3 tester #1: Worker thread</title>
+    <style></style>
+  </head>
+  <body>
+    <h1 id='color-target'>sqlite3 tester #1: Worker thread</h1>
+    <div>Variants:
+      <a href='tester1.html' target='tester1.html'>conventional UI thread</a>,
+      <a href='tester1-worker.html' target='tester1-worker.html'>conventional worker</a>,
+      <a href='tester1-esm.html' target='tester1-esm.html'>ESM in UI thread</a>,
+      <a href='tester1-worker.html?esm' target='tester1-worker.html?esm'>ESM worker</a>
+    </div>
+    <div class='input-wrapper'>
+      <input type='checkbox' id='cb-log-reverse'>
+      <label for='cb-log-reverse'>Reverse log order?</label>
+    </div>
+    <div id='test-output'></div>
+    <script>(function(){
+      const logTarget = document.querySelector('#test-output');
+      const logHtml = function(cssClass,...args){
+        const ln = document.createElement('div');
+        if(cssClass){
+          for(const c of (Array.isArray(cssClass) ? cssClass : [cssClass])){
+            ln.classList.add(c);
+          }
+        }
+        ln.append(document.createTextNode(args.join(' ')));
+        logTarget.append(ln);
+      };
+      const cbReverse = document.querySelector('#cb-log-reverse');
+      const cbReverseIt = ()=>{
+        logTarget.classList[cbReverse.checked ? 'add' : 'remove']('reverse');
+      };
+      cbReverse.addEventListener('change',cbReverseIt,true);
+      cbReverseIt();
+      const urlParams = new URL(self.location.href).searchParams;
+      const workerArgs = [];
+      if(urlParams.has('esm')){
+          logHtml('warning',"Attempting to run an ES6 Worker Module, "+
+                  "which is not supported by all browsers! "+
+                  "e.g. Firefox (as of 2023-05) cannot do this.");
+        workerArgs.push("tester1.mjs",{type:"module"});
+        document.querySelectorAll('title,#color-target').forEach((e)=>{
+          e.innerText = "sqlite3 tester #1: ES6 Worker Module";
+        });
+      }else{
+        workerArgs.push("tester1.js?sqlite3.dir=jswasm");
+      }
+      const w = new Worker(...workerArgs);
+      w.onmessage = function({data}){
+        switch(data.type){
+            case 'log':
+              logHtml(data.payload.cssClass, ...data.payload.args);
+              break;
+            case 'error':
+              logHtml('error', ...data.payload.args);
+              break;
+            case 'test-result':{
+                document.querySelector('#color-target').classList.add(
+                    data.payload.pass ? 'tests-pass' : 'tests-fail'
+                );
+                const e = document.querySelector('title');
+                e.innerText = (
+                    data.payload.pass ? 'PASS' : 'FAIL'
+                ) + ': ' + e.innerText;
+                break;
+            }
+            default:
+              logHtml('error',"Unhandled message:",data.type);
+        };
+      };
+    })();</script>
+  </body>
+</html>