add iterations input (default 5, min 5 for submit)

index.html

@@ -44,6 +44,11 @@
   </section>
 
   <section class="controls">
+    <label class="iterations-control">
+      Iterations per variant:
+      <input type="number" id="iterations-input" value="5" min="1" max="50" step="1">
+      <span class="filter-hint">min 5 to submit</span>
+    </label>
     <button id="btn-download" disabled>Download selected</button>
     <button id="btn-run" disabled>Run benchmarks</button>
     <button id="btn-abort" class="danger" disabled>Abort</button>