diff --git a/common/core/web/keyboard-processor/src/keyboards/keyboard.ts b/common/core/web/keyboard-processor/src/keyboards/keyboard.ts
index 9d3a41390d..bedfadfb00 100644
--- a/common/core/web/keyboard-processor/src/keyboards/keyboard.ts
+++ b/common/core/web/keyboard-processor/src/keyboards/keyboard.ts
@@ -107,6 +107,12 @@ namespace com.keyman.keyboards {
       return this.scriptObject['KH'];
     }
 
+    /**
+     * Embedded JS script designed for use with a keyboard's HTML help text.  Always defined
+     * within the file referenced by &kmw_embedjs in a keyboard's source, though that file
+     * may also contain _other_ script definitions as well.  (`KHF` must be explicitly defined
+     * within that file.)
+     */
     get hasScript(): boolean {
       return !!this.scriptObject['KHF'];
     }
diff --git a/web/source/kmwembedded.ts b/web/source/kmwembedded.ts
index 4561262059..ba1a60f63e 100644
--- a/web/source/kmwembedded.ts
+++ b/web/source/kmwembedded.ts
@@ -256,7 +256,7 @@ namespace com.keyman.text {
    */
   keymanweb['correctOSKTextSize']=function() {
     let osk: com.keyman.osk.OSKManager = keymanweb.osk;
-    if(osk && osk.vkbd && osk.vkbd.adjustHeights(osk.getKeyboardHeight())) {
+    if(osk?.vkbd?.adjustHeights(osk.getKeyboardHeight())) {
       var b: HTMLElement = osk._Box, bs=b.style;
       bs.height=bs.maxHeight=osk.vkbd.computedAdjustedOskHeight(osk.getHeight())+'px';
 
diff --git a/web/source/osk/oskManager.ts b/web/source/osk/oskManager.ts
index 6b7915a605..60d5004712 100644
--- a/web/source/osk/oskManager.ts
+++ b/web/source/osk/oskManager.ts
@@ -198,7 +198,7 @@ namespace com.keyman.osk {
       } else {
         this.vkbd.adjustHeights(this.getKeyboardHeight());
 
-        var b: HTMLElement = this._Box, bs=b.style;
+        let b: HTMLElement = this._Box, bs=b.style;
         bs.height=bs.maxHeight=this.vkbd.computedAdjustedOskHeight(this.getHeight())+'px';
       }
 
@@ -212,7 +212,7 @@ namespace com.keyman.osk {
         kbdID = kbdID.substring(kbdID.indexOf('::') + 2);
       }
 
-      var kbdClassSuffix = ' kmw-keyboard-' + kbdID;
+      const kbdClassSuffix = ' kmw-keyboard-' + kbdID;
       kbdView.element.className = kbdView.element.className + kbdClassSuffix;
 
       this.banner.appendStyles();
diff --git a/web/source/osk/visualKeyboard.ts b/web/source/osk/visualKeyboard.ts
index 788135ce27..306f4cb1b8 100644
--- a/web/source/osk/visualKeyboard.ts
+++ b/web/source/osk/visualKeyboard.ts
@@ -1536,7 +1536,7 @@ namespace com.keyman.osk {
      *  @param  {Object}            PKbd            the keyboard object to be displayed
      *  @param  {string=}           argFormFactor   layout form factor, defaulting to 'desktop'
      *  @param  {(string|number)=}  argLayerId      name or index of layer to show, defaulting to 'default'
-     *  @param  {Object}            height          Target height for the rendered keyboard 
+     *  @param  {number}            height          Target height for the rendered keyboard 
      *                                              (currently required for legacy reasons)
      *  @return {Object}                            DIV object with filled keyboard layer content
      */