Updated FAQ (markdown)

FAQ.md

@@ -5,6 +5,7 @@
 * [OpenSeadragon doesn't work well on mobile devices in portrait orientation](#mobile-portrait)
 * [OpenSeadragon isn't working right in my Vue application](#vue)
 * [Can I use TIFF files in OpenSeadragon?](#tiff)
+* [How can I disable the default key bindings?](#keybindings)
 
 ## Questions and Answers
 
@@ -37,4 +38,16 @@ As of OpenSeadragon release 4.0.0, the technique that `Vue2` uses to observe cha
 OpenSeadragon doesn't support TIFF files directly, but you have a number of options. You could:
 * Convert your TIFF file to one of the formats OpenSeadragon supports, like DZI. There are lots of tools for that at https://openseadragon.github.io/examples/creating-zooming-images/.
 * Use a server that converts the TIFF file on the fly, like https://iipimage.sourceforge.io/.
-* Use the https://github.com/pearcetm/GeoTIFFTileSource plugin.
+* Use the https://github.com/pearcetm/GeoTIFFTileSource plugin.
+
+### <a name="keybindings"></a>How can I disable the default key bindings?
+
+The following code snippet will disable all of the default key bindings. You can edit the list of keys to be more specific depending on your application.
+```
+// suppress default OSD keydown handling for a subset of keys
+viewer.addHandler('canvas-key',event=>{     
+    if(['q', 'w', 'e', 'r', 'a', 's', 'd', 'f'].includes(event.originalEvent.key)){ 
+        event.preventDefaultAction = true;
+    }
+});
+```