Add examples of disabled tooltip and popover triggers

docs/4.0/components/popovers.md

@@ -111,6 +111,17 @@ $('.popover-dismiss').popover({
 })
 {% endhighlight %}
 
+### Disabled elements
+
+Elements with the `disabled` attribute aren't interactive, meaning users cannot hover or click them to trigger a popover (or tooltip). As a workaround, you'll want to trigger the popover from a wrapper `<div>` or `<span>` and override the `pointer-events` on the disabled element.
+
+For disabled popover triggers, you may also prefer `data-trigger="hover"` so that the popover appears as immediate visual feedback to your users as they may not expect to _click_ on a disabled element.
+
+{% example html %}
+<span class="d-inline-block" data-toggle="popover" data-content="Disabled popover">
+  <button class="btn btn-primary" style="pointer-events: none;" type="button" disabled>Disabled button</button>
+</span>
+{% endexample %}
 
 ## Usage