adding tabindex to make hover effect accessible by keyboard

Author: chrisdavidmills

index.html

@@ -46,7 +46,7 @@ <h2 id="none">object-fit: none</h2>
 
     <p>Combining <code>object-fit</code> and <code>object-position</code> with CSS transitions can lead to some pretty interesting effects for image or video galleries.</p>
 
-    <img src="flowers.jpg" class="none" alt="when hovered over the image element expands to reveal more of the image">
+    <img src="flowers.jpg" class="none" alt="when hovered over the image element expands to reveal more of the image" tabindex="0">
 
     <h2 id="position">object-position</h2>