Update tags, expertise and descriptions across

Fix anything that was a bit out of place

snippets/mouse-cursor-gradient-tracking.md

@@ -1,12 +1,14 @@
 ---
 title: Mouse cursor gradient tracking
-tags: visual, interactivity,advanced
+tags: visual,interactivity,advanced
 ---
 
 A hover effect where the gradient follows the mouse cursor.
 
 ```html
-<button class="mouse-cursor-gradient-tracking"><span>Hover me</span></button>
+<button class="mouse-cursor-gradient-tracking">
+  <span>Hover me</span>
+</button>
 ```
 
 ```css
@@ -63,6 +65,4 @@ btn.onmousemove = function(e) {
 
 #### Browser support
 
-<span class="snippet__support-note">⚠️ Requires JavaScript.</span>
-
 - https://caniuse.com/#feat=css-variables