add browser support for custom-variables and build

index.html

@@ -343,7 +343,7 @@ in any specification.</span></p>
             <h4 data-type="Browser support">Browser support</h4>
             <div>
               <div class="snippet__browser-support">
-                100%
+                87.2%
               </div>
             </div>
             <p><span class="snippet__support-note">⚠️ This is an experimental technology.</span></p>
@@ -352,7 +352,7 @@ in any specification.</span></p>
 If no link is provided, it defaults to 99+%. -->
             <ul>
               <li>
-                <a href="https://caniuse.com/#feat=some-feature" target="_blank">https://caniuse.com/#feat=some-feature</a>
+                <a href="https://caniuse.com/#feat=css-variables" target="_blank">https://caniuse.com/#feat=css-variables</a>
               </li>
             </ul>
           </div>