It's a pain to format this code since it's in HTML files, but these onclicks should consistent with the normal Cesium formatting.  The body and close brace should be outdented one level (select and shift-tab should do it).  Same throughout the rest of the changed files.


```javascript
        button.onclick = function() {
            scene.getAnimations().removeAll();
            resetExtentPropeties(extent);
            addAlphaAnimation(extent, scene);
            Sandcastle.highlight(addAlphaAnimation);
        };
```