When loading the fragments into the diff viewer page, we used `innerHTML` in order to gain a slight performance boost. When using rendered review UI content for binary files, the contents often contain `<script>` tags, and just setting `innerHTML` doesn't work for this. JQuery's `$.html()` method checks for these and changes its behavior to do the right thing. Testing Done: - Ran js-tests. - Added a file attachment for an image file in a diff. Saw that the image review UI was rendered into the diff entry for that file.