Refreshing the page is what you currently have to do with a typical javascript setup, with the main problem being that you lose all your state on the page. For

Refreshing the page is what you currently have to do with a typical javascript setup, with the main problem being that you lose all your state on the page. For example any form fields you've filled out. With bigger Web apps this can be quite a slow way to develop. WYSIWYG editors are built very specifically to convert to and from from a particular markup to html, they can't process anything outside of that. Clojurescript and React allows me to make changes to part of the DOM and only that part of the page updates, maintaining state on the rest of the page. This is made possible because of React's virtual DOM which can run a diff algorithm and only push through the parts that have changed to the actual DOM.