The lack of replies could indicate that this is, as yet, not possible.
Dreamweaver does have Live View which is a rendering engine based on Chrome. In other words, it is a 'browser' within Dreamweaver that allows you to make the changes that automatically changes the code. You can also change the style rules within Live view, but pre-compiled files (Less/Sass) will not be affected.
Please visit the Dreamweaver forum for more on Dreamweaver.
Thanks so much!
Silly question then. How does something like TinyMCE (or any similar tool) update an HTML file? I mean, you are (basically) updating content in the browser, just in the editor...but it ultimately has to update the html file, no?
You are most likely referring to a CMS (Content Management System) site, where registered users can update the site using the browser. A CMS site is database driven, meaning that the page (HTML) is populated from information contained in a database. When the content is changed (by using the likes of TinyMCE), you are actually changing the data in the database which in turn shows the changed content in the browser.
Have a look at this basic explanation from Simon Meisinger How do CMS work? - Quora