Just have a look at this screencast to understand why Live Edit is one of the main productivity-enhancing features for front-end web developers:
You can automatically create Run/Debug Configuration and run Debug Session for any HTML file by clicking Debug file_name item in the file context menu (or in the context menu of the editor when the file is opened). Run/Debug configuration will be created, file will be opened in the browser.
Otherwise, you can create Run/Debug Configuration manually.
By the way, Live Edit also provides a Reload in Browser action. Map it to a hotkey and reload any page in your browser you are working on right from the IDE (including PHP pages or Smarty/Twig templates).
Develop with pleasure!
– JetBrains PhpStorm Team