Yes. If your player is using firmware version 4.7.106 or later, you can display a full-screen HTML page without having to publish with BrightAuthor or write a custom script. Simply place the index.html file (along with related content files and folders) in the root folder of the SD card.
The player will use a default system font to display text, but you can use custom fonts by adding True Type Font (.ttf) files to the directory of the SD card as well.
Because there is no presentation sync spec, publishing options are limited to Standalone (i.e. writing to the card and physically inserting it into the player). It is also possible to publish HTML files to the player remotely using the SD tab of the player’s Diagnostic Web Server.