On a Guterberg ebook page it will count the ebook text, excluding the Gutenberg disclaimer and legalese.
If you are on the main ebook page, the results will be appended just below the cover image.
If you are on any of the reading pages, the counter will appear in a fixed box in the top right corner of the window.
On the Gutenberg search results page or the subject page, will append the word count to all search results! (So, if you're looking for a short short story, you don't have to go counting every book that comes up in search.)
Update(2023-04-11): Word/character count will now be displayed in a fixed box in the upper right corner of the window, instead of a pop-up alert. Double click to dismiss. If you select some text, it will count the words in the selection.
NEW(2023-04-14): When in the HTML page of on ebook, click on the chapter heading to get a word count for that chapter.
Words are counted thus: text.trim().split(/--|[\s\*—]+/).length
