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This is a huge pain in any web apps that deals with arbitrary pasting by users, especially in WYSIWYG rich text editors:

One obvious use case is cleaning framework generated html from some random site.

e.g. when you are migrating an old website to a new one - that was when I missed such tool in the past

I suppose it might also be useful for tools that generate very dirty html with tons of span elements. Word used to be that way, or ugh.."Frontpage".