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by Flimm 905 days ago
.mhtml (or .mhtm) is that format. It's an archive containing an HTML file along with all the resources it references (JavaScript, CSS, and images). These browsers support it: Internet Explorer, Edge, Opera, Chrome, Yandex, and Vivaldi. Create one by saving the web page and choosing the .mhtml format. Safari supports another format called webarchive.

https://en.wikipedia.org/wiki/MHTML