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Is there anyway I can incorporate a html combat system into my new game?

Not really. HTML is static, meaning that it never changes. If you wanted to have any type of randomized combat that makes different choices each time it is played, you will have to use some kind of server-side scripting, such as PHP. You could do choose-your-own-adventure style combat where you see an enemy and choose what you want to do, but the results will be the same every time, so it will be more like it is part of the story, rather than combat.