this is not as easy as porting a website, there are functions that wouldn't work necessary in html5, if it was that easy half of the old internet wasn't "dying", however flash content will not be supported nor run in browser BUT it can be run, the online games will prob require a "mini-client" and the offline ones (such as old flash games) will require a flash player, a literal player for flash content and you can download straight from adobe such player and there are other projects to preserve such internet history piece

now... no HTML5 i don't see oasis "porting" (aka half of it is re-coding) the game unless something happens or unless CN version converts it and give oasis the source code

is not about changing mind, im not here to try to change noone's mind, im here to inform, what are you asking is something like, have a game written in unity engine and "copy-paste" it in unreal engine, they both game engines but one have some functions other doesn't, one have some things defined with one name the other with other names and so on, it's not hard but it's a metric-ton of work

not sure how to explain it more simpler