This is the sort of post that I find myself wanting to click a button and have it indexed into my personal information system, so that I can find it later without hoping that it doesn’t disappear from the Internet or fall off search indices before I need it.
Joplin has a great addon that can clip entire pages into a note (with various options such as convert to md or just plain html). Works great for articles but I imagine anything really JS heavy might fall over, although luckily I've never really had any problems with it myself.
Print to PDF -> put it in a “knowledge base” folder in your home dir -> find it (or anything else) later using full-text search with, e.g. Houdahspot. Simple and durable. I store thousands of articles this way going back years. Search-first interfaces are great.
In lieu of this mythical system, this post on HN.