I use sigil to create epub, then convert them to azw3 with calibre.
On my browser (Vivaldi) there's an option to display only the article content (I.e. not show the heads, menus, etc.) I save all the pages I want to read in a same folder, then use sigil to create an epub. It can even create a table of contents, and you can add a cover.
I do this with short stories freely available online. If you are interested in very short articles, it might be too much overhead, but I find this really convenient.
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