Hyperlinks are traditionally red when being clicked
Red links (at least in wikipedia) link to something that does not exist.
Yes but that's Wikipedia's custom CSS, websites can just redefine the color. Since the other colors are default, in the bottom left panel, the color should be #FF0000 for an active link (for the usually short time of being clicked – mouse held down).
Hyperlinks are traditionally red when being clicked
Red links (at least in wikipedia) link to something that does not exist.
Yes but that's Wikipedia's custom CSS, websites can just redefine the color. Since the other colors are default, in the bottom left panel, the color should be #FF0000 for an active link (for the usually short time of being clicked – mouse held down).
https://stackoverflow.com/questions/4774022/whats-default-html-css-link-color
That is, the HTML standard effectively includes this CSS that is internal to any compliant browser: