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Just use JavaScript to clear the browser history. Bingo! Pure CSS modal.

I see what you did there.

To be fair in some cases this can be a benefit. There have been occasions where I have wanted to link to content contained within a modal. You are right in that there are also occasions where this isn't desired.

Modal can be used with checkbox - and it's sweet: https://codepen.io/Idered/pen/vytkH

Well, you can manipulate the browser history to remove those anchor links :)

... but perhaps not with CSS...

With CSS?

It's just easier to do this with Javascipt without hacking the history.

Sure, just have the user follow a step-by-step guide on deleting the last x items in their history every time ;-)