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The mandatory : could be followed by required whitespace, making :: a syntax error.

Or the whitespace could be strongly recommended, with implementations encouraged to diagnose if it is missing, at least in ambiguous-looking situations like ::hover. (Is that a forgotten space? Or a forgotten colon?)

You have a space in:

    border: 3000px groove purple;
    color: transparent;
So just for consistency, you want it here:

    /*empty prop name*/: ::placeholder {
      color: revert;
    }


Ah this is the problem I originally anticipated with : when I first came up with the idea too. You see the problem is then (if you force a space):

  div {
    color: blue;
    : :hover {
       color: red;
    }
  } /* (1) */
Is unable to represent

  div {
    color: blue;

    /:hover {
      color: purple;
    }
  } /* (2) */
(or if it (1) means (2) then it is unable to represent the A below)

In other words you can write

  <div>Hi<span>there</span></div>
And using the first one get a red there on hover (A). But the second one intends to get a purple Hi there on hover (B). But You can't express that because the mandatory space clashes with the CSS (implicit) descendent combinator (space).




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