Re: a character for an unknown character

From: Marcel Schneider <>
Date: Sat, 31 Dec 2016 22:04:02 +0100 (CET)

On Sat, 31 Dec 2016 11:01:16 +0100, Christoph Päper wrote:
> Richard Wordingham :
> >
> >> Perhaps the letters for hexadecimal digits should have been encoded
> >> separately?
> >
> > The idea has been rejected several times.
> It has indeed. That’s why two different technologies have to be used to get
> typographically harmonic hexadecimal numbers, e.g. in CSS:
> .hex {font-variant-numeric: oldstyle-nums; text-transform: lowercase;}
> .hex {font-variant-numeric: lining-nums; text-transform: uppercase;}
> This works well enough for ‘01ef’ or ‘01EF’, but will fail for conventions like
> ‘0x01ef’ and ‘01EFh’. Hence:
> .hex::before {content: "0x"; text-transform: none;}
> .hex::after {content: "h"; text-transform: none;}
> .hex::after {content: "ₕ";}
> .hex::after {content: "16"; vertical-align: sub; font-size: smaller; line-height: normal;}
> .hex::after {content: "16"; font-variant-position: sub;}
> .hex::after {content: "₁₆";}

Thank you for the code. I didnʼt know this, so Iʼve tried and found that
the automatic prefixes/suffixes cannot be copied from the web page.
That seems to me a disadvantage.

Among the possibilities, you include Unicode subscripts. Is this current
practice? That seems to me very interesting to follow up, as it documents
that the stable representation scheme is already adopted. Iʼm curious to
what extent it is so.

The font-variant-numeric: oldstyle-nums seems not to work with any font.
To get oldstyle numbers and lining numbers both displayed depending on
the active option, I had to add font-family: Constantia, that has oldstyle

I note that the "U+" prefix is missing in the list, obviously because it
denotes more than just a hexadecimal number, and is to be hard-coded.
This is easy when the keyboard includes an emulated numpad with hex letters
and the "U+" as a sequence on a live key. I know that developers appreciate
being able to type hex numbers on a numerical keypad, and consider typing
them on the alphanumerical block, or on both (letters left-hand, digits
right-hand) a suboptimal workaround. Further it is handy to have superscript
and subscript digits accessed on the numpad too.

Received on Sat Dec 31 2016 - 15:04:50 CST

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