> On Dec 1, 2016, at 11:20 AM, Alastair Houghton <alast...@alastairs-place.net> 
> wrote:
> On 1 Dec 2016, at 19:05, Doug Hill <cocoa...@breaqz.com> wrote:
>> Just made another breakthrough. I finally figured out why we have the 
>> vertically centerd colon (I’ll now call it VCC) by default but has 
>> requirements of numbers on either side of the colon.
>> The SF font setting is “Contextual Alternatives” (I’ll now call it CA). When 
>> CA is on, it will use the logic of numbers on either side of a colon to get 
>> VCC. Turning off CA turns off this logic and no VCC. But even if CA is on, 
>> and you have a character stream that isn’t <number>:<number>, you can turn 
>> on VCC explicitly with it’s own selector to get that behavior.
>> Other than VCC I’m not sure what other contextual alternatives there are. 
>> Fractions didn’t seem to do anything differently.
> I think we’ve headed off topic somewhat, so this is likely my final word on 
> the subject.  Contextual alternates’ usual abbreviation is “calt” (which is 
> its OpenType tag).  It might also, at this point, be worth pointing you at 
> the OpenType specification
>  https://www.microsoft.com/en-us/Typography/OpenTypeSpecification.aspx
> and in particular the registered features page:
>  https://www.microsoft.com/typography/otspec/featurelist.htm
> The pages on advanced layout may also be informative.

Thanks for the info!

At this point, I think we figured out the original VCC bug, and I was able to 
document a number of SF font features and how to easily use them. I hope this 
has some value to the developer community; at the very least Google searches 
will now bring up info about these features.
Going forward, I personally hope I don’t have to do a deep dive into the 
OpenType spec everytime I want to use cool features of San Francisco. ;)

Thanks again everyone.

Doug Hil

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