[csswg-drafts] [css-fonts-4] [varfont] Axis values outside of the min/max range defined in the font's fvar should be clamped, not ignored

PeterCon has just created a new issue for 
https://github.com/w3c/csswg-drafts:

== [css-fonts-4] [varfont] Axis values outside of the min/max range 
defined in the font's fvar should be clamped, not ignored ==
In section 6.2 of the current [CSS 4 Fonts 
draft](https://drafts.csswg.org/css-fonts-4/#low-level-font-variation-settings-control-the-font-variation-settings-property),
 it says,

"axis values greater or less than the range supported by the font, are
 ignored and therefore have no effect"

However, the OpenType 1.8 spec gives different guidance to OT 
applications: that values be clamped to the range defined within the 
font. See the normalization algorithm given in the "Coordinate scales 
and normalization" section of the [OpenType Font Variations 
Overview](https://www.microsoft.com/typography/otspec/otvaroverview.htm)
 chapter.

Please view or discuss this issue at 
https://github.com/w3c/csswg-drafts/issues/647 using your GitHub 
account