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[css-fonts-4][varfont] Axis values outside of the min/max range defined in the font's fvar should be clamped, not ignored #647

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PeterCon opened this issue Oct 25, 2016 · 3 comments
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[css-fonts-4][varfont] Axis values outside of the min/max range defined in the font's fvar should be clamped, not ignored #647

PeterCon opened this issue Oct 25, 2016 · 3 comments
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@PeterCon
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In section 6.2 of the current CSS 4 Fonts draft, 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 chapter.
@PeterCon PeterCon changed the title [css-fonts-4] [varfont] Axis values outside of the min/max range defined in the font's fvar should be clamped, not ignored [css-fonts-4][varfont] Axis values outside of the min/max range defined in the font's fvar should be clamped, not ignored Oct 25, 2016
@tphinney
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I have difficulty imagining any circumstance in which ignoring the value entirely would be preferable to clamping to the closest available value in the font. I hope the CSS 4 draft is adjusted to be closer to the OpenType spec.

@tabatkins tabatkins added the css-fonts-4 Current Work label Nov 1, 2016
@litherum
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litherum commented Dec 1, 2016

Dup of #517

@litherum litherum closed this as completed Dec 1, 2016
@litherum
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litherum commented Dec 1, 2016

It would be wise to migrate your comments to that thread.

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@tabatkins @litherum @tphinney @PeterCon