Re: [csswg-drafts] [css-inline-3] Define em-top and em-bottom baselines (#5312)

> I think you mean iTop = HorizAxis.ideo and iBottom = HorizAxis.idtp? What is iCentral

i* corresponds to ideographic-* defined in https://drafts.csswg.org/css-inline-3/#baseline-types

> ascent/descent are the ones defined in CSS?

I'm unsure, but I guess so.

> It looks like the definition is similar but slightly modified from OpenType Ideographic Em-Box. Is this intentional?

Yes. jfkthame says particular metric is should be normalized to 1em.

(Please note this is not a metric used for CSS layout. This is just for this particular Canvas API. See https://html.spec.whatwg.org/multipage/canvas.html#dom-textmetrics-fontboundingboxascent )

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Received on Tuesday, 21 July 2020 20:36:20 UTC