Surprising interaction of LFE and TUP

default values for both LFE and TUP

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The second link contains ruby, which forces its line to be taller to fit the <rt>.

The height of the first link’s line is not affected by the link’s underline.

This is the expected default behavior.

TUP: from-font;

In this example we just set TUP and haven’t messed with LFE yet. The first link’s underline appears to be a little lower than in the first example, but I don’t think it’s affected the line’s height at all.

LFE: ideographic; TUP: from-font;

Here’s where things get weird. I’ve set both LFE and TUP. The position of the underlines doesn’t appear to be coming from the font anymore, but instead from some data structure affected by LFE. And we see both links affecting the height of the lines they’re in, which is surprising in at least the first case if not both. Also, there’s no longer a reasonable amount of space between the ruby base and ruby text.

the styles applied to the above <figure>s