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Wouldn't it make more sense to use a breakable character of some sort before or after the em dash(es) to allow better display?
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Also --- I may be wrong, but I think support for soft/optional hyphens is somewhat lacking in reader software and devices. I remember trying to use the ­ entity way back when, when I wanted lines to break in certain spots if hyphenation was on, and getting the "missing glyph" display of blank box/question mark when I reviewed it ADE. Maybe things have improved since I tried that.