RE hypothetical mitigations, jfkthame suggested drawing a faint red line (or some other sort of indicator) to show the page's printable area, if the margins are set beyond that area. (This would also be a good feature to have e.g. when printing a PDF with "Margins:Default" which may also overshoot the printable area. It would help mitigate stuff like bug 1692926, to clue users in that their PDF's going to get clipped and they may want to intervene & set some custom margins before actually printing.)
Bug 1782268 Comment 1 Edit History
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RE hypothetical mitigations, [jfkthame suggested](https://bugzilla.mozilla.org/show_bug.cgi?id=1681183#c10) drawing a faint red line (or some other sort of indicator) to show the page's printable area, if the margins are set beyond that area. (This would also be a good feature to have e.g. when printing a PDF with "Margins:Default" which may also overshoot the printable area. It would help mitigate stuff like bug 1692926, to clue users in that their PDF's going to get clipped and they may want to intervene & set some custom margins before actually printing.)