This one falls under odds n’ ends. I dug out this cupboard door to study its panel carving; but shot the mitered mortise & tenon too. I guess it’s really a bit of a bridle joint, more than a proper mortise and tenon. I have only cut this joint for one door, it’s not all that common, but something you do see once in a while in 17th-century English work. Notice that the framing material here is quartered, nice & stable. the panel is fast-grown oak by contrast. This joint really needs the stable material; best done in dry stock. When I did a door this way, I drawbored it just for good measure. I assume that’s the case here too.
I had shown my attempts at this joint back when I discussed the miter gauge. https://pfollansbee.wordpress.com/2009/03/12/miter-squares-then-now/
and now, I can’t resist. here’s two recent shots from the workshop.