How Illustrator calculates the height of box Em?

I am trying to determine how Illustrator calculates the basic position of the top of the a Point text object bounding box.  She seems to be the same distance as an object of text box with the game setting of first base to box Em height line.  I just do not know what assets within the scope of the police which matches.  Help of the Illustrator defines it as:

"The top of the box em in Asian fonts touches the top of the type object. This option is available regardless of the preference show Asian Options. »

For some fonts, this distance seems to be near the pole of the police, but this is not true for each font.  The clues how Illustrator calculates it?

metric-example.png

Here you go

var idoc = app.activeDocument;
var itext = idoc.selection[0];

var top = itext.position[1];
var base = itext.anchor[1];

alert('Em? size: ' + (top-base));

Tags: Illustrator

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