'How can I get the "fallback font-family" with javascript?

I am made a table of chars to test a pixel style font, and the browser shows the fallback font for some characters without char in this pixel style font.

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The firefox devtool inspector shows the exact name of font, but I don't know how to get from javascript.

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The html code is generated with a python script (it is not by hand) and it is this:

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And I was trying with javascript code like this:

window.getComputedStyle(document.getElementById("cell_x000102"),null).getPropertyValue('font-family')
"Telext50"
javascriptcssfont-family


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