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Calculate em from pixels (snippet pipe)

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*This snippet was originally inspired by [sotetbarna](http://e-texteditor.com/forum/viewtopic.php?p=11786#11786)*

A snippet pipe that will calculate ems based on a given pixel value and base unit.

E.g. If you want a 10px font-size expressed in ems, you would need to perform the following calculation (note 16px is the default base font size in all browsers):

10px / 16px = 0.625em

This snippet allows you to specify the desired pixel size and the base font size and will return the calculated em value.

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Copy this code and paste it in your HTML 
  1. ${0:calculate ${1:10}px in ems with a ${2:16}px base|
  2. ruby -e "print (ENV['TM_TABSTOP_1'].to_f/ENV['TM_TABSTOP_2'].to_f).to_s + 'em'"}

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