How to decide wether it is \"large scale text\" or not

Name: Aktionsbuendnis fuer barrierefreie Informationstechnik
Email: kontakt@abi-projekt.de
Affiliation: 
Document: W2
Item Number: Success Criterion 1.4.3
Part of Item: 
Comment Type: question
Summary of Issue: How to decide wether it is \"large scale text\" or not
Comment (Including rationale for any proposed change):
We\'ve got a problem with the definition of \"large scale text\". It\'s described to be \"18 point or 14 point bold\" and explained to be of that size when delivered. So how should I test a page if it meets that SC after delivery than? 

And if every font-size is defined in \"em\" or \"%\" which size in px should I as tester assume to be the 100% size?

Another question is what\'s meant with \"point\" in that case? Do you mean \"pt\" or \"px\"?

Proposed Change:
Would be helpful if there is a clearer definition of what \"large scale text\" means.