What this for?

Hello Lukas,

I am curious as to what purpose this serves in the following method.

any clues?

Keith

-------

WAPierFrame-updateRoot: aHtmlRoot
 
.....most of the method snipped....
 
    "I have no idea what this library thing is?"
   
    (self environment propertyAt: #library ifAbsent: [ ^ self ])
        default updateRoot: aHtmlRoot


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