What this for?

Hello Lukas,

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

any clues?

Keith

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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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