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/Dart 2

dart:html

topLeft property

Point<num> topLeft

Implementation 

Point get topLeft => new Point(this.left, this.top);

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/DomRectReadOnly/topLeft.html