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documentOffset property
Provides the coordinates of the element relative to the top of the document.
This method is the Dart equivalent to jQuery's offset method.
Implementation
Point get documentOffset => offsetTo(document.documentElement!);
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Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-html/Element/documentOffset.html