convertPointFromNodeToPage and convertPointFromPageToNode are removed. see http://dev.w3.org/csswg/cssom-view/#geometry
static bool get supportsPointConversions => DomPoint.supported;
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/Window/supportsPointConversions.html