List<Rectangle> getClientRects() { var value = _getClientRects(); // If no prototype we need one for the world to hookup to the proper Dart class. var jsProto = JS('', '#.prototype', value); if (jsProto == null) { JS('', '#.prototype = Object.create(null)', value); } applyExtension('DOMRectList', value); return value; }
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https://api.dartlang.org/stable/2.0.0/dart-html/Element/getClientRects.html