extend method
void extend(Source
void extend(Node node, [int offset]) { if (offset != null) { _blink.BlinkSelection.instance.extend_Callback_2_(this, node, offset); return; } _blink.BlinkSelection.instance.extend_Callback_1_(this, node); return; }
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https://api.dartlang.org/stable/1.24.3/dart-html/Selection/extend.html