stepUp method
void stepUp(Source
void stepUp([int n]) { if (n != null) { _blink.BlinkHTMLInputElement.instance.stepUp_Callback_1_(this, n); return; } _blink.BlinkHTMLInputElement.instance.stepUp_Callback_0_(this); return; }
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https://api.dartlang.org/stable/1.24.3/dart-html/InputElement/stepUp.html