m21 property
num m21Source
@DomName('DOMMatrixReadOnly.m21') @DocsEditable() @Experimental() // untriaged num get m21 => _blink.BlinkDOMMatrixReadOnly.instance.m21_Getter_(this);
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https://api.dartlang.org/stable/1.24.3/dart-html/DomMatrixReadOnly/m21.html