Gets the value of "margin-before"
String get marginBefore => getPropertyValue('margin-before');void marginBefore= (
Sets the value of "margin-before"
set marginBefore(String value) { setProperty('margin-before', value, ''); }
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https://api.dartlang.org/stable/2.0.0/dart-html/CssStyleDeclarationBase/marginBefore.html