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