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