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