effectiveBorderTopWidth property
Implementation
@override
CSSLengthValue get effectiveBorderTopWidth =>
    borderTopStyle == CSSBorderStyleType.none ? CSSLengthValue.zero : (_borderTopWidth ?? _mediumWidth);@override
CSSLengthValue get effectiveBorderTopWidth =>
    borderTopStyle == CSSBorderStyleType.none ? CSSLengthValue.zero : (_borderTopWidth ?? _mediumWidth);