from static method
Implementation
static CSSProvider? from(dynamic provider) {
if (provider == null) return null;
if (provider is CSSProvider) return provider;
if (provider is String) return CSSProvider.fromHTML(provider);
if (provider is UIElement) return CSSProvider.fromElement(provider);
if (provider is UIComponent) return CSSProvider.fromUIComponent(provider);
if (provider is DOMNode) return CSSProvider.fromDOMNode(provider);
return null;
}