writeClasses method
void writeClasses(Join all the elements of a set into one string and write back to the element. This is intended to be overridden by specific implementations.
Source
void writeClasses(Set s) { _element.setAttribute('class', s.join(' ')); }
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https://api.dartlang.org/stable/1.24.3/dart-svg/AttributeClassSet/writeClasses.html