Read the class names from the Element class property, and put them into a set (duplicates are discarded). This is intended to be overridden by specific implementations.
Source
Set<String> readClasses() { var classname = _element.attributes['class']; if (classname is AnimatedString) { classname = (classname as AnimatedString).baseVal; } Set<String> s = new LinkedHashSet<String>(); if (classname == null) { return s; } for (String name in classname.split(' ')) { String trimmed = name.trim(); if (!trimmed.isEmpty) { s.add(trimmed); } } return s; }