String value,
String priority ) throws DOMException {
try {
InputSource is = new InputSource(new StringReader(value));
CSSOMParser parser = new CSSOMParser();
CSSValue expr = parser.parsePropertyValue(is);
Property p = this.getPropertyDeclaration(propertyName);
boolean important = (priority != null)
? priority.equalsIgnoreCase("important")
: false;
if (p == null) {