Looks at this node and then at parent nodes for a match of the passed simple selector (e.g. div.some-class or span:first-child).
@param selector the simple selector to test
@return the matching element
Method for finding a JSON Object that contains specified field, within this node or its descendants. If no matching field is found in this node or its descendants, returns null.
@param fieldName Name of field to look for
@return Value of first matching node found, if any; null if none
Looks at this node and then at parent nodes for a match of the passed simple selector (e.g. div.some-class or span:first-child).
@param selector the simple selector to test
@return the matching element
Finds the first container parent of this component of the given class.
@param < Z> type of parent
@param c MarkupContainer class to search for
@return First container parent that is an instance of the given class, or null if none can befound
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