public boolean isDiscardElement(String name) {
        return DISCARDABLE_ELEMENTS.contains(name);
    }
Normalizes an attribute name. Assumes that the element name
is valid and normalized
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-html-module/src/main/java/org/apache/tika/parser/html/DefaultHtmlMapper.java