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This change separates the steps for checking the string value of the ARIA “role” attribute out from the element.role_or_default() function into a separate function — in order to expose a way to just check if the ARIA “role” attribute actually has a value, without also then computing a default role value if no “role” attribute value was found. Otherwise, without this change, the only available function for retrieving ARIA role values is the element.role_or_default() function — which always does the additional step of computing (and returning) a default role value if no “role” attribute is found.