code: public String getAttributeValue(final By by, final String attributeName) {
  		WebElement element = findElement(by);
  		return element.getAttribute(attributeName);
  	}
docs: Delegates to {@link #findElement(By)} and then calls
  {@link WebElement#getAttribute(String) getAttribute(String)} on the returned element.
  
  @param by
  the {@link By} used to locate the element
  @param attributeName
  the attribute name
  @return the attribute value