* {@inheritDoc}
 *
 * @throws WebDriverException because it may not work against native app UI.
 */
public String getCssValue(String propertyName) throws WebDriverException {
    return super.getCssValue(propertyName);
}

/**
 * Get the value of a given CSS property.
 * Color values should be returned as rgba strings, so,
 * for example if the "background-color" property is set as "green" in the
 * HTML source, the returned value will be "rgba(0, 255, 0, 1)".
 *
 * Note that shorthand CSS properties (e.g. background, font, border, border-top, margin,
 * margin-top, padding, padding-top, list-style, outline, pause, cue) are not returned,
 * in accordance with the
 * <a href="http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSStyleDeclaration">DOM CSS2 specification</a>
 * - you should directly access the longhand properties (e.g. background-color) to access the
 * desired values.
 *
 * @param propertyName the css property name of the element
 * @return The current, computed value of the property.
 */
String getCssValue(String propertyName);