We have a use case where for theme switch we are using alternative stylesheets, so when our app loads first time it is a normal style sheet with rel="stylesheet" and redrawStylesheet function works fine, but when we switch theme then a new stylesheet is appended with rel="alternate stylesheet" and because of this redrawStylesheet never calls again because only onElement('link[rel="stylesheet"]' is being watched. So alternative stylesheet support also needs to be added in library.