All the open attribute to be set on details elements

Hi there. The inclusion of the details and summary element is wonderful, however a key aspect of this element(at least for myself) is being able to set the details element to be open initially, whereas the default is closed.

Currently I imagine that doing so would require some templating/preprocessing of the view or adding some javascript to set the open attribute on the details element, which is not ideal. Please consider adding this as an option in the views interface.