Use display: contents on wrapper components

[bengry]

Wrapper components currently either have the default display (inline), or when using setHostDisplay: true, have it be set to whatever the root element is.

This is done because support for display: contents is partial at the moment, with Edge and IE not supporting it at all, and Safari and all Chromium-based browsers having accessibility issues.

This should be further explored, and use CSS.supports() to do use display: contents when available if possible.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.