Fall back on "placeholder" when "placeholder-text" is not used
Fall back on "placeholder" when "placeholder-text" is not used

While "placeholder-text" usage predates aria-placeholder, some user agent
implementors would prefer to expose placeholder text using "placeholder"
because doing so is consistent with the convention used for other ARIA
properties. So check for both.

GNOME/orca,GNOME/orca,GNOME/orca,GNOME/orca