Allows focus styles to be applied to elements like buttons and form controls, only when they are focused using the keyboard (e.g. when tabbing between elements), and not when they are focused using a mouse or other pointing device. See <a data-l10n-name="bugzilla">bug 1617600</a> for more details.
Consenti applicar stilos foco a elementos como buttones e controlo de modulo, solo quando illos es eligite per le claviero (e.g. passante inter elementos per le clave de tabulation) e non quando illos es eligite per un mus o altere dispositivo pro punctar. Vide <a data-l10n-name="bugzilla">bug 1617600</a> pro altere detalios.