wp-calypso/apps/notifications/src/panel/boot/stylesheets/shared/extends.scss

%container {
	&::after {
		content: ".";
		display: block;
		height: 0;
		clear: both;
		visibility: hidden;
	}
}

%ellipsy {
	overflow: hidden;
	text-overflow: ellipsis;
}

%ellipsy-box {
	@extend %ellipsy;
	display: -webkit-box;
	-webkit-box-orient: vertical;
}

%calypso-border {
	border-bottom: 1px solid var(--color-neutral-0);
}