In viewport class

.in-viewport

.in-viewport-once

.was-in-viewport

.in-viewport

.in-viewport-once

.was-in-viewport

.in-viewport

.in-viewport-once

.was-in-viewport

.in-viewport

.in-viewport-once

.was-in-viewport

.in-viewport

.in-viewport-once

.was-in-viewport

.in-viewport

.in-viewport-once

.was-in-viewport

.in-viewport

.in-viewport-once

.was-in-viewport

.in-viewport

.in-viewport-once

.was-in-viewport

.in-viewport

.in-viewport-once

.was-in-viewport

.in-viewport

.in-viewport-once

.was-in-viewport