Bitrix Framework

Transition class v-enter is renamed to v-enter-from and v-leave – to v-leave-from.

Before:

.v-enter {
    opacity: 0;
}
.v-leave {
    opacity: 1;
}

Now:

.v-enter-from {
    opacity: 0;
}
.v-leave-from {
    opacity: 1;
}

Learn more on this change in the migration guide.

Vue 3 handles transitions at the root element in a different format. You can find details in these articles:

• Transition at the root element
• Element group transition in the root element