Vue does not support IE8 and below, because the Vue uses ECMAScript 5 properties IE8 can not be simulated. But it supports ECMAScript 5 is compatible with all browsers.
In the Vue 2.6.0, Vue is named slots and scope slots introduced a new unified grammar (ie, v-slot instructions), which replaced slot and slot-scope the two have now been abandoned but still not removed and documentation the attribute.
<slot> Bearing element as export distribution of content.