server-rendered

[1] vue/packages/vue-server-renderer at dev · vuejs/vue ( (2017-03-23 12:29:05 +09:00)) <https://github.com/vuejs/vue/tree/dev/packages/vue-server-renderer#client-side-hydration>

In server-rendered output, the root element will have the server-rendered="true" attribute. On the client, when you mount a Vue instance to an element with this attribute, it will attempt to "hydrate" the existing DOM instead of creating new DOM nodes.