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You are using syntax valid in Vue 0.12 but are loading Vue 0.11 in the Fiddle. Add this as an external resource to fix it:
https://raw.githubusercontent.com/yyx990803/vue/dev/dist/vue.min.js
- [Vuejs]-Failed to mount component: template or render function not defined while using in another components in Vuejs
- [Vuejs]-Output Checkboxes From Nested Array
Source:stackexchange.com