Since the commit 778734a, vue will always complain that fragment should not contain multiple attributes. However, I think the following props (for components) should not be warned:

• slot
• component props
• event bindings

Consider the following example, slot, @custom-change, :prop should be passed, and :not-prop should be warned. The v-bind is a complexed case, because the object may contain some props and some attributes for element and dynamic:(.

<root>
  <child slot="child" @custom-change="onchange" :prop="prop" :not-prop v-bind="mixedWithSomeProps"></child>
</root>

<template id="child">
  <inner-comp>
    <!-- something -->
  </inner-comp>
</template>