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According to the last comment of Web component with "is" attribute not rendered in the view., <textarea v-pre v-model="text" is="my-component"></textarea>
would be
render to <textarea is="my-component">
just as your expectation. However, it seems the issue just fixed Vue 1.x ( Vue 1.0.12 example code ), not Vue 2.x ( your example code ).
So. if you want to set is
attribute in textarea
and make v-model works in Vue 2.x, I thought $refs
is another solution ( Vue 2.x example code by using $refs ).
Source:stackexchange.com