Why is the text not being entered?

Question

Vue.js

Good afternoon, someone may have encountered such an incomprehensible problem, a vue instance has been created

var app= new Vue({
    el: '#app',
})

On the page

<div id="app">
<input type="text">
</div>

It simply does not allow you to enter values ​​into inputs, you put the cursor, you start typing text, it loses focus and everything, what kind of strange behavior?

Answer 1

If this is all code, vue has nothing to do with it. Some other garbage on the page is to blame. Or some extension of your browser. Or do you hit the touchpad while typing...)