Bind class instance

[DrSensor]

/// counter.js
export default class {
  accessor count = 0
  increment() { this.count++ }
}

<!-- counter.html -->
<render-scope>
  <script type="module" src="counter.js"></script>
  <input type="button" value:="count" onclick:="increment">
</render-scope>

import { page } from "test:counter.html"
const button = page.$("input[type=button]")
assert(button.value === "0")
button.click()
assert(button.value === "1")