File: exportparts-different-scope.html

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<!doctype html>
<meta charset="utf-8">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1854658">
<link rel="match" href="exportparts-different-scope-ref.html">
<style>
my-foo::part(text) { color: green; }
my-bar::part(text) { color: red; background-color: red; }
</style>
<my-foo></my-foo>
<script>
customElements.define('my-foo', class extends HTMLElement {
  constructor(){
    super()
    this.attachShadow({mode: 'closed'}).innerHTML = `
      <my-bar exportparts="text"></my-bar>
    `;
  }
})

customElements.define('my-bar', class extends HTMLElement {
  constructor(){
    super()
    this.attachShadow({mode: 'closed'}).innerHTML = `
      <span part="text">Should be green</span>
    `;
  }
})
</script>