File: picker-and-slotted.html

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<!DOCTYPE html>
<html class=reftest-wait>
<link rel=match href="picker-and-slotted-ref.html">
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Google" href="http://www.google.com/">
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<div id="host">
  <select>
    <option>one</option>
    <option>two</option>
  </select>
</div>

<script>

let host = document.getElementById("host");
let shadow = host.attachShadow({mode: "open"});
shadow.innerHTML = `
  <style>
    #myslot::slotted(select), #myslot::slotted(select)::picker(select) {
      appearance: base-select;
    }
    #myslot::slotted(select)::picker(select) {
      border: thick solid blue;
      background: lime;
      color: maroon;
    }
  </style>
  <slot id="myslot"></slot>
`;


(async () => {
  await test_driver.bless();
  document.querySelector('select').showPicker();
  document.documentElement.classList.remove('reftest-wait');
})();

</script>