dom/base/test/chrome/custom_element_ep.js


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/* globals finishTest */
class XFoo extends HTMLElement {
  constructor() {
    super();
    this.magicNumber = 42;
  }

  connectedCallback() {
    finishTest(this.magicNumber === 42);
  }
}
customElements.define("x-foo", XFoo);

document.firstChild.appendChild(document.createElement("x-foo"));