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Test Info:

<html>
<head>
<meta charset="utf-8"/>
</head>
<body>
<custom-span text="בדיקה"></custom-span>
</body>
<script>
class CustomSpan extends HTMLElement {
constructor() {
super();
var shadow = this.attachShadow({ mode: 'open' });
const span = document.createElement('span');
span.innerText = this.getAttribute('text');
shadow.appendChild(span);
}
}
window.customElements.define('custom-span', CustomSpan);
</script>
</html>