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<!doctype html>
<html>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1" />
<script>
document.addEventListener("DOMContentLoaded", () => {
document
.querySelector("#drop")
.addEventListener("dragover", e => e.preventDefault());
document.querySelector("#drag").addEventListener("dragstart", () => {
if (window.parent != window) {
window.parent?.postMessage("dragstart", "*");
}
});
});
</script>
</head>
<body>
<img
id="drag"
draggable="true"
src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIW2PwmvDoPwAFoAK895OuoAAAAABJRU5ErkJggg=="
width="200"
height="100"
/>
<br />
<div id="drop" style="border: 1px solid red; width: 200px; height: 100px">
drop
</div>
<textarea id="textarea" style="width: 200px; height: 100px"></textarea>
</body>
</html>