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<!DOCTYPE html>
<html>
<head>
<meta charset="utf8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
font-family: system-ui;
-webkit-user-modify: read-write;
margin: 0;
}
div {
width: 300px;
height: 100px;
}
div.drag {
-webkit-user-select: all;
border: 1px solid green;
font-size: 50px;
line-height: 100px;
text-align: center;
}
div.drop {
border: 1px solid tomato;
}
</style>
<script>
addEventListener("load", () => {
document.querySelector(".drop").addEventListener("drop", event => {
document.body.style.webkitUserModify = "read-write-plaintext-only";
document.querySelector("br").remove();
});
getSelection().selectAllChildren(document.querySelector(".drag"));
});
</script>
</head>
<body>
<div class="drag" draggable="true">Drag me</div>
<div class="drop"><br></div>
<p>To run the test manually, drag and drop the selected text into the red box.</p>
</body>
</html>
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