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<head>
<meta name="viewport" content="width=device-width">
<style>
body {
width: 100%;
height: 100%;
margin: 0;
}
#source, #editor {
width: 100%;
height: 200px;
font-size: 200px;
white-space: nowrap;
}
#source {
overflow: hidden;
}
#editor {
border: black 1px solid;
}
</style>
</head>
<body>
<div contenteditable id="source">Hello world</div>
<textarea contenteditable id="editor"></textarea>
<script>
function postEventType(event) {
webkit.messageHandlers.testHandler.postMessage(event.type);
}
editor.addEventListener("drop", postEventType);
editor.addEventListener("dragenter", postEventType);
editor.addEventListener("dragover", postEventType);
editor.addEventListener("dragleave", postEventType);
editor.addEventListener("dragstart", postEventType);
let text = source.childNodes[0];
getSelection().setBaseAndExtent(text, 0, text, text.data.length);
</script>
</body>
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