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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
addEventListener("load", () => {
const selection = window.getSelection();
const range = selection.getRangeAt(0);
selection.modify("move", "backward", "character");
selection.addRange(range);
});
</script>
</head>
<body>
<fieldset contenteditable spellcheck="true">
<input value="x">
<table>
<caption></caption>
</table>
</fieldset>
</body>
</html>