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<!DOCTYPE html>
<link rel="help" href="text-autospace-dynamic-text-001-ref.html">
<div id="target">国国国国国</div>
<script>
const target_text = document.getElementById('target').firstChild;
document.body.offsetTop; // Force layout.
target_text.replaceData(2, 1, 'AA国国AA');
</script>