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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-textarea-element/wrap-reflect-1b.html 

<!DOCTYPE html>
<title>Dynamic manipulation of textarea.wrap</title>
<link rel=match href=wrap-reflect-1-ref.html>
<link rel=help href=https://html.spec.whatwg.org/multipage/#dom-textarea-wrap>
<link rel=author title=Ms2ger href=mailto:[email protected]>
<textarea wrap=off cols=20>01234567890 01234567890 01234567890</textarea>
<script>
document.getElementsByTagName("textarea")[0].setAttribute("wrap", "soft");
</script>