File: input-maxlength-emoji.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Tests pasting an emoji in a text field with a maxlength attribute</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://bugs.webkit.org/show_bug.cgi?id=252900">
<input id="target" type="text" maxlength="10" />
<script>
test(function() {
  let target = document.getElementById("target");
  target.focus();
  document.execCommand("InsertHTML", false, "👨‍👩‍👧‍👦");
  assert_equals(target.value, "👨‍👩‍👧‍");
}, "Emoji gets truncated due to maxlength attribute");
</script>