chromium/third_party/blink/web_tests/external/wpt/css/css-text/text-transform/text-transform-copy-paste-001-manual.html

<!doctype html>
<meta charset=utf-8>
<title>CSS Text 3 test: effects of text-transform on plain text copy&paste</title>
<link rel=author title="Florian Rivoal" href="https://florian.rivoal.net">
<link rel=help href="https://drafts.csswg.org/css-text-3/#text-transform-property">
<meta name=flags content="interact">
<meta name=assert content="text-transform must not affect the content of a plain text copy and paste operation.">
<!--
I wish this test could be written automatedly, but I don't think it can.
We can work around the fact that  document.execCommand(‘copy’) only works when triggered by user interactions
by using test_driver.bless,
but even then there's no way to read the content of the clipboard in an automated way:
* document.execCommand(‘paste’) isn't supported in regular web pages by anyone but IE
* The Clipboard API is not supported across the board,
  and Firefox only supports reading the clipboard in browser extensions,
  not in regular web pages.
-->
<style>
div {
  text-transform: uppercase;
  border: solid 5px blue;
}
textarea { border: solid 5px orange; }
div, textarea { padding: 1em; }
</style>

<p>Copy the content of the blue box, then paste it in the orange box.
<p>The test passes if the result is in lowercase.

<div id=source>there is no need to shout</div>
<textarea></textarea>