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chromium/third_party/blink/web_tests/virtual/forced-high-contrast-colors/fast/css/forced-colors-mode/forced-colors-mode-copy-paste-01-expected.html 

<!DOCTYPE html>
<html>
<style>
#destination {
  background-color: green;
  /* this is needed to simulate pasting forced colors into a non-forced colors element */
  forced-color-adjust: none;
}
</style>
<div id="target">Copy this line</div>
<div id="other">some other text</div>

Paste here:
<div id="destination" contenteditable>Copy this line</div>
<script>
// Remove focus so caret is not part of the test image.
document.getElementById('destination').blur();
</script>
</body>
</html>