UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3167.0 Safari/537.36

Steps to reproduce the problem:
With this code:

  <textarea id="x"></textarea>
  <script>
    x.addEventListener('input', function(e) {
      x.textContent = x.value;
    });
  </script>

Type into the textarea.

What is the expected behavior?
Typing should work.

What went wrong?
Focus is immediately lost.

Did this work before? Yes 

Does this work in other browsers? Yes

Chrome version: 62.0.3167.0  Channel: n/a
OS Version: OS X 10.12.6
Flash Version: 


You are probably looking for a change made after 410972 (known good), but no later than 410976 (first known bad).
CHANGELOG URL:
  https://chromium.googlesource.com/chromium/src/+log/0684a6f3db61f973734e654292e00ade79e8bd5d..6ffa8394ec09cac47f842e47f843ad13dc25feb2