Re: [csswg-drafts] [css-transitions] Transition to height (or width) "auto" (#626)

From: Axel D. via GitHub <sysbot+gh@w3.org> Date: Mon, 18 May 2020 23:19:48 +0000 To: public-css-archive@w3.org Message-ID: <issue_comment.created-630484457-1589843987-sysbot+gh@w3.org> · This archive was generated by hypermail 2.4.0 : Tuesday, 5 July 2022 06:42:06 UTC

I'd like to add that transitions/animations on `auto` valued properties should also be triggered when content changes:

<hr/>

```html
<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <title>Replaced content transition</title>

  <style type="text/css">
    div
    {
      border: 2px solid #caa;
      background-color: antiquewhite;
      padding: 1em;
      margin: 2em auto;
      width: 80%;

      transition: height 1s;
    }
  </style>
</head>

<body onload="setTimeout(() => document.getElementById('replaceMe').src='b.png', 2000)">
  <div><img id="replaceMe" alt="" src="a.png" /></div>
</body>

</html>
```

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