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    <p>This works for me (Firefox 3.6/4.0 and Chrome 10/11):</p> <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>var observe; if (window.attachEvent) { observe = function (element, event, handler) { element.attachEvent('on'+event, handler); }; } else { observe = function (element, event, handler) { element.addEventListener(event, handler, false); }; } function init () { var text = document.getElementById('text'); function resize () { text.style.height = 'auto'; text.style.height = text.scrollHeight+'px'; } /* 0-timeout to get the already changed text */ function delayedResize () { window.setTimeout(resize, 0); } observe(text, 'change', resize); observe(text, 'cut', delayedResize); observe(text, 'paste', delayedResize); observe(text, 'drop', delayedResize); observe(text, 'keydown', delayedResize); text.focus(); text.select(); resize(); }</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>textarea { border: 0 none white; overflow: hidden; padding: 0; outline: none; background-color: #D0D0D0; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;body onload="init();"&gt; &lt;textarea rows="1" style="height:1em;" id="text"&gt;&lt;/textarea&gt; &lt;/body&gt;</code></pre> </div> </div> </p> <p><em>If you want try it on <a href="http://jsfiddle.net/hmelenok/WM6Gq/">jsfiddle</a></em> It starts with a single line and grows only the exact amount necessary. It is ok for a single <code>textarea</code>, but I wanted to write something where I would have many many many such <code>textarea</code>s (about as much as one would normally have lines in a large text document). In that case it is really slow. (In Firefox it's insanely slow.) So I really would like an approach that uses pure CSS. This would be possible with <code>contenteditable</code>, but I want it to be plaintext-only.</p>
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    1. COThis unfortunately fails in IE8, and since it uses overflow: hidden it leaves IE users with no fallback plan. You could toggle overflow on and off to resolve that, but then the scrollbar loses its mind. If you don't use overflow: hidden the textarea doesn't shrink. Close though!
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    2. CO@ChrisMoschini I changed the code a bit. Does this make it work for you?
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    3. COUsing IE tester the code above even works with IE 5.5. I didn't test with IE 9 because I only have XP installed in my VirtualBox.
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