AutoGrow Textareas with CSS

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As the demands of the web change and developers experiment with different user experiences, the need for more native language improvements expands. Our presentation layer, CSS, has done incredibly well in improving capabilities, even if sometimes too slow. The need for native support for automatically expanding textarea elements has been long known...and it's finally here!

To allow textarea elements to grow vertically and horizontally, add the field-sizing property with a value of content:

textarea {
  field-sizing: content; // default is `fixed`
}

The default value for field-sizing is fixed, signaling current behavior. The new behavior, content, will expand as much as possible. To constrain the size a textarea can grow, use traditional width/max-width and height/max-height properties.

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Discussion

  1. Michael

    Sorry for asking, but is field-sizing: content; really finally there? At least on my Mac with Google Chrome 120.0.6099.129 in the DevTools it says “unkown property name”, same goes for Safari 16.2 (18614.3.7.1.5) and Firefox 112.0.2 (64-Bit).
    thanks Michael

  2. CSS working ⚒

  3. As of January 2024, this doesn’t work yet in any stable browser.

    Looking at the Chrome status for this feature, it appears that it won’t ship until Chrome 122. (At the time of this writing, latest Chrome is 120.)

    The web standards explainer doc for this gives more details.

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