Having trouble with the flexbox flex-direction: column property not functioning properly with the textarea element in Firefox?

Inconsistencies between Chrome and Firefox have been noticed in the following example.

While the footer height is set to height:40px and appears fine in Chrome, it seems smaller in Firefox, around 35px. Any specific reasons for this difference?

Link to the Example

<div class="container">
  <div class="textarea">
    <textarea placeholder="textarea ..."></textarea>
  </div>
  <div class="footer">
    #footer
  </div>
</div>

.container{
  display:flex;
  height:100px;
  background-color:whitesmoke;
  flex-direction:column;
}

.textarea{
  flex-grow:1;
  display:flex;
}

.footer{
  background-color:lightseagreen;
  height:40px;
  color:white;
}

textarea{
   flex-grow: 1;
   border: none;
   resize: none;
   padding: 5px;
   font-size: 16px;
   margin: 0px;
   display: block;
}

Answer №1

Firefox and Chrome display the textarea differently, causing a lack of space for the footer.

This variation is due to the predefined size of form elements, which may vary between browsers.

As Firefox adjusts the flex items to fit their parent container, the non-flex item <textarea> cannot shrink beyond its content size within the .textarea div, leading to the shrinking of the footer.


Adding flex-shrink: 0 to the footer prevents it from shrinking, ensuring consistent height across browsers.

To confirm this, changing attributes like padding: 5px to padding: 0 will equalize the footer heights in both browsers.

See below for the structure:

.container{
  display:flex;
  height:100px;
  background-color:whitesmoke;
  flex-direction:column;
}

.textarea{
  flex-grow:1;
  display:flex;
}

.footer{
  background-color:lightseagreen;
  height:40px;
  color:white;
  flex-shrink: 0;                  /*  added  */
}

textarea{
   flex-grow: 1;
   border: none;
   resize: none;
   padding: 5px;
   font-size: 16px;
   margin: 0px;
   display: block;
}
<div class="container">
  <div class="textarea">
    <textarea placeholder="textarea ..."></textarea>
  </div>
  <div class="footer">
    #footer
  </div>
</div>

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