Why Doesn\'t `width: auto` Work as Expected for `` Elements?

width:auto for Fields

In CSS, width:auto for block-level elements generally means that the width will expand to fill the available space. However, this behavior does not hold true for elements.

What Does width:auto Do for s?

The default size attribute of an element determines its initial width. width:auto merely sets the 's width to the default size.

Achieving the Desired Behavior

To force an to occupy 100% of the available width, use width:100% instead of width:auto. However, this may encounter inconsistencies due to browser variations in border rendering.

Alternative Approach

Another method to fill the available width for s is to remove the size attribute and specify:

<code class="css">input {
  width: 100%;
  margin: -3px;
  border: 2px inset #eee;
}</code>

This approach eliminates the default width and provides consistent behavior across browsers. It subtracts 3 pixels from the margin to offset for the border's width and indent.

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