Why doesn\'t `width: auto` work as expected for `` fields, and how can I make them fill available space?

width:auto Behavior for Fields

Question:

Despite the expectation that width:auto for block-level elements would allow the element to fill available space, it doesn't seem to work this way for elements. Clarify the definition of width:auto and suggest a solution to achieve the desired behavior of filling the available space for fields.

Answer:

The width of an element is calculated based on its size attribute, not the width style property. The default size value determines the initial auto width.

To achieve the expected behavior of filling the available space, try setting width:100% instead of width:auto.

Example:

<code class="html"><form action="" method="post" style="width:200px;background:khaki">
  <input style="width:100%" />
</form></code>

Additional Note:

To further fine-tune the width, add negative margins and borders to cancel out the default margins and borders applied by the browser. This ensures consistency across different browsers, except in Internet Explorer, which applies borders differently.

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