Why Doesn\'t \'display: block\' and \'width: auto\' Stretch Buttons to Fill the Container in Chrome?

Why "display: block" & "width: auto" Doesn't Stretch Buttons to Fill the Container

When applying "display: block" and "width: auto" to a button, you might expect it to stretch and fill the container like other block elements. However, this behavior does not occur in recent versions of Chrome.

Understanding the Behavior

The reason for this behavior lies in the classification of buttons as "replaced elements." Replaced elements, which include input, select, button, img, object, and textarea elements, have specific default display properties.

According to CSS specifications, replaced elements can have intrinsic dimensions determined by external resources, such as images or browser controls. For instance, if an image element has a width set to "auto," it will use the actual width of the linked image file.

Additionally, replaced elements can have visual formatting requirements imposed by the element itself, such as the appearance of user interface controls for form elements, which are beyond the control of CSS.

How This Affects Buttons

Although buttons are not considered pure replaced elements as defined by W3C, they behave similarly in this context. By default, they have intrinsic dimensions based on their content, and "display: block" does not override this behavior.

Solution for Stretching Buttons

If you wish to stretch buttons to fill the container, you can use an alternative approach:

<code class="css">button {
  display: flex;
  width: 100%;
}</code>

Flexbox provides more control over element sizing and allows for elements to be stretched to fill available space.

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