Why Does My Container Overflow with Inline-Block Elements Despite `border-box` Sizing?

Understanding Container Overflow with Inline-Block Elements

In the provided HTML and CSS code snippet, the issue arises from the use of inline-block elements within a container. By default, inline-block elements are rendered with additional whitespace in certain browsers.

Source of Whitespace

This whitespace originates from the inline characteristics of inline-block elements. Just as spaces and line breaks in text elements create visible spaces, so do they in inline-block elements. As a result, even though border-box sizing is applied, the container's overflow occurs due to the unexpected width introduced by this whitespace.

Solution: Removing Whitespace

To resolve this overflow issue, it is necessary to remove all whitespace between the inline-block elements in the source code. By doing so, the browser will render the elements without any additional spacing, ensuring that they fit neatly within the container.

Revised Code Snippet:

.ok {
  width: 300px;
  background: red;
  height: 100px;
  box-sizing: border-box;
}
.box {
  display: inline-block;
  box-sizing: border-box;
  width: 25%;
  border: 2px solid blue;
  height: 100%;
}

<div>

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