:only-of-type

Targets an element that is the ONLY child of its type among its siblings. For example, 'the only image' in a div, even if there's also text.

/* Usage Example */
img:only-of-type {
  /* Centers the image if it';s the only image in its container */
  display: block;
  margin: 0 auto;
}
Widely available Since 2015 96% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.

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