The :only-of-type CSS pseudo-class represents an element that has no siblings of the same type.
/* Selects each <p>, but only if it is the */
/* only <p> element inside its parent */
p:only-of-type {
  background-color: lime;
}
Note: As originally defined, the selected element had to have a parent. Beginning with Selectors Level 4, this is no longer required.
Syntax
:only-of-type
Example
HTML
<main>
  <div>I am `div` #1.</div>
  <p>I am the only `p` among my siblings.</p>
  <div>I am `div` #2.</div>
  <div>I am `div` #3.
    <i>I am the only `i` child.</i>
    <em>I am `em` #1.</em>
    <em>I am `em` #2.</em>
  </div>
</main>
CSS
main :only-of-type {
  color: red;
}
Result
Specifications
| Specification | Status | Comment | 
|---|---|---|
| Selectors Level 4 The definition of ':only-of-type' in that specification. | Working Draft | Matching elements are not required to have a parent. | 
| Selectors Level 3 The definition of ':only-of-type' in that specification. | Recommendation | Initial definition. | 
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari | 
|---|---|---|---|---|---|---|
| Basic support | 1.0 | (Yes) | 3.5 (1.9.1) | 9.0 | 9.5 | 3.2 | 
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | 
|---|---|---|---|---|---|---|
| Basic support | 2.1 | (Yes) | 1.0 (1.9.1) | 9.0 | 10.0 | 3.2 | 
See also
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                       Last updated by:
                      chrisdavidmills,