The + combinator separates two selectors and matches the second element only if it immediately follows the first element.
Syntax
former_element + target_element { style properties }
Example
li:first-of-type + li {
  color: red;
}
<ul> <li>One</li> <li>Two</li> <li>Three</li> </ul>
Another use case might be styling of "caption span"s of the following <img> elements:
img + span.caption {
  font-style: italic;
}
will match the following <span> elements:
<img src="photo1.jpg"><span class="caption">The first photo</span> <img src="photo2.jpg"><span class="caption">The second photo</span>
Specifications
| Specification | Status | Comment | 
|---|---|---|
| Selectors Level 4 The definition of 'next-sibling combinator' in that specification. | Working Draft | |
| Selectors Level 3 The definition of 'Adjacent sibling combinator' in that specification. | Recommendation | |
| CSS Level 2 (Revision 1) The definition of 'Adjacent sibling selectors' in that specification. | Recommendation | Initial definition. | 
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari | 
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | 7.0[1] | (Yes) | (Yes) | 
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | 
|---|---|---|---|---|---|---|
| Basic support | 2.1 | (Yes) | (Yes) | ? | (Yes) | (Yes) | 
[1] Internet Explorer 7 doesn't update the style correctly when an element is dynamically placed before an element that matched the selector. In Internet Explorer 8, if an element is inserted dynamically by clicking on a link the first-child style isn't applied until the link loses focus.
See also
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