E:target

Matches an E element being in the target of the referring URI (Source: W3C)

HTML:

1. <p>Lorem ipsum dolor <a href="#theTarget">sit amet</a>, consectetur</p>
2. <p id="theTarget">Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

CSS:

1. p:target{border:1px dashed red}

Output:

In the example, the second paragraph gets a red dashed border when the link in the first paragraph is clicked.