jQuery ^= vs |=. Unnecessary?

Question

jQuery attributeContainsPrefix [name^="value"]

vs

attributeStartsWith [name|="value"]

What the practical difference?

Answer 1

Attribute Contains Prefix Selector in the Manual:

Selects elements that have the specified attribute with a value either equal to a given string or starting with that string followed by a hyphen (-).

This selector was introduced into the CSS specification to handle language attributes.

That means it will match en and en-US but will not match entanglement like the other would. And this is not only good for languages, but anything that can be prefixed.