CSS Hyphenated List Attribute Selector E[attr|="value"]
Selects any element with a lang attribute whose value is hypen-seperated list of values.
Definition and Notes.
1. Use this Selector to apply CSS styles to elements where the attribute's value is exactly the same or value immediately followed by a hyphen
2. This selector is generally used for matching languages codes. Eg: a[hreflang|= "en"].
3. 3. Eg: a[hreflang|= "en"] will select elements all elements with hreflang equal to "en" or "en-US" or "en-GB".