[CSS]combinator(hover)

• :hover +
• :hover ~
• :hover >
• :hover   
• :hover::before
• :hover::after

• ■
• ■

• hover
• https://developer.mozilla.org/en-US/docs/Web/CSS/:hover
• selector
• https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_selectors
• Next-sibling combinator(+)
• https://developer.mozilla.org/en-US/docs/Web/CSS/Next-sibling_combinator
• Child combinator(>)
• https://developer.mozilla.org/en-US/docs/Web/CSS/Child_combinator
• Subsequent sibling combinator(~)
• https://developer.mozilla.org/en-US/docs/Web/CSS/Subsequent-sibling_combinator
• Descendant combinator(" ")
• https://developer.mozilla.org/en-US/docs/Web/CSS/Descendant_combinator