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CSS "::" means

I see this use a lot. Especially with pseudo-classes. What does "::" mean in CSS?

.a_demo_three::before {
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From MDN :

Sometimes you will see double colons (: :) instead of one (:). This is part of CSS3 and an attempt to distinguish between pseudo-classes and pseudo-elements. Most browsers support both values.

So, if you want to use pseudo-classes , for example :hover, :first-childetc., use one colon. If you want to use the pseudo-elements , such as ::before, ::after, ::first-letter, etc. Use the double colon.

: W3C , :: , CSS 3, :)

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