Before: According to those docs

According to those docs, they are equivalent: element: before { style properties } /" CSS2 syntax "/ element:: before { style properties } /" CSS3 syntax "/ The only difference is that the double colon is used in CSS3, whereas the single colon is the legacy version. Reasoning: The :: before notation was introduced in CSS 3 in order to establish a discrimination between pseudo-classes and pseudo-elements. Browsers also accept the notation : before introduced in CSS 2. Before definition: previous to; earlier or sooner than.. See examples of BEFORE used in a sentence. Before as an adverb Before , as an adverb, means already, in the past and similar ideas. I have seen that film before . Before can also mean at any time before the past moment that we are talking about. In this case a past perfect tense is used. She realized that she had seen him before . We also use before after a time expression to count back from a past moment. A past perfect tense is normally used. Note that to count back from the present, we use ago, not before . Before as a conjunction The ... The meaning of BEFORE is in advance : ahead. How to use before in a sentence.