Before It's Too Late: Recognizing the Early Signs of Hantavirus and Protecting Your Loved Ones. We weren’t able to create a summary for you. Refresh your page to try again. May 23, 2018 · The ::before notation (with two colons) was introduced in CSS3 in order to establish a discrimination between pseudo-classes and pseudo-elements. Browsers also accept the notation … Before It's News is a community of individuals who report on what's going on around them, from all around the world. May 18, 2014 · So I read the docs and probably understand the purpose of ::before and ::after. If my understanding is correct, they should always work in combination with other elements. But the web … Apr 25, 2011 · Hence, a:hover::before and a:visited::before. But if you're developing for legacy browsers such as IE8 and older, then you can get away with using single colons just fine. This specific order of … Back in April, I bit the bullet and ordered the OmniLux red light therapy mask after a few months of research.