March 2016
Beginner
838 pages
14h 58m
English
Content preview from Web Developer's Reference GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Pseudo-elements
These are selectors that go beyond what is specified in the document. The selectors select things that may not even be elements in the document. Pseudo-elements are not considered part of a simple selector. This means that you cannot use a pseudo-element as part of the :not() selector. Finally, only one pseudo-element can be present per selector.
Note
Note that all of the pseudo-elements start with a double colon (::). This was introduced in CSS3 to help differentiate between pseudo-classes that have a single colon (:). This is important because in CSS2, pseudo-elements only had the single colon. For the most part, you should use the double colon.
::before and ::after
These are used to insert generated content before or after the selected ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.