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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 introduced in CSS 2. The :before and :after pseudo-elements inherit any inheritable properties from the element in the document tree to which they are attached. For example, the following rules insert an open quote mark before every Q element. 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 page I'm look... The code marked @Before is executed before each test, while @BeforeClass runs once before the entire test fixture. If your test class has ten tests, @Before code will be executed ten times, but @BeforeClass will be executed only once. In general, you use @BeforeClass when multiple tests need to share the same computationally expensive setup code. Establishing a database connection falls into ... Explains the purpose and functionality of :before and :after pseudo-elements in CSS.
The before and after pseudo-selectors don't insert HTML elements — they insert text before or after the existing content of the targeted element. Because image elements don't contain text or have descendants, neither img:before or img:after will do you any good. This is also the case for elements like <br> and <hr> for the same reason. html - Does :before not work on img elements? - Stack Overflow
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