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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.
Explains the purpose and functionality of :before and :after pseudo-elements in CSS.
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 ...
Since :before is a pseudo element, you can't have html content, only text.
How to write ::before / ::after inside anchor tag Asked 9 years, 7 months ago Modified 2 years, 11 months ago Viewed 17k times
How to write ::before / ::after inside anchor tag - Stack Overflow
However, all before hooks that apply are executed before any beforeEach hook. This explains the order above: sublevel before executes before top beforeEach because it is a before hook. And with after and afterEach, the same logic applies but the the order is reversed: all afterEach hooks that apply are executed before any after hook.
Everything else is vanilla CSS, ::after, ::before are pseudo elements, .relative and .radio are class selectors, :checked is a pseudo class for input types radio and checkbox, and + is an adjacent sibling selector
