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- What is the difference between :before and ::before?
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
- How can I write a :hover condition for a:before and a:after?
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 pseudo-classes and pseudo-elements is stated in the spec: One pseudo-element may be appended to the last sequence of simple selectors in a selector
- java - Difference between @Before, @BeforeClass, @BeforeEach and . . .
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
- How do I fetch lines before after the grep result in bash?
The command in the first pipe uses grep to print out all the text that appears a specified number of lines before the matching string, and an additional pipe operator makes grep to output the exact text after the matching string, ignoring the exact text that appears before or after the targeted string, further narrowing down the output
- Can I use a :before or :after pseudo-element on an input field?
55 :before and :after are applied inside a container, which means you can use it for elements with an end tag It doesn't apply for self-closing elements On a side note, elements which are self-closing (such as img hr input) are also known as 'Replaced Elements', as they are replaced with their respective content
- Why use * selector in combination with *::before and *::after
4 ::after and ::before are pseudo elements and they insert the style after or before the element correspondingly For your question with *::after and *::before is used to manage appearing spaces If you don't, the box-sizing is content-box and you'll see the difference (even can't see by our eyes) in spacing
- Flask deprecated before_first_request how to update
I'm learning web development for simple applications and I've created one that uses before_first_request decorator According with the new release notes, the before_first_request is deprecated and
- Can I have multiple :before pseudo-elements for the same element?
In CSS2 1, an element can only have at most one of any kind of pseudo-element at any time (This means an element can have both a :before and an :after pseudo-element — it just cannot have more than one of each kind ) As a result, when you have multiple :before rules matching the same element, they will all cascade and apply to a single :before pseudo-element, as with a normal element In
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