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CSS has a property called content. It can only be used with the pseudo elements :after and :before. It is written like a pseudo selector (with the colon), but it's called a pseudo element because it's not actually selecting anything that exists on the page but adding something new to the page.
Understanding the Context
::before insert content before an element using css. What is the ::before or ::after expression, and why is it shown in the ... 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.
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Key Insights
But the web page I'm look... Explains the purpose and functionality of :before and :after pseudo-elements in CSS. You can use the -B and -A to print lines before and after the match. grep -i -B 10 'error' data Will print the 10 lines before the match, including the matching line itself. 56 :before and :after are applied inside a container, which means you can use it for elements with an end tag.
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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. Can I use a :before or :after pseudo-element on an input field? 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.