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Thank You. That's a good explanation.
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Is it ok (valid and stable) to have absolute positioned element who has a flexbox container with other items? What are the things that could go wrong?
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Is it ok (valid and stable) to have absolute positioned element who has a flexbox container with other items? What are the things that could go wrong?

Absolute positioned elements

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.

Web Development

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.