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I am going to design a webpage, which contains <div>(s) that allow users to submit their (X)HTML with CSS, and being inserted into those <div>(s). I understand it will suffer from XSS seriously, so I will use HTML Purifier to sanitise the (X)HTML and CSS. For instance, I will definitely not allow <script>, <iframe>, and external resources. But I wish to allow almost all other tags and CSS attributes. Here comes the question. I wish to keep client elements (visually) inside the <div>(s). I have tried a partial solution, by using position: absolute; and overflow: hi