The include-source property is used in CSS. This property inserts another document into the current document, replacing the current element's content. Any elements or CSS properties applied to or inherited by the current element are applied to the inserted content as well. This property is similar to the HTML <iframe> element in that they both insert another document and its contents into the current document.


Value Description
URL An absolute or relative URL pointing to a document. If rendering of the document is not possible by the browser, it should be ignored and the regular element content be displayed instead. The format used to indicate the URL is url("__");.


body {
     position: absolute;
     top: 100px; 
     left: 300px;
     width: 200px; 
     height: 200px;
     border: thin solid black;
     include-source: url("");

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