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Support the <base>....</base> construction inside the <body> element. That will simplify embedding external HTML code.
For example, one can embed external document without <iframe> tag: <div> <base href="http://www.w3.org/"> <?php echo file_get_contents('http://www.w3.org/standards/'); ?> </base> </div>
This is a feature request - if you want to bring it to HTML please incubate it and get some traction around it at https://discourse.wicg.io first