[Erlyaws-list] Deferring adding elements to HEAD

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Is there any way to defer defining a value until later down in the page?

<head>
...stuff needed by content...
</head>
<body>
...content...
</body>

Say body content is created by deeply nested yssi:s, and some of them
require head to include elements. At the point of outputting HEAD
elements one doesnt know it yet, so it needs to be added after the
point.