I don't think I can use insertBefore() because I do not know what element will be first in the DOM.
Edit:
I am开发者_如何学运维 trying to insert a body tag (i.e. <body>).
Without using a library, try this:
document.body.insertBefore(document.createElement("div"), document.body.firstChild);
Well, but you can always check this:
If document body has at least one child, use
document.body.insertBefore([the new element], document.body.firstChild)If document body has no children, just use
document.body.appendChild([the new element]).
The first element in the document will be document.body.children[0].
Use prepend() to add an element to the beginning of a container (the body). http://api.jquery.com/prepend/
$('body').prepend()
Use .insertBefore() method
document.body.insertBefore(newNode, document.body.children[0])
document.body.innerHTML = '<body>'+document.body.innerHTML+'</body>';
There. Simply envelops the current HTML with the body tag.
![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif)
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