Baseline Widely available
The DocumentType.before() method inserts a set of Node objects or strings in the children list of the DocumentType's parent, just before the DocumentType. Strings are inserted as equivalent Text nodes.
before(param1)
before(param1, param2)
before(param1, param2, /* â¦, */ paramN)
param1, â¦, paramN
A set of Node objects or strings to insert.
None (undefined).
HierarchyRequestError DOMException
Thrown when the node cannot be inserted at the specified point in the hierarchy.
Comment nodes are valid before doctype declarations but not advisable given they trigger quirks mode in IE. A conditional comment works for IE as well, though:
let docType = document.implementation.createDocumentType("html", "", "");
let myDoc = document.implementation.createDocument("", "", docType);
docType.before(
document.createComment("<!--[if !IE]> conditional comment <![endif]-->"),
);
myDoc.childNodes;
// NodeList [<!--[if !IE]> conditional comment <![endif]-->, <!DOCTYPE html>]
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