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It means you've tried to insert a DOM node into a place in the DOM tree where it cannot go. The most common place I see this is on Safari which doesn't allow the following:
document.appendChild(document.createElement('div'));
Generally, this is just a mistake where this was actually intended:
document.body.appendChild(document.createElement('div'));
Other causes seen in the wild (summarized from comments):
<!doctype html> to your injected HTML, or specifying the content type when fetching via XHR)If you are getting this error due to a jquery ajax call $.ajax
Then you may need to specify what the dataType is coming back from the server. I have fixed the response a lot using this simple property.
$.ajax({
url: "URL_HERE",
dataType: "html",
success: function(response) {
$('#ELEMENT').html(response);
}
});
Specifically with jQuery you can run into this issue if forget the carets around the html tag when creating elements:
$("#target").append($("div").text("Test"));
Will raise this error because what you meant was
$("#target").append($("<div>").text("Test"));
This error can occur when you try to insert a node into the DOM which is invalid HTML, which can be something as subtle as an incorrect attribute, for example:
// <input> can have a 'type' attribute
var $input = $('<input/>').attr('type', 'text');
$holder.append($input); // OK
// <div> CANNOT have a 'type' attribute
var $div = $('<div></div>').attr('type', 'text');
$holder.append($div); // Error: HIERARCHY_REQUEST_ERR: DOM Exception 3
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