Question

What does standard specify about indexing sequence with Attr objects inside NamedNodeMap object?

I am getting reverse sequence in firefox and chrome.

<form action="test.php" method="post" name="test_form" id="test_form">

element = document.getElementById("test_form");
element.attributes.item(0);
element.attributes.item(1);
element.attributes.item(2);
element.attributes.item(3);

Firefox:

id="test_form"
name="test_form"
method="post"
action="test.php"

Chrome:

action="test.php"
method="post"
name="test_form"
id="test_form"

Answer 1

Documentation says:

NamedNodeMaps are not maintained in any particular order. Objects
contained in an object implementing NamedNodeMap may also be accessed
by an ordinal index, but this is simply to allow convenient
enumeration of the contents of a NamedNodeMap, and does not imply that
the DOM specifies an order to these Nodes.

So, not sorted.