Here is a demo code:
<div id=demo myAttribute=ok></div>
Here are 2 things I want
1) the attribute name, ie: 'myAttribute'.
2) the element that contains the attribute 'myAttribute', ie: the div.
To get a NodeList of Nodes that match a selector
var list = document.querySelectorAll('[myAttribute]');
list will be Array-like but not inherit from Array. You can loop over it with for and list.length
To get a NamedNodeMap of the attributes on an Element
var nnm = elem.attributes;
nnm will be Array-like but not inherit from Array. You can loop over it with for and nnm.length
To get the value of an attribute on an Element use .getAttribute
var val = elem.getAttribute('myAttribute');
val will be null if there is no such attribute
To test the existance of an attribute on an Element use .hasAttribute
var b = elem.hasAttribute('myAttribute');
b will be a Boolean value, true or false
