getAttribute is missing?

[atma]

Hi!
I'm trying to get an attribute with Ext.Element.getAttribute('some-attr') but always get undefined.
For example:

var ml  = Ext.fly('ux-element').getAttribute('margin-left');
console.log(ml);

or

var el = Ext.get('ux-element');
var ml = el.getAttribute('margin-left');
console.log(ml);

What I doing wrong?
And another question. Why in Ext core is absent getMargin (like a getPadding or getBorderWidth)?

[atma]

I've been stupid...

el.getStyle('margin-left');