CSSStyleDeclaration item() Method

Return the first CSS property name from the style declaration of the "ex1" element:

var style = document.getElementById("ex1").style;
var propname = style.item(0);
alert(propname);

Description

The item() method returns a CSS property name from a CSS declaration block, by index.

The index starts at 0.

Method
item()	Yes	9.0	Yes	Yes	Yes

style.item(index)

Parameter	Description
index	Required. A number representing the index of the CSS property

DOM Version:	CSS Object Model
Return Value:	A String, representing the name of the property

Loop through all the element's style declarations:

for (i = 0; i < elmnt.style.length; i++) {
txt += elmnt.style.item(i)
}