How should other kernels represent parent.document.getElementById.style.height? _html/css_WEB-ITnose

In IE, I can directly use alert(parent.document.getElementById('aa').style.height) to display its height, but it cannot be displayed in a browser using webkit kernel. How does webkit express the above? What about the content? So how does chrome represent it? Thank you!

Reply to discussion (solution)

var value = element.style[style];    if (!value || value === 'auto') {      var css = document.defaultView.getComputedStyle(element, null);      value = css ? css[style] : null;    }

css = document.defaultView.getComputedStyle(element, null);
var mheight = css['height'];

var value = element.style[style];    if (!value || value === 'auto') {      var css = document.defaultView.getComputedStyle(element, null);      value = css ? css[style] : null;    }

css = document.defaultView.getComputedStyle(element, null);
var mheight = css['height '];

Is this supported by all kernels?