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I'm trying to read "marginTop" style property from the <html> and <body> tags. Chrome developer tools shows margin-top as set via in-HTML CSS:

<style type="text/css" media="screen">
html { margin-top: 28px !important; }
* html body { margin-top: 28px !important; }
</style>

However, when I try something like this:

console.debug(document.getElementsByTagName('html')[0].style.marginTop);
console.debug(document.getElementsByTagName('body')[0].style.marginTop);

I get empty strings in both cases.

jQuery's offset() function detects margins correctly. Unfortunately, I cannot use jQuery in this case, it has to be pure JavaScript.

I would appreciate if someone could provide some insight on how I can read top margin property off the html and body elements.

I'm trying to read "marginTop" style property from the <html> and <body> tags. Chrome developer tools shows margin-top as set via in-HTML CSS:

<style type="text/css" media="screen">
html { margin-top: 28px !important; }
* html body { margin-top: 28px !important; }
</style>

However, when I try something like this:

console.debug(document.getElementsByTagName('html')[0].style.marginTop);
console.debug(document.getElementsByTagName('body')[0].style.marginTop);

I get empty strings in both cases.

jQuery's offset() function detects margins correctly. Unfortunately, I cannot use jQuery in this case, it has to be pure JavaScript.

I would appreciate if someone could provide some insight on how I can read top margin property off the html and body elements.

  • javascript
  • html
  • css
Share Improve this question edited Jan 2, 2013 at 11:47 Jan Hančič 53.9k17 gold badges98 silver badges101 bronze badges asked Jan 2, 2013 at 11:45 martynasmamartynasma 8,5952 gold badges32 silver badges47 bronze badges 2
  • 3 why are you unable to use jquery in this instance? You can always look into jquery method of geting margins. Somewhere in its system it grabs the properties – ProfileTwist Commented Jan 2, 2013 at 11:47
  • It's an addon library. I don't have any control over environments it will be used in. It does not rely on jQuery and it would be silly to add it to requirements just for this. – martynasma Commented Jan 2, 2013 at 12:02
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2 Answers 2

Reset to default 10

You can solve it with:

var element = document.getElementsByTagName('html')[0],
    style = window.getComputedStyle(element),
    marginTop = style.getPropertyValue('margin-top');

jsFiddle

The document already has knowledge about body element, so: 

window.getComputedStyle(document.body).getPropertyValue('margin-top');

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