Leveraging JavaScript to access the margin-top property of the HTML and body tags

I'm having trouble retrieving the "marginTop" style property from the <html> and <body> tags. While Chrome developer tools shows that margin-top is being set via in-HTML CSS:

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

Unfortunately, my attempts to access this property using pure JavaScript have been unsuccessful. When I try code like this:

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

I receive empty strings for both cases.

Although jQuery's offset() function can detect margins correctly, I am unable to use jQuery in this particular scenario. Can someone offer guidance on how to successfully read the top margin property from the html and body elements using only JavaScript?

javascripthtmlcss

Answer №1

If you're looking for a solution, try this out:

const page = document.getElementsByTagName('html')[0];
    const computedStyle = window.getComputedStyle(page);
    const marginTopValue = computedStyle.getPropertyValue('margin-top');

Check out the demo on jsFiddle

Answer №2

Utilizing the document's existing knowledge of the body element, you can retrieve the margin-top property like so:

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

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