How can i get default font size in pixels by using JavaScript or JQuery?

Question

As you know em is a relative font measurement where one em is equal to the height of the letter \"M\" in the default font size. An advantage in using it is because you will be a

Answer 1

I think this is what you're looking for:

function getDefaultFontSize () {
// this will return the default* value assigned to the style: fontSize
defsize=(document.body.style.fontSize)
alert('The default font size of your browser is: "' + defsize + '"');
}

*If body has a different fontSize decleration anywhere else in the code (perhaps in some css) the function will return that value. For example:

The above will return a fontSize value of 20px.

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Fully tested and works for me (chrome 22.0.1229.94 m and firefox 13.01).