How Can I Get the Rendered Font of an Element Without CSS Font Definitions in JavaScript?

Retrieving the Actual Rendered Font in the Absence of CSS Definitions

Within the realm of JavaScript, developers often encounter the need to ascertain the actual font used to render a specific element, even when font-related attributes are not explicitly defined in the CSS. This challenge arises when the system or web browser employs default font settings for rendering.

Solution:

To uncover the hidden font, developers can leverage the getComputedStyle function, which extracts the computed style of an element. By feeding in the desired property as an argument, one can obtain the rendered value, including font family and size. Here's a custom function that simplifies the process:

function css(element, property) {
    return window.getComputedStyle(element, null).getPropertyValue(property);
}

Usage:

To retrieve the font size, for instance, simply invoke the function thus:

css(object, 'font-size'); // returns '16px', assuming that's the rendered size

Important Notes:

• This method is not supported in Internet Explorer 8.
• The function returns a string, so subsequent processing may be required to extract specific information such as font family or size.

Live Demonstration:

For a practical example, visit the live demo at http://jsfiddle.net/4mxzE/. This fiddle demonstrates the usage of the css() function to retrieve the rendered font for a div element with an unspecified font face.

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