How Can I Accurately Retrieve and Adjust Font Size in HTML?

Retrieving Font Size in HTML

Getting the font size of an HTML element can seem like a straightforward task. However, simply accessing the style.fontSize property may not always yield the desired result, especially if the font size is defined in an external stylesheet.

To obtain an accurate font size value, utilize the window.getComputedStyle() method. This function calculates the effective style of an element, including any styles inherited from its ancestors. Here's an example:

var el = document.getElementById('foo');
var style = window.getComputedStyle(el, null).getPropertyValue('font-size');
var fontSize = parseFloat(style);

This code fetches the calculated font size of the element with the ID "foo" and stores it in the fontSize variable. Now you have access to the actual font size value.

Using this approach, you can implement dynamic font size adjustments. For instance:

el.style.fontSize = (fontSize + 1) + 'px';

This line of code increments the font size of the "foo" element by one step. You can replace "1" with any desired value to change the font size as needed.

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