# Converting read values in JavaScript

The `getComputedStyles` function doesn't obtain exactly the values that were set in the CSS. It converts them to absolute values, usually pixels.

Let's look at an example. Let's set the width as a percentage:

`#elem { width: 100%; }`

However, when reading the width, we will get the value not in percentage, but in pixels:

`console.log(computedStyle.width); // the value in px`

The element has the following styles:

`#elem { font-size: 2em; }`

Display the element's font size on button click.

← →
↑
en ru