Can I use Ems instead of pixels for Chrome developer tools?

In all my style-sheets, I opt for using ems instead of px. However, in Chrome Developer Tools, the computed styles/metrics always display in px, even for elements where I specifically used ems:

(Here is a screenshot of the computed lengths for a button with an icon from Font Awesome. I specified the padding as 0.4em and wanted to see how tall the icon is.) While I can manually convert by dividing by 16, it's trickier with numbers like "14.841". Is there a way to change the default length measurement unit? (Similar to desktop graphics software where you can switch between pixels, points, inches, or centimeters?) Alternatively, is there a feature within the dev tools that displays lengths in ems? (Perhaps the rulers, ...?)

Answer №1

The values displayed on the Computed tab are calculated and shown in absolute length units like pixels, as opposed to relative length units such as ems, rems, or percentages which derive their size from other factors. For example, if you specify a width of 100% for an element, it will provide you with the pixel equivalent of that width without the option to view it in any other unit. Additionally, when using ems, the size of your icon will be determined by the font-size value inherited.

Although not confirmed through testing, it is believed that the px values presented on the computed tab actually represent device pixels rather than CSS pixels, since CSS pixels themselves are considered relative length units based on the DPI of the screen.

Learn more about Relative Length Units

Discover Absolute Length Units

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