The way Firefox interprets em values is incorrect

Currently, I am working on an adaptive website where I have used em values for everything. However, I am facing discrepancies between Chrome and Firefox when it comes to interpreting em values. The website can be found at dev.morodeer.ru/stroymoidom and the issue is specifically with the metal bar featuring icons. When the width is around 670px, everything looks great in Chrome, but in Mozilla Firefox, the right edge gets cut off due to the centered wrapper being set to 90% width. Moreover, when both browsers are set to the same width, the metal bar appears smaller in Firefox, leading me to suspect that Firefox is using a smaller font size for calculations.

Answer №1

The units em and ex are dependent on the specific font being used and can vary for each element within a document.

Quoted from: w3.org

It's possible that default fonts are being utilized and that Firefox and Chrome are employing different font choices.

For block layout sizes, I recommend using pixel (px) or percentage (%) values instead of em units.

Em units are best suited for font sizes, with 1em equaling the browser's default font size, 2em being double the default font size, and 0.5em being half the default font size, and so forth.

If you were already aware of this information, it's worth noting that Firefox and Chrome may interpret font sizes differently, impacting how em units affect your font size.

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