offsetWidth varies across different browsers

There seems to be a 1px difference in the value of element.offsetWidth between Firefox and Chrome.

I have been researching this issue. I attempted to apply a CSS reset and moved the element further away from the screen borders (as older versions of IE were inaccurate when within 10px of the border). I came across this explanation suggesting that Firefox requires a setTimeout function, although the reason for this remains unclear...

Unfortunately, I have not found a solution yet. I am hoping to resolve or better understand it using vanilla JavaScript or CSS.

Question:

What is causing this discrepancy, and how can I adjust my CSS to achieve consistent values?

jsFiddle: http://jsfiddle.net/f35j2/show/

html

<div id="wrapper" style="width: 203px; height: 203px;">
    <div id="inner" style="width: 50%; height: 50%; margin: auto; display: block;"></div>
</div>
javascripthtmlcss

Answer №1

The inner element's width is not a whole number, resulting in different rounding methods in FF and Chrome. To obtain the precise width, you can utilize inner.getBoundingClientRect().width (which equals 101.5)

This discrepancy arises from the parent element being 203px, not 202 or 204.

Answer №2

Upon examining your jsfiddle link in both Chrome and Firefox, I discovered the following:

  • Both browsers (Firefox and Chrome) calculate the height and width values for #inner as 101.5px
  • When rendering the element, Firefox rounds down fractional values resulting in a drawn height and width of 101px.
  • Chrome, on the other hand, rounds to the nearest integer for height. Values between 100.5 and 101.4999 are rounded down to 101, while values between 101.5 and 102.4999 are rounded up to 102.
  • For width, Chrome only uses round down calculation. Any value from 101 to 101.9999 is treated as 101.

Take a look at the snapshot below. Try experimenting with boundary values like 101.4999 and 101.9999 for a better understanding.

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