Chrome's rendering of CSS flex display shows variations with identical flex items

I am facing an issue with my flex items where some of them are displaying incorrectly in Chrome but fine in Firefox. The problem seems to be with the margin-right of the rectangle span within each flex item, along with the scaling of the text span due to font-size limitations in browsers like Chrome.

#flex-container {
  display: flex;
  width: 50px;
}

.flex-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  align-content: space-around;
  margin-right: 2.1875px;
  position: relative;
  height: 7px;
}

.rect {
  width: 5px;
  height: 5px;
  display: inline-block;
  background: rgb(6, 74, 105);
  margin-right: 0.875px;
}

.text {
  position: relative;
  font-size: 12px;
  display: inline-block;
  vertical-align: middle;
  transform: scale(0.5);
  transform-origin: left center;
  width: 20.5px;
}
<div id="flex-container">
  <div class="flex-item">
    <span class="rect"></span>
    <span class="text">Mazda</span>
  </div>
  <div class="flex-item">
    <span class="rect"></span>
    <span class="text">Mazda</span>
  </div>
  <div class="flex-item">
    <span class="rect"></span>
    <span class="text">Mazda</span>
  </div>
  <div class="flex-item">
    <span class="rect"></span>
    <span class="text">Mazda</span>
  </div>
  <div class="flex-item">
    <span class="rect"></span>
    <span class="text">Mazda</span>
  </div>
</div>

The code snippet produces the correct result, however, the issue arises when running it on https://jsfiddle.net/xgahLv3k/1/

Refer to the demo image image, where the second item's rectangle is missing the margin-right styling.

Can you suggest a fix for this problem? Thank you!

javascripthtmlcsslayoutflexbox

Answer №1

Each browser has its own way of calculating space, leading to slight discrepancies when dealing with fractions of pixels. Factors like the use of flex or scale transitions can further complicate these calculations.

To avoid these issues, it's best to stick to using full pixels. Pixels are the smallest unit for screen display, so fractions of pixels can cause the browser to make adjustments to accommodate such values.

In the code snippet below, the .flex-item and .rect classes are set in whole pixels:

.flex-item {
  margin-right: 2px;
  /* rest of CSS */
}

.rect {
  margin-right: 1px;
  /* rest of CSS */
}

The original values were 2.1875px + 0.875px which now adds up to a total of 3px for better accuracy.

Updated Snippet:

#flex-container {
  display: flex;
  width: 50px;
}

.flex-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  align-content: space-around;
  margin-right: 2px;
  position: relative;
  height: 7px;
}

.rect {
  width: 5px;
  height: 5px;
  display: inline-block;
  background: rgb(6, 74, 105);
  margin-right: 1px;
}
.text {
  position: relative;
  font-size: 12px;
  display: inline-block;
  vertical-align: middle;
  transform: scale(0.5);
  transform-origin: left center;
  width: 20px;
}
<div id="flex-container">
    <div class="flex-item">
      <span class="rect"></span>
      <span class="text">Mazda</span>
    </div>
    <div class="flex-item">
      <span class="rect"></span>
      <span class="text">Mazda</span>
    </div>
    <div class="flex-item">
      <span class="rect"></span>
      <span class="text">Mazda</span>
    </div>
    <div class="flex-item">
      <span class="rect"></span>
      <span class="text">Mazda</span>
    </div>
    <div class="flex-item">
      <span class="rect"></span>
      <span class="text">Mazda</span>
    </div>
  </div>

Answer №2

From my understanding, pixels represent the smallest increment that can be utilized in design. When using values less than 1 pixel, browsers tend to round them to either 0px or 1px based on their rounding algorithms. In this scenario, the rect class has a margin-right value smaller than 1px. It is recommended to steer clear of using pixel measurements that are less than 1px.

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