Inconsistency in div height caused by positioning disparities

My demonstration shows two lines that should appear equal in height, but one ends up looking thicker due to its top position. Even just adjusting the top position by 1px can make a significant difference in how they look. Is there any way to prevent this unexpected behavior?

.a {

  position: absolute;
  top: 0;
}

.line {
  width: 300px;
  height: 1px;
  background: red;
  position: absolute;
  top: 5px;
  box-sizing: border-box;
}

.line2 {
  width: 300px;
  height: 1px;
  background: red;
  position: absolute;
  top: 11px;
  box-sizing: border-box;
}
<div class="a">
  <div class="line"></div>
  <div class="line2"></div>
</div>

htmlcss

Answer №1

Upon examining my screen, I have noticed that the issue arises when the calculated height is slightly off by a fraction of a pixel, causing it to render as 2 physical pixels high at times. Adjusting the height by just 1px resolves this problem.

To create a 1px solid line, you can set the height to 0px and use border-bottom instead.

.a {

  position: absolute;
  top: 0;
  height:11px;
}

.line {
  width: 300px;
  height: 0px;
  background: none;
  border-bottom: 1px solid red;
  position: absolute;
  top: 6px;
  box-sizing: border-box;
}

.line2 {
  width: 300px;
  height: 0px;
  background: none;
  border-bottom:1px solid red;
  position: absolute;
  top: 11px;
  box-sizing: border-box;
}
<div class="a">
  <div class="line"></div>
  <div class="line2"></div>
</div>

Answer №2

While the site functions properly on Chrome, there seems to be an issue on Firefox without any clear explanation. The main problem lies in the fact that both the HTML and Body elements have zero height values. To rectify this, it is crucial to assign appropriate heights to them. A simple way to test this is by manually setting a minimum parent height of at least 2 pixels. Once implemented, the issue should be resolved successfully.

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