Parent or Window: What\'s the Difference in Fixed Element Positioning?

Positioning Elements Fixed Relative to Parent or Window

It's important to understand the difference between positioning an element fixed relative to its parent and positioning it fixed relative to the window.

Positioning Fixed Relative to Parent

To position an element fixed relative to its parent, use the position: absolute property on the child element and set a non-default position mode on the parent element. This allows the child element to be positioned relative to the parent's position,而不是浏览器窗口。

For example:

#parent {
  position: relative;
}

#child {
  position: absolute;
  left: 50px;
  top: 20px;
}

In this case, the #child element will be positioned 50px to the left and 20px below the #parent element.

Positioning Fixed Relative to Window

To position an element fixed relative to the window, use the position: fixed property. This allows the element to be positioned relative to the browser window, regardless of the position of its parent element.

For example:

#floating-element {
  position: fixed;
  bottom: 40px;
  right: 40px;
}

In this case, the #floating-element element will be positioned 40px from the bottom and 40px from the right edge of the browser window.

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