How to Fix the Overflow: Hidden Bug in Fixed Parent/Child Elements?

Overflow: Hidden Bug in Fixed Parent/Child Elements

When setting overflow: hidden on a fixed parent element, any child elements within it may become visible outside of its boundaries. This occurs due to the way fixed positioning is handled in most browsers.

To address this issue, you can utilize the CSS clip property:

.parent {
  position: fixed;
  overflow: hidden;
  width: 300px;
  height: 300px;
  background: #555;
  clip: rect(0px, 300px, 300px, 0px); /* Clip the parent to its own dimensions */
}

By setting the clip property on the parent element, you define a rectangular area that limits the visible portion of the element and its children.

Considerations:

• Avoid using static or relative positioning for the parent element. Consider using an absolutely positioned parent within a relatively positioned container.
• Percentages are not supported for clip coordinates. Use auto to represent 100%.
• Child element positioning and CSS3 transformations (e.g., scale) may be limited in certain browsers (e.g., IE11 & Chrome34).

To enhance compatibility, consider adding the following styles to the child element:

-webkit-backface-visibility: hidden;
-moz-backface-visibility: hidden;
backface-visibility: hidden;

Browser Compatibility:

• IE8: Menu displayed but links are not clickable
• IE9: Menu not visible if partially below the fold
• iOS Safari <5: Menu not displayed properly
• iOS Safari 5 : Clipped content may repaint on scroll
• FF (13 ), IE10 , Chrome, Chrome for Android: Generally behave as expected

Note that this approach may not be fully supported by older or mobile browsers.

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