Opacity:0 vs. Visibility:hidden: What's the Real Difference?

Understanding the Distinction between Opacity:0 and Visibility:Hidden

The CSS properties "opacity:0" and "visibility:hidden" serve distinct purposes despite their seemingly similar effect of making elements invisible. While both properties render elements invisible, they exhibit key differences in their behavior:

• Space Occupation:
  "Visibility:hidden" collapses the space occupied by an element, creating a gap in the layout. In contrast, "opacity:0" preserves the element's space, ensuring that surrounding elements adjust accordingly.
• Responsiveness to Events:
  Elements with "visibility:hidden" can still trigger events like clicks and keypresses, unlike elements with "opacity:0." This distinction allows users to interact with invisible elements through assistive technologies.
• Tab Traversal:
  Elements with "visibility:hidden" participate in the tab order, allowing users to navigate between them using the tab key. Conversely, elements with "opacity:0" are skipped, preventing accidental tab navigation.

In summary, "opacity:0" and "visibility:hidden" are distinct properties with unique effects:

Property	Space Collapse	Events	Tab Order
opacity:0	False	Yes	Yes
visibility:hidden	True	No	No

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