Why Elements with display: none Cannot Trigger CSS Transitions or Animations
When an element has display: none, it is completely removed from the layout and rendering tree. Because it doesn’t exist in the visual flow, it cannot participate in CSS transitions or animations. CSS transitions require a rendered element whose properties can change over time.
Elements with
display: noneare not rendered, so transition and animation effects cannot be calculated or displayed.If you change an element’s
displayfromnoneto another value (likeblock), the element simply appears instantly—no transition occurs.Properties such as
opacityorvisibilitycan be used instead to animate hiding or showing effects smoothly.
In this example, the element fades in and out smoothly using opacity, because the element remains in the render tree. If display: none were used instead, the element would disappear instantly without any animation.
Use
opacityorvisibilityfor smooth transitions between visible and hidden states.Avoid toggling
displaydirectly in animations; use it after the animation completes (e.g., via JavaScript event listeners).If you need to fully remove an element from layout after a fade-out animation, use JavaScript to set
display: noneonce the transition ends.