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128. Explain how position:sticky works

Position:sticky is a CSS property that combines the behavior of position:relative and position:fixed. In other words, it allows an element to stick to a specified position on the viewport when the page is scrolled.

When an element with position:sticky is scrolled out of view, it remains attached to the viewport until another boundary position is reached. This behavior is similar to position:fixed, but instead of being fixed at a specific position in the viewport, the element sticks to its defined position relative to its parent element.

Here's a brief overview of how position:sticky works:

  1. The element is initially rendered in its normal position, and its position is determined by its parent element.
  2. When the element reaches a defined scroll position (specified by the top, bottom, left, or right properties), it switches from relative positioning to fixed positioning.
  3. The element remains in its fixed position until it encounters another boundary, such as the end of its parent element or the bottom of the viewport.
  4. When the boundary is reached, the element returns to its original position and continues to scroll with the rest of the content.

This behavior can be used to create sticky headers, footers, sidebars, or any other element that needs to stay visible on the screen while the user scrolls. By using position:sticky, you can create a more dynamic and visually appealing interface that responds to the user's actions.