What are the characteristics of fixed positioned elements?

The characteristics of fixed positioning elements include positioning relative to the browser window, being separated from the document flow, fixed element position, elements that do not scroll with the scrolling of the page, offsets, element levels, etc. can be set. Detailed description: 1. Positioned relative to the browser window, the position of the element will not change even if the page is scrolled; 2. Out of the document flow, fixed positioning elements can float on the page, covering other elements; 3. The position of the element is fixed, so that Fixed positioned elements are great for creating navigation bars, sidebars, or other elements that are fixed to a certain location on the page, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Fixed positioning is a common positioning method in CSS, which allows us to position elements relative to the browser window without being affected by scrolling. The following are the characteristics of fixed-positioned elements:

Positioned relative to the browser window:

Fixed-positioned elements are positioned relative to the browser window, not the document other elements in the stream. This means that even if the page scrolls, the position of the element will not change.

Detached from the document flow:

Fixed positioned elements will be detached from the document flow and will not affect the layout of other elements. This allows fixedly positioned elements to float on the page, covering other elements.

Fixed element position:

The position of a fixed-positioned element is fixed. No matter how the page is scrolled, the element will remain at the specified position. This makes fixed positioned elements ideal for creating navigation bars, sidebars, or other elements that are fixed to a certain location on the page.

Elements do not scroll as the page scrolls:

Fixed positioned elements do not scroll as the page scrolls. This means that fixed positioned elements will remain in the same position on the page even if the user scrolls the page. This is useful for creating fixed toolbars, advertising columns, or other elements that need to remain visible.

Offset can be set:

Fixed positioning elements can adjust their position in the browser window by setting the top, bottom, left and right attributes. This allows us to position fixedly positioned elements to a specified location, or set a fixed offset.

Element level:

The level of fixed positioning elements can be controlled through the z-index attribute. This allows us to place fixed positioned elements above or below other elements to achieve different coverage effects.

It should be noted that fixed positioning elements may behave differently on mobile devices. In some cases, fixedly positioned elements may scroll as the page scrolls, or create a stuttering effect as the user scrolls.

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