Relative positioning (relative) means: objects cannot be stacked, and their positions are offset in the normal document flow based on left, right, top, bottom and other attributes. You can also use z-index hierarchical design.
Extended knowledge:
Absolute positioning (absolute) means: drag the object assigned this positioning method out of the document flow, use left, right, top , bottom and other attributes are absolutely positioned relative to its closest parent object with the most positioning settings. If the parent of the object does not set positioning attributes, it still follows HTML positioning rules.
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