![]() So, by setting position:relative for an element you make it the containing block for any absolutely positioned descendant (child elements), whether they appear immediately below the relatively positioned element in the hierarchy, or further down the hierarchy. ![]() By “positioned” we mean an element whose position property is set to relative, absolute or fixed-in other words, anything except normal static elements. In this case the containing block is the nearest positioned ancestor. For absolutely positioned elements however it’s a little more complicated. ![]() ![]() For static boxes and relatively positioned boxes the containing block is the nearest block-level ancestor-the parent element in other words. Containing blocksĪn essential concept when it comes to absolute positioning is the containing block: the block box that the position and dimensions of the absolutely positioned box are relative to. In this article we’ll see some practical examples of using both absolute and fixed positioning, look at some browser support quirks, and explore the concept of z-index.īefore all that, though, let’s cover an essential prerequisite concept-containing blocks. Sometimes, of course, this overlap is exactly what you desire, but you should be aware of it, to make sure you are getting the layout you want!įixed positioning is really just a specialized form of absolute positioning elements with fixed positioning are fixed relative to the viewport/browser window rather than the containing element even if the page is scrolled, they stay in exactly the same position inside the browser window. An absolutely positioned element will therefore overlap other content unless you take action to prevent it. That means they have no effect at all on their parent element or on the elements that occur after them in the source code. The first pair of values- static and relative-is closely related, and we looked into those in great detail in the previous article.Ībsolutely positioned elements are removed entirely from the document flow. Now it’s time to turn your attention to the second pair of position property values- absolute and fixed. This article covers absolute and fixed positioning. Advanced layouts with absolute and fixed positioning Summary ![]()
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January 2023
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