css-position | 易学教程

Difference between style = “position:absolute” and style = “position:relative”

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问题 Can any one tell me the Difference between style = \"position:absolute\" and style = \"position:relative\" and how they differ in case I add it to div / span / input elements? I am using absolute right now, but I want to explore relative as well. How will this change the positioning? 回答1: Absolute positioning means that the element is taken completely out of the normal flow of the page layout. As far as the rest of the elements on the page are concerned, the absolutely positioned element

Understanding z-index stacking order

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问题 I am a little confused about using z-index to decide stack order. I do not quite understand how browsers treat elements with the position property in conjunction to those without it. Is there a general rule to decide the stack order of elements whether it has explicitly positioned elements or not? Examples of different situations are appreciated. Generally speaking: mixed sibling <div> s with position set and without position set. nested <div> s mixed with sibling <div> s with position set

Why do absolute elements stack up on each other instead of stacking one after the other?

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问题 How can get both #row1 and #row2 in the following code to be visible, one after the other vertically, as if there wasn\'t any absolute/relative positioning involved? <body> <div class=\"container\"> <div id=\"row1\" class=\"row\"> <div class=\"col1\">Hello</div> <div class=\"col2\">World</div> </div> <div id=\"row2\" class=\"row\"> <div class=\"col1\">Salut</div> <div class=\"col2\">le monde</div> </div> </div> body {position:relative;} .container {position:absolute;} .row {position:relative;

Make div stay at bottom of page's content all the time even when there are scrollbars

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问题 CSS Push Div to bottom of page Please look at that link, I want the opposite: When the content overflows to the scrollbars, I want my footer to be always at the complete bottom of the page, like Stack Overflow. I have a div with id=\"footer\" and this CSS: #footer { position: absolute; bottom: 30px; width: 100%; } But all it does is go to the bottom of the viewport, and stays there even if you scroll down, so it is no longer at the bottom. Image: Sorry if not clarified, I don\'t want it to be

'transform3d' not working with position: fixed children

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问题 I have a situation where, in normal CSS circumstances, a fixed div would be positioned exactly where it is specified ( top:0px , left:0px ). This does not seem to be respected if I have a parent that has a translate3d transform. Am I not seeing something? I have tried other webkit-transform like style and transform origin options but had no luck. I have attached a JSFiddle with an example where I would have expected the yellow box be at the top corner of the page rather than inside of the

Fixed position but relative to container

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问题 I am trying to fix a div so it always sticks to the top of the screen, using: position: fixed; top: 0px; right: 0px; However, the div is inside a centered container. When I use position:fixed it fixes the div relative to the browser window, such as it\'s up against the right side of the browser. Instead, it should be fixed relative to the container. I know that position:absolute can be used to fix an element relative to the div , but when you scroll down the page the element vanishes and

How to center absolutely positioned element in div?

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问题 I need to place a div (with position:absolute; ) element in the center of my window. But I am having problems doing so, because the width is unknown . I tried this. But it needs to be adjusted as the width is responsive. .center { left: 50%; bottom:5px; } Any ideas? 回答1: <body> <div style="position: absolute; left: 50%;"> <div style="position: relative; left: -50%; border: dotted red 1px;"> I am some centered shrink-to-fit content! <br /> tum te tum </div> </div> </body> 回答2: This works for

How to center a “position: absolute” element

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问题 I\'m having a problem centering an element that has the attribute position set to absolute . Does anyone know why the images are not centered? body { text-align: center; } #slideshowWrapper { margin-top: 50px; text-align: center; } ul#slideshow { list-style: none; position: relative; margin: auto; } ul#slideshow li { position: absolute; } ul#slideshow li img { border: 1px solid #ccc; padding: 4px; height: 450px; } <body> <div id=\"slideshowWrapper\"> <ul id=\"slideshow\"> <li><img src=\"img

Why can't an element with a z-index value cover its child?

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问题 Today, after four hours of debugging, I learned this rule the hard way: A parent element is never able to cover (stack on top of) its child element if the parent has a z-index of any value, no matter how you change the child\'s CSS How can I understand this behavior by logic? Where is this covered in the specification? Code (also in a CodePen): .container { width: 600px; height: 600px; background-color: salmon; position: relative; z-index: 99; margin-top: 20px; padding-top: 10px; } h1 {