Why do I see the relative position on a floating element?

When I put position: relative; on the film class, it floats the scarf to the left, but when I place, position: relative; on the #container it dose not. Why what and why why should I set a position: relative; on a floating element?

< html >

< head >

< meta charset = "UTF-8" >

< title > < / title >

< style >

#container {}

margin: 0 auto;

width: 850px;

}

Wrap {}

height: 140px;

padding: 1em 0;

width: 250px;

float: left;

position: relative;

}

IMG {}

left: 0;

position: absolute;

top: 0;

}

< / style >

< script >

< /script >

< / head >

< body >

< div id = 'hand' >

< div id = "container" >

< div class = "wrap" >

< img src = "images/back.jpg" alt = "image" / > "

< img src = "images/front.jpg" alt = "image" class = "before" / > "

< / div >

< div class = "wrap" >

< img src = "images/back.jpg" alt = "image" / > "

< img src = "images/front.jpg" alt = "image" class = "before" / > "

< / div >

< div class = "wrap" >

< img src = "images/back.jpg" alt = "image" / > "

< img src = "images/front.jpg" alt = "image" class = "before" / > "

< / div >

< / div >

< / div >

< / body >

< / html >

Compensation of absolute and fixed implementation are calculated from the location of the nearest positioned ancestor.  This ancestor could be position: relative | fixed | absolute.  If there is no positioned ancestor, the body tag is used (which is the top left corner of the browser window).  That's why things seem to move when you use the AP elements on pages with content (without a positioned ancestor) centering.  Most people interpret this as part of AP moving to the left, whereas in fact, it's the rest of the content of the page, moving to the right.

So when the parent is placed on an item, it defines the reference zero for the child elements that it contained with?

Yes, but only for the fixed | elements in absolute position.

so is it a good idea to give each element on a page a positioning context, most of the time I think it would be relative. So is it a good idea to give each element on a page a positioning context?

N ° N °

It's a good idea to not use positioning at all unless you absolutely must (pun intended).

Tags: Dreamweaver

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