Summary of position attribute_html/css_WEB-ITnose
The position attribute specifies the positioning type of the element
This attribute defines the positioning mechanism used to establish the layout of the element. Any element can be positioned, but absolute or fixed elements generate a block-level box, regardless of the type of the element itself. A relatively positioned element is offset from its default position in normal flow.
| absolute Absolute positioning |
The position of the element is specified through the "left", "top", "right" and "bottom" attributes.
| ||||||||||
| fixed Fixed positioning | Generate absolutely positioned elements, positioned relative to the browser window. The position of the element is specified through the "left", "top", "right" and "bottom" attributes.
| ||||||||||
| relative Relative positioning | Generates a relatively positioned element, positioned relative to its normal position. So "left:20" adds 20 pixels to the element's LEFT position.
| ||||||||||
| static | Default value. Without positioning, the element appears in normal flow (ignoring top, bottom, left, right or z-index declarations). | ||||||||||
| inherit | Specifies that the value of the position attribute should be inherited from the parent element. |
The above is excerpted from W3C’s definition of position
After trying and searching for information, I summarized the following points:
1. static, inherit: Well, I happily decided to ignore it. Come on (sweat!!!);
<html> <head> <style type="text/css"> .div1{ position: relative; border: 10px solid red; padding: 10px; width: 100px; height: 100px; background-color: green; background-clip: content-box; } .div2{ positon: absolute; width: 50px; height: 50px; background-color: yellow; left: 10px;//此处left会以padding开始定位 } </style> </head> <body> <div class='div1'>div1 <div class='div2'>div2</div> </div> </body></html>3. relative: positioned relative to the normal flow ; (Depends on the normal position of the element itself)
4. Absolute: Positioning relative to the first parent element whose position attribute is not static (it’s really a twist, this is something I didn’t grasp at the beginning. If There is no position attribute in the parent element, or the position attributes are all static, which will rely on body positioning)
Of course, there are four diamonds in the box model: content, padding, border, and margin. Keep in mind that absolute will position
based on content adding (that is, the position where padding starts). Rendering:
1 <html> 2 <head> 3 <style type="text/css"> 4 .div1{ 5 position: relative; 6 border: 10px solid red; 7 padding: 10px; 8 width: 100px; 9 height: 100px;10 background-color: green;11 background-clip: content-box;12 }13 14 .div2{15 positon: absolute;16 width: 50px;17 height: 50px;18 background-color: yellow;19 margin: 10px;20 }21 </style>22 </head>23 24 <body>25 <div class='div1'>div126 <div class='div2'>div2</div>27 </div>28 </body>29 </html>
A pitfall was discovered during the experiment! ! ! ! ! ! What will be the effect if left is changed to margin in the above code?
Although only one attribute has been changed, please attach the code:
Still the rendering:
The margin attribute is based on the content of the parent element.
Hmm, don’t be fooled next time.
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