Analysis of three positioning schemes in CSS 2.1_html/css_WEB-ITnose

Normal flow (NormalFlow Float must be positioned AbsolutPosit 1. What is block formatting context With the above knowledge, you can introduce Blockformatcontext block formatting context) Created the BlockFormatContext element , its child elements will be placed one after another. The vertical starting point is the top of a containing block, and the vertical distance between two adjacent elements depends on the 'margin' property. The straight margins of adjacent block-level elements in BlockFormatContext will collapse (collaps throotelementorsomeththatcontainitfloatelementwherefloatisnotnoneabsolutpositelementelementwherepositisabsolutorfixinline-blockelementwithdisplay:inline-blocktablcellelementwithdisplay:table-cell,whichisthedefaultforHTMLtablcelltablcaptionelementwithdisplay:table-caption,whichisthedefaultforHTMLtabl captionelwhereoverflowhaavaluotherthanvisiblflexboxelementwithdisplay:flexorinline-flex

2 "overflow" value is not "visible" 4 "table-caption", or "inline-block" 3. BFC use 1BlockFormatContext can prevent margin collapsing (margincollaps *{margin:0;}body{width:100px ;}#one,#two{width:100px;height:100px;margin:10px;}#one{background:red;}#two{background:blue;}style> ="" The running results are as follows: You can see the upper and lower two The margins of each box are folded. The results are as follows: The margins of the upper and lower boxes are not folded at this time. For example: div><divid. Now for #c1 and #c2 After adding the floatleft feature at the same time, the operating results are as follows: For example: margin:0; } width:100px; background:red; } height:200px; background:yellow; ="" ="" In order to reduce the number of modern browsers and IE&lt. ;8. For questions between At the same time, programmers must be careful when adding styles to the box by triggering the hasLayout method because this method of adding styles may cause that element to become a new block-level formatting context.

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