Flying wing: Intermediate fixed sides adaptive
Holy Grail layout: two fixed intermediate adaptive
Margin is margins, the digital attribute value is divided into positive and negative numbers.
Positive number: Margin : 20Px ;
Negative: in static (normal flow) elements margin-left negative current element go left margin-top negative current element go up
Margin-bottom after negative current element fixed to go up behind the element, margin-right negative current element does not move to the left to go back element
Noted, margin increased negative current element will be wide (if not set the current element width ) scenario
In the float under
Margin is negative is our common Flying wing, the Holy Grail layout
Adaptive intermediate fixed at both ends
To the element margin-left to go left negative current element, margin-right to left to go negative after an element overwrites the current element.
In the absolute case
Margin is negative
Let the middle elements, provided that know the width and height of the element.
div{
Position：absolute；
Left：50%；
Top：50%；
Margin-left:-width/2;
Margin-top:-height/2
}
Margin is negative no matter what the conditions are releasing their own space, their own if the margin is not enough, put his wide high contribution out.