英文教程:CSS的Float

.clearfix:after {
   content: ".";
   visibility: hidden;
   display: block;
   height: 0;
   clear: both;
}

This will apply a small bit of content, hidden from view, after the parent element which clears the float. This isn’t quite the whole story, as additional code needs to be used to accomodate for older browsers.

Different scenarios call for different float clearning methods. Take for example a grid of blocks, each of different types.



To better visually connect the similar blocks, we want to start a new row as we please, in this case when the color changes. We could use either the overflow or easy clearning method if each of the color groups had a parent element. Or, we use the empty div method in between each group. Three wrapping divs that didn’t previously exist or three after divs that didn’t previously exist. I’ll let you decide which is better.



Problems with Floats

Floats often get beat on for being fragile. The majority of this fragility comes from IE 6 and the slew of float-related bugs it has. As more and more designers are dropping support for IE 6, you may not care, but for the folks that do care here is a quick rundown.

• Pushdown is a symptom of an element inside a floated item being wider than the float itself (typically an image). Most browsers will render the image outside the float, but not have the part sticking out affect other layout. IE will expand the float to contain the image, often drastically affecting layout. A common example is an image sticking out of the main content push the sidebar down below.

  

  Quick fix: Make sure you don’t have any images th