XHTML and CSS

A box model of IE browser

IE6 and IE7 must join this line

<! Doctype HTML public "-// W3C // dtd xhtml 1.0 strict // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" >

In this way, the IE browser can display XHTML in a standard box model.Code, That is, width is the content width that does not contain padding and border.

Otherwise, when the width value is specified for a container, the width includes padding and border.

 

2. relative and absolute positioning

Many people think that relative positioning is used together with margin. Absolute positioning is used together with left and top. In fact, it is not.

To learn about CSS positioning, you must first understand what is an HTML document stream.

To understand what a document stream is, you must understand what a block element is and what an inline element is.