@page 属性——指定页面盒子的许多方面

@page <page-selector-list> {
<page-body>
}
where
<page-selector-list> = [ <page-selector># ]?
<page-body> = <declaration>? [ ; <page-body> ]? | <page-margin-box> <page-body>
where
<page-selector> = <pseudo-page>+ | <ident> <pseudo-page>*
<page-margin-box> = <page-margin-box-type> {
<declaration-list>
}
where
<pseudo-page> = : [ left | right | first | blank ]
<page-margin-box-type> = @top-left-corner | @top-left | @top-center | @top-right | @top-right-corner | @bottom-left-corner |   @bottom-left | @bottom-center | @bottom-right | @bottom-right-corner | @left-top | @left-middle | @left-bottom | @right-top |   @right-middle | @right-bottom

/* HTML */
<div class="stage">appearance</div>
    
/* CSS */
//规则指定默认页面尺寸是5.5*8.5英尺。如果你想打印一本书。 
@page { size: 5.5in 8.5in; } 

//纸质尺寸关键字
@page { size: A4; } 

//页面方向 - ““portrait””或“landscape” 
@page { size: A4 landscape; }