:left

:left CSS 伪类, 需要和@规则 @page 配套使用, 对打印文档的左侧页设置CSS样式.

/* 设置打印时的左侧文档样式 */
@page :left {
  margin: 2in 3in;
}

打印文档的"左"或"右"是由书写方向相关的. 举个栗子, "从左到右"的书写方向中第一页应当使用 :right 配置; "从右至左"的书写方向中第一页应当使用 :left 配置.

Note: 并不是所有样式属性都能应用在此选择器内. 仅仅 margin, padding, border, 和 background 等打印时需要的属性可以使用. 其他属性将直接忽略, 并且可以使用的属性也只会在打印时生效, 显示时不会生效.

参数

:left

@page :left {
  margin: 2in 3in;
}

Specification	Status	Comment
CSS Paged Media Module Level 3 :left	Working Draft	No change.
CSS Level 2 (Revision 1) :left	Recommendation	Initial definition.

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
Left-hand page pseudo-class (`:left`)	Chrome Full support 6	Edge Full support 12	Firefox No support No	IE Full support 8	Opera Full support 9.2	Safari Full support 5.1	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android No support No	Opera Android Full support 10.1	Safari iOS Full support 6	Samsung Internet Android Full support 1.0