default level margin 违约杠杆边际
The visible class just sets the left margin of the optional panel and doesn't need any other Settings because the HTML table is displayed by default.
visible类仅设置可选面板的左侧边界,不需要任何其他设置,因为默认显示HTML表格。
Surprisingly, last does not force a clear to reposition any elements that follow; it merely sets the right margin to 0, which overrides the default right margin of 10 pixels in span-n.
令人惊讶的是,last并未明确强制重新配置其后的任何元素;它仅仅将右边距设置为0,这将覆盖span - n中10像素的默认右边距设置。
This makes the sidebar disappear and instructs the browser to use whatever the margin settings are by default for the printer.
这使得工具条消失了,指示浏览器使用任何的默认给打印机的页边空白设置。
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