Opposite horizontal margin constraint. A left float box that has another left float box to its left may not have its right margin edge to the right of the containing block's right padding edge.
对立水平边框限制：如果一个左浮动框的左边还有另一个左浮动框，那么这个左浮动框的右marginedge不能在此包含块的右padding edge 之右。
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。
Right - Increase the generated box's top margin so that the top border edge is below the bottom margin edge of any right float boxes generated from previous source elements.
right -增加所生成框的上边框，以便上borderedge处于由之前的源元素所生成的任一右浮动框的底margin edge之下。
In this format each typed element - except the date and the signature block - begins at the left-hand margin. The date may be backspaced from the right margin point to align at the right margin;
这种格式下，书信的排版，除了日期和签名部分，都从左边空白处开始，没有空格，段段之间空行。
In this format each typed element - except the date and the signature block - begins at the left-hand margin. The date may be backspaced from the right margin point to align at the right margin;
这种格式下，书信的排版，除了日期和签名部分，都从左边空白处开始，没有空格，段段之间空行。
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